METHOD FOR MANUFACTURING NEGATIVE ELECTRODE SLURRY

Hereinafter, the present invention according to the present invention to aid in more detailed as follows.

The specification range and claim defining the terms or word sense and subsequent analysis or a pre-conventional don't be WD, the best method to account for its own invention in the invention most general outline of a term that technical idea of the present invention to appropriately define a predicated principle to meet the interpreted semantics and general outline must substrate.

The specification a term used to described only exemplary in the embodiment used in that, defining the present invention intending to be endured. It is apparent that a single representation of the differently in order not providing language translators, comprising plurality of representation.

In the specification, "comprising", "having disclosed" or the term "having disclosed" such as embodiment feature, numbers, steps, components or a combination of these there is included by not specified, or the number one or more other features, steps, components, or a combination of pre-times the number should not understood to presence or additional possibility.

In the embodiment of the present invention according to the manufacturing method of negative electrode slurry containing one, silicon-based active material, carboxymethylcellulose, styrene - butadiene rubber including number 1 negative electrode slurry containing, and graphite-based active material, conductive material, styrene - butadiene rubber and a carboxylic methyl cellulose including number 2 number step (step 1) cathode slurry tank; and said step (step 2) number 1 prepared by the number 1 and number 2 negative electrode slurry containing a blending in negative electrode slurry containing a; without using a tool.

Hereinafter, the present invention according to each antenna manufacturing method of negative electrode slurry containing a detailed as follows.

In manufacturing method of the present invention according to negative electrode slurry containing a, step 1 silicone-based active material, carboxymethylcellulose, styrene - butadiene rubber including number 1 negative electrode slurry containing, and graphite-based active material, conductive material, styrene - butadiene rubber and a carboxylic methyl cellulose slurry bath cathode including number 2 step number are disclosed.

In the embodiment according to said number 1 negative electrode slurry containing active material can be obtained by including one of the present invention.

Said silicon-based active material Si, SiO_x (0<x<2), Si-a C composite and Si a-Y alloy (wherein, Y is alkali metal, alkaline earth metal, transition metal, 13 group, 14 group element, by elements selected from the group consisting of rare earth elements and combinations thereof) can be at least one selected from the group consisting 1 using. The, said Si is be a crystalline or amorphous.

When said silicon-based active material, partially oxidized silicon-based solvent or a female screw - butadiene rubber with carboxyl group is further increased and carboxymethylcellulose is embedded degradation can be number is billion.

The average particle diameter (D50) 0 said silicon-based active material. 1 micro m to 10 micro m implementation being. If, said silicon-based active material having an average particle diameter of the silicon-based active material Ni greater than 10 micro m if the volume expansion in adhesion between the door number is lowered excessively generated active material can as well.

In the present invention, the particle diameter of the particles of an average particle diameter of 50% particle diameter distribution can be defined reference in particle diameter. In the embodiment according to said particles have an average particle diameter (D50) of the present invention one example, laser the diffraction law (laser diffraction method) for measuring can. The diffraction law submicron (submicron) region than the melting point of said laser generally wherein the degree of from several mm, and results of the degradable and high reproducibility can be achieved.

In the embodiment according to said number 1 of the present invention carboxymethyl cellulose (CMC) with a carboxylic acid can be a negative electrode slurry containing one. Said carboxymethyl cellulose as a thickening number can be, said number of negative electrode slurry containing a cathode slurry including more due to applicability and can be provided to reduce number 1.

In the embodiment according to said number 1 styrene - butadiene rubber (SBR) can be a negative electrode slurry containing a one of the present invention. Said styrene - butadiene rubber as a binder can be, collector negative electrode active material, negative electrode active material or can be imparting adhesion between. Said styrene - butadiene rubber binder may be composed as well as, styrene - butadiene rubber with acrylic binder, acrylic acid, acrylonitrile, isoprene polymer further include disclosed. When tank number 1 negative electrode slurry containing a number, styrene - butadiene rubber binder materials with said materials can be introduced as disapproval.

In the embodiment according to said number 1 negative electrode slurry containing a silicon-based active material in one of the present invention, carboxymethylcellulose, styrene - butadiene rubber 95 to 99:0. 5 to 3. 0:0. 5 to 3. 0 can be the weight ratio.

If, said styrene - butadiene rubber in said weight ratio 3. 0 parts by weight of above, carboxymethylcellulose is 3. 0 parts by weight of the electrode due to excess of excess binder and more number of sidewall of the door number can be as well. Said styrene - butadiene rubber 0. 5 parts by weight of a silicon-based active material does not impart sufficient adhesion amount less than if electrodes or life properties will be degraded under out door can number as well. Said carboxymethylcellulose is 0. 5 parts by weight of number 1 negative electrode slurry containing solids in amount less than if not number as well as the variance of number exists in the can.

In the embodiment according to manufacturing method of negative electrode slurry containing in one of the present invention, the manufacturing method of negative electrode slurry containing a number 1, carboxymethylcellulose and styrene - butadiene rubber mixed with a solvent mixed solution prepared in step number 1 to number bath (step 1a); silicon-based active material slurry mixing tank capacities for the number 1 and number 1 step number (step 1b) cathode; can be a.

Hereinafter, the present invention according to number 1 of negative electrode slurry containing a manufacturing method processes detailed as follows.

Manufacturing method of the present invention according to number 1 negative electrode slurry containing in, step 1a is carboxymethylcellulose and styrene - butadiene rubber mixed with a solvent mixed solution prepared in the step number 1 to number tank are disclosed.

The manufacturing method of the existing method negative electrode slurry containing, carboxymethylcellulose and conductive material, after first mixed active material, styrene - butadiene rubber in vitro sih4. twisted, more solvent in carboxymethylcellulose is first distributed high probability of his number.

However, styrene - butadiene rubber carboxymethylcellulose and first mixing in the present invention, styrene - butadiene rubber then active material time to prevent the silicone solvent distributed respect other.

The, styrene - butadiene rubber and silicon-based active material effective contact surface between the number of processors increases, styrene - butadiene rubber binder serves to better support can be a silicon-based active material. The, even during severe volume change can be a silicon-based active material charge number billion, due to strong adhesive can be prevent from being deflected in a silicon-based active material electrode equal to or less than.

On the other hand, said solvent can be water. Polyvinylidene fluoride (PVDF) when such as conventional binders, N - methyl - 2 - pyrrolidone polyvinylidene fluoride, or a variation of the solution obtained by dissolving a nonaqueous system primarily use organic solvent etc.. However, when an organic solvent, may be explosion door number occurs since most highly volatile solvent, since the number of relatively expensive door been [...] law rise measured number.

However, in the present invention cathode number of styrene - butadiene rubber bath in carboxymethylcellulose dispersed with more number using aqueous binder systems use of price competitiveness because added to improve driving safety can be enhanced.

Said step of mixed foot 1a, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixing device such as four focus mixer is cited. 30 min or performing the styrene butadiene rubber to specifically homo mixer mixing point dispersibility can be preferred.

Manufacturing method of the present invention according to number 1 negative electrode slurry containing a silicon-based active material in step 1b is number 1 number 1 cathode slurry mixing tank capacities for the step number are disclosed.

Said number 1 as well as styrene - butadiene rubber mixture is carboxymethylcellulose included in the disclosed. The, mixture when said number 1 in vitro in a silicon-on-based active material, styrene - butadiene rubber silicone solvent binder distributed respect other. As a result, silicon-based active material and styrene - butadiene rubber effective contact surface between the number of processors increases, even during severe charge volume change number billion can be silicon-based active material, an electrode for a silicon-based active material due to a strong adhesive can be prevented from being in up and equal to or less than.

The, said step of mixed foot 1b, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixer such as a mixing device include the four focus, specifically focus 40 min or to perform four mixer mixing can be enhanced dispersibility point of such particles are preferred.

In the embodiment according to said number 2 of the present invention comprising a graphite-based negative electrode slurry containing one active material can be.

The active material of graphitic said coal tar pitch, petroleum-based pitch, various organic material is material made of amorphous carbon or heat treated, graphite degree of large natural graphite, artificial graphite, carbon black, meso carbon micro beads, such as carbon fiber can be at least one selected from the group consisting 1 using crystalline carbon.

Specifically, can be used with natural graphite and artificial graphite. Said material can be an adhesion improver electrode if the natural graphite, artificial graphite and it decreases the electric signal of the safety can be.

Said average particle diameter (D50) is 10 to 30 micro m active graphitic micro m implementation being. If, having an average particle diameter greater than 30 micro m said graphitic active material is dispersed in the number 2 negative electrode slurry containing a number not number as well as door can, slurry coating through a collector when processability may cause a decrease in disclosed.

In the present invention, the particle diameter of the particles of an average particle diameter of 50% particle diameter distribution can be defined reference in particle diameter. In the embodiment according to said particles have an average particle diameter (D50) of the present invention one example, laser the diffraction law (laser diffraction method) for measuring can. The diffraction law submicron (submicron) region than the melting point of said laser generally wherein the degree of from several mm, and results of the degradable and high reproducibility can be achieved.

In the embodiment according to said number 2 negative electrode slurry containing a conductive material of the present invention one can. Electron transfer between said negative active material by including a conductive material can be on the opposite locking can be a dry etch process. In particular, the conductive material included in the negative electrode slurry containing said number 2 can be better distributed because of graphitic by solvent can be included to further enhance the output characteristic of a cathode.

Said conductive material without chemical change easier to cell number has the specially if the conductive have one, e.g., natural graphite or artificial graphite such as graphite; carbon black, acetylene black, [khey tsien black, channel black, the [su which it sells black, lamp black, thermal black and carbon black; carbon fiber metal fibers and the like conductive fibers; carbon nanotubes such as conductive tube; fluorocarbons, aluminum, nickel powder metal powder; zinc oxide, conductive potassium titanate whisker; conductive metal oxide such as titanium oxide; polyphenylene derivatives such as is used as the conductive material can be.

An average particle diameter of 10 nm to 40 nm (D50) said conductive material the implementation being.

In the embodiment according to said number 2 negative electrode slurry containing one of the present invention can be styrene - butadiene rubber. Said styrene - butadiene rubber as a binder can be, collector negative electrode active material, negative electrode active material or can be imparting adhesion between. Said styrene - butadiene rubber binder may be composed as well as, styrene - butadiene rubber with acrylic binder, acrylic acid, acrylonitrile, isoprene polymer further include disclosed. When tank number 1 negative electrode slurry containing a number, styrene - butadiene rubber binder materials with said materials can be introduced as disapproval.

In the embodiment according to said number 2 negative electrode slurry containing one of the present invention comprising a carboxylic methyl cellulose can be. Said carboxymethyl cellulose as a thickening number can be, due to the number of negative electrode slurry containing a cathode slurry including more number 2 can be provided to reduce and applicability.

In the embodiment according to said number 2 negative electrode slurry containing a positive electrode active material comprises graphite in one of the present invention, carboxymethylcellulose, styrene - butadiene rubber and conductive material 95 to 99:0. 5 to 3. 0:0. 5 to 3. 0:0. 5 to 3. 0 can be the weight ratio.

If, relative to the weight of the entire negative electrode slurry containing said conductive material is number 2 0. 5 parts by weight of thickening number less than if no excess of hepatitis b due to internal electrode, electrode output property is door number can be generated. The entire negative electrode slurry containing said conductive material is number 2 relative to the weight 3. 0 parts by weight of conductive material above its if hereinafter for the variance of undesirable door number can be as well.

In the embodiment according to manufacturing method of negative electrode slurry containing in one of the present invention, the manufacturing method of negative electrode slurry containing a number 2, carboxymethylcellulose and a conductive material mixed with a solvent mixture is added to the step number 2 number bath (step 1c); number 2 (step 1d) mixing of graphitic capacities for the active material; and said graphitic styrene - butadiene rubber mixed active material comprising mixing capacities for the number 2 (step 1e) can be.

Hereinafter, the present invention according to number 2 of negative electrode slurry containing a manufacturing method processes detailed as follows.

Manufacturing method of the present invention according to number 2 negative electrode slurry containing in, step 1c is carboxymethylcellulose and a conductive material mixed with a solvent mixture is added to the step number 2 number tank are disclosed.

Said solvent can be water. Polyvinylidene fluoride (PVDF) when such as conventional binders, N - methyl - 2 - pyrrolidone polyvinylidene fluoride, or a variation of the solution obtained by dissolving a nonaqueous system primarily use organic solvent etc.. However, when an organic solvent, may be explosion door number occurs since most highly volatile solvent, since the number of relatively expensive door been [...] law rise measured number.

However, in the present invention cathode number of styrene - butadiene rubber bath in carboxymethylcellulose dispersed with more number using aqueous binder systems use of price competitiveness because added to improve driving safety can be enhanced.

Said step 1c of mixed foot, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixer such as a mixing device include the four focus, specifically homo mixer 20 min or mixing to increase the dispersion of conductive material is performed to complete a preferred.

Manufacturing method of the present invention according to number 2 negative electrode slurry containing a number 2 in step 1d is mixing of graphitic capacities for the active material are disclosed.

Mixture with conductive material is uniformly distributed over said number 2 is carboxymethylcellulose. The, solvent of graphitic, carboxymethylcellulose and conductive material is with uniform number 2 negative electrode slurry containing a number can be a high pressure liquid coolant.

Said step 1d of mixed foot, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixer such as a mixing device include the four focus, specifically focus to 40 min or four mixer mixing a lithium ion secondary point dispersibility is performed can be preferred.

Manufacturing method of the present invention according to number 2 negative electrode slurry containing a mixed number 2 in step 1e is said styrene - butadiene rubber mixing capacities for the graphitic active material are disclosed.

Mixing said styrene - butadiene rubber, can be enhance adhesion between the positive electrode active material comprises graphite.

Said step 1e of mixed foot, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixer such as a mixing device include the four focus, 20 min or performing the styrene - butadiene rubber to specifically homo mixer mixing the dispersion of other preferred point.

On the other hand, manufacturing method of the present invention according to negative electrode slurry containing in, said number 1 and number 2 in step 1 step 2 is negative electrode slurry containing a negative electrode slurry containing a blending the number produced therewith are disclosed.

Conventional silicon-based active material of negative electrode slurry containing a negative electrode active material with graphite-based active material and manufacturing method using the complex, carboxymethylcellulose and conductive material, after first mixed active material, styrene - butadiene rubber in vitro order satisfactorily.

However, silicon-based solvent in the present invention preferentially for positioning the styrene - butadiene rubber, styrene - butadiene rubber mixing number 1 and negative electrode slurry containing a silicon-based active material, positive electrode active material comprises graphite, conductive material and styrene - butadiene rubber mixing separately number number 2 negative electrode slurry containing a high pressure liquid coolant therein.

In negative electrode slurry containing a styrene - butadiene is preferentially mixed number 1 of silicon based solvent rubber can be distributed, said number 1 and number 2 negative electrode slurry containing a styrene - butadiene rubber mixing step such as 2 negative electrode slurry containing a silicon-based solvent since even still distribution, as a result said negative electrode slurry containing a cathode prepared by the number in using, styrene - butadiene rubber such as silicone-based solvent is also 1 can be distributed. The, Ni of severe volume change is set in silicon-based active material, an electrode for a silicon-based active material in up and because, as a result cathode can exhibit excellent anion.

Said step of mixed foot 2, e.g., ball mill, sand mill, beads mill, roll mill, pigment disperser, brain chest, ultrasonic disperser, homo crab age writing, homo mixer, mixer such as a mixing device include the four focus, specifically homo-mixer to mixing 30 minute or more is performed to further refine the preferred dispersion of slurry that is capable of point.

In the embodiment according to negative electrode slurry containing a manufacturing method of the present invention in one of, said silicon-based active material and weight ratio 1:9 to 3:7 graphitic active implementation being.

If, silicon-based active material exceeds 30% by weight relative to the weight of the entire active material, i.e. of less than 70% by weight active material content of graphitic expansion volume if silicon-based active material life property is door number can be as well.

In the embodiment according to negative electrode slurry containing a manufacturing method of the present invention in one of, said number 1 and number 2 of carboxymethylcellulose of negative electrode slurry containing a negative electrode slurry containing a weight ratio of carboxymethylcellulose 0. 5:9. 5 to implementation being 5:5.

Said carboxymethyl cellulose, in each slurry viscosity and active material, styrene - butadiene rubber, conductive material such as solid minutes is to be uniformly distributed the function. The, number 1 and number 2 each negative electrode slurry containing a negative electrode slurry containing a silicon-based active material and included s402. in proportion to the weight ratio of graphitic materials.

For example, negative electrode slurry containing 10% by weight relative to the weight of the entire active material in silicon-based active material, at a rate of 90% by weight active material contained in the negative electrode slurry containing graphitic if, in negative electrode slurry containing by weight relative to the entire carboxymethylcellulose, carboxymethylcellulose is 10% by weight silicon-based active material included in the negative electrode slurry containing a number 1, 90% by weight of graphitic cathode active material number 2 is carboxymethylcellulose within the slurry contained implementation being.

If, in negative electrode slurry containing by weight relative to the entire carboxymethylcellulose, said number 1 negative electrode slurry containing a weight ratio of carboxymethylcellulose 0. 5% by weight styrene - butadiene rubber in the negative electrode slurry containing a number 1 is less than the variance of the doors of silicon based active material and number as well can be difficult.

In addition, negative electrode slurry containing the entire carboxymethylcellulose in relative to the weight, wherein the weight ratio exceeds 50% by weight said number 1 negative electrode slurry containing a carboxy methyl cellulose, i.e. less than 50% by weight carboxylic acids diplopia methyl [leyl rule five [su number 2 number 2 negative electrode slurry containing a weight ratio of graphitic cathode within the slurry if the variance of lithium secondary battery and conductive material can be difficult door number as well.

In the embodiment according to the manufacturing method of the present invention one cathode, said negative electrode slurry containing a number according to a manufacturing method of applying (step 3) prepared by the negative electrode slurry containing a collector; and said step of step 3 (step 4) applied negative electrode slurry containing a drying and rolling on a current collector; without using a tool.

Hereinafter, the present invention according to manufacturing method of each processes detailed as follows.

In the embodiment of the present invention in manufacturing method according to one of the cathode, the cathode current collector of said negative electrode slurry containing a 3 step applying a slurry prepared by the number according to the manufacturing method are disclosed.

Said collector, the battery without chemical change have specially if the number one has the conductive, e.g., copper, stainless steel, aluminum, nickel, titanium, plastic carbon, or aluminum or stainless steel surface of carbon, nickel, titanium, surface treatment like the like can be used.

After prepare the collector, on a current collector, of the present invention of negative electrode slurry containing a layer formed on a base. At this time, typically, by applying a cathode slurry of the present invention, negative electrode slurry containing a layer formed on a base of. In addition, may be applied to one side of a collector and said negative electrode slurry containing, applied to both sides of a retarder.

Said method applied to a smooth free number, e.g. doctor blade method, dip method, reverse roll method, direct roll method, him expense oh the law, [ik base strategy, such as the brush seven law method is cited.

In addition, the thickness of the film thickness of said negative electrode slurry containing a negative electrode active material can be appropriately set in accordance with the object of a negative.

In the embodiment of the present invention according to one cathode in manufacturing method, step 4 is applied on a current collector of negative electrode slurry containing said step 3 for drying and rolling steps are disclosed.

Said drying process, to dry the coated current collector cathode slurry solvent within the slurry industry process number are disclosed. Drying method include, for example, hot air, hot air, such as an outer low-wind drying; vacuum drying; infrared, far infrared ray or electron beam irradiation-energy line drying is cited. In the embodiment include one specific, 50 °C to 200 °C within 1 be a vacuum oven drying.

said rolling process, a process for increasing adhesion qualities and vicinity of density between collector and active material are disclosed. It mold press or roll press method of rolling to one side the anode active material layer can be a pump embodiment.

In the embodiment according to the cathode is one of the present invention, the cathode can be prepared by the number according to said manufacturing method.

Styrene - butadiene rubber in said cathode of silicon based solvent is distributed to open volume change in silicon-based active material is Ni, the surface of the silicon-based active material in the cathode can be prevent said. The, said cathode capacity anion can exhibit respectively.

In the embodiment according to one secondary battery of the present invention, said number tank manufacturing method cathode according to a cathode, anode, cathode and anode can be interposed between said separation film and an electrolyte.

Said secondary battery, said cathode capacity respectively since anion can exhibit.

said anode has active material particles, including solvent and binder by mixing a conductive material on a current collector assembly includes a sum number anode anodic after applying the drying and by rolling a number bath 1308.

Said collector, the battery without chemical change have specially if the number one has the conductive, e.g., copper, stainless steel, aluminum, nickel, titanium, plastic carbon, or aluminum or stainless steel surface of carbon, nickel, titanium, surface treatment like the like can be used.

Said positive electrode active material lithium cobalt oxide (LiCoO₂ ), Lithium nickel oxide (LiNiO₂ ) Or 1 or more transition metal substituted compounds such as lamellar compound; formula Li_{1 + y} Mn_{2 a-y} O₄ (0 ≤ y ≤ 0. 33), LiMnO₃ , LiMn₂ O₃ , LiMnO₂ Such as lithium manganese oxide; lithium copper oxide (Li₂ CuO₂ ); LiV₃ O₈ , LiFe₃ O₄ , V₂ O₅ , Cu₂ V₂ O₇ Such as vanadium oxide; formula LiNi_{1- Y} M_y O₂ (Wherein, the Co M, Mn, Al, Cu, Fe, Mg, B or Ga and, 0. 01 ≤ y ≤ 0. 3 satisfies other) represented Ni site type lithium nickel oxide; formula LiMn_2-y M_y O₂ (Wherein, the Co M, Ni, Fe, Cr, and Zn or Ta, 0. 01 ≤ y ≤ 0. 1 satisfies the other) or Li₂ Mn₃ MO₈ (Wherein, the Fe M, Co, Ni, Cu or Zn are disclosed.) expressed by a lithium-manganese complex oxide; part of alkaline earth metal ions substituted LiMn formula Li₂ O₄ But as to the, these only and not limited.

Said binder include polyvinylidene fluoride hexafluoropropylene copolymer (PVDF-a co non-HFP) -, polyvinylidene (polyvinylidenefluoride), polyacrylonitrile (polyacrylonitrile), poly polymethylmethacrylate (polymethylmethacrylate), polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene - propylene - diene monomer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluorine rubber, poly acrylic acid (poly acrylic acid) and their hydrogen Li, Na or Ca or the like substituted polymer, or a variety of various classes of binder polymer or copolymer can be used.

Said conductive material without chemical change easier to cell number has the specially if the conductive have one, e.g., natural graphite or artificial graphite such as graphite; carbon black, acetylene black, [khey tsien black, channel black, the [su which it sells black, lamp black, thermal black and carbon black; carbon fiber metal fibers and the like conductive fibers; carbon nanotubes such as conductive tube; fluorocarbons, aluminum, nickel powder metal powder; zinc oxide, conductive potassium titanate whisker; conductive metal oxide such as titanium oxide; polyphenylene derivatives such as is used as the conductive material can be.

Said solvent may be a solvent commonly used in the art,

The bombing death id which it will count (dimethyl sulfoxide, DMSO) dimethyl, isopropyl alcohol (isopropyl alcohol), N - methylpyrrolidone (NMP), acetone (acetone) as to the aromatic hydrocarbon or water and, among these 1 species alone or in combination with at least one 2 can be mixtures.

A plurality of pixels are separating said cathode and an anode of lithium ions to the transfer path number [...], if used without special number patterns as used in a conventional secondary battery which, in particular electrolyte ion migration resistance has an electrolyte preferably mung beans is excellent in the ability. Specifically porous polymer film, e.g. ethylene homopolymers, propylene homopolymer, ethylene/butene copolymers, ethylene/hexene copolymer and ethylene/methacrylate copolymers such as polyolefin polymer or porous polymer film 2 at least one layer of the laminated structure is used number high pressure liquid coolant can be. The conventional porous nonwoven fabric, e.g. high melting glass fiber, non-woven fabric can be used polyethylene terephthalate fibers disapproval. Further, mechanical strength ceramic component or polymer material is included securing unit or coated membranes may be used, optionally can be used as single or multi-layer structure.

Said electrolyte is a liquid electrolyte lithium secondary battery morning fair number available organic, inorganic liquid electrolyte, solid polymer electrolyte, gel-type polymer electrolyte, solid inorganic electrolyte, as to the melt-type inorganic electrolyte can be, and not limited to them.

Specifically, metal plate and said electrolyte is a nonaqueous organic solvent can be.

Said nonaqueous organic solvent, e.g., N - methyl - 2 - pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma - butyl lactone, 1, 2 - dimethoxy ethane, tetra hydroxy franc (franc), 2 - methyl tetrahydrofuran, dimethyl sulfoxide, 1, 3 - [...], formamide, dimethyl formamide, [...], acetonitrile, nitroparaffins, methyl formate, acetic methyl, phosphate triester, trimethoxy methane, [...] derivatives, sulfonyl cancer, cancer methyl sulfonyl, 1, 3 - dimethyl - 2 - imidazolidinone, propylene carbonate derivatives, maleic acid derivatives to tetrahydrofuran derivatives, ether, methyl fatigue the blood it comes it buys, such as aprotic organic solvent is used in phenylpropionic acid ethyl can be.

In particular, ethylene carbonate and propylene carbonate during cyclic carbonate methoxy said viscous organic solvent can be preferably used as the high dielectric constant well causes the lithium salt, such as purification of low viscosity and [...] dimethyl cyclic carbonate, low dielectric constant linear carbonate mixed rate to proper electrolyte capable of high electrical conductivity can be used more preferably.

Said lithium salt and metal salts can be used, a non-aqueous electrolyte lithium salt dissolve said said good as, e.g., lithium salt anion include F said^- , Cl^- , I^- , NO₃^- , N (CN)₂^- , BF₄^- , ClO₄^- , PF₆^- , (CF₃ )₂ PF₄^- , (CF₃ )₃ PF₃^- , (CF₃ )₄ PF₂^- , (CF₃ )₅ PF^- , (CF₃ )₆ P^- , CF₃ SO₃^- , CF₃ CF₂ SO₃^- , (CF₃ SO₂ )₂ N^- , (FSO₂ )₂ N^- , CF₃ CF₂ (CF₃ )₂ CO^- , (CF₃ SO₂ )₂ CH^- , (SF₅ )₃ C^- , (CF₃ SO₂ )₃ C^- , CF₃ (CF₂ )₇ SO₃^- , CF₃ CO₂^- , CH₃ CO₂^- , SCN^- And (CF₃ CF₂ SO₂ )₂ N^- 1 species can be selected from the group consisting of using.

Said electrolyte is said electrolyte components improves the characteristic of PVDF and in addition, battery charging billion number, cell discharge capacity enhancement to the like e.g., halo such as difluoro purification of compounds the alkyl [leyn the car sees [thu orgin, pyridine, tri-ethyl phosphite, high pressure, cyclic ether, ethylenediamine, n - glymes (glyme), process n-alkyl thiophosphoric triamides, nitrobenzene derivatives, sulfur, quinone imine dyes, N - substituted oxazolidinone, N, N - substituted imidazolidine, ethylene glycol dialkyl ether, ammonium salts, pyrrole, 2 - methoxy ethanol or three ammoniums such as aluminum may be filled only addition of at least one number is 1.

Said secondary battery having a portable telephone, notebook computer, portable digital cameras, such as electric vehicle and hybrid electric vehicle (hybrid electric vehicle, HEV) inner neoplasias.

In the embodiment of the present invention according to another, said secondary battery unit cells including battery module and the battery pack including encoded ball number. Said battery module or battery pack is power tool (Power Tool); electric vehicle (Electric Vehicle, EV), hybrid electric vehicle, and a plug-in hybrid electric vehicle (Plug provided in Hybrid Electric Vehicle, PHEV) including an armature; or power storage systems using one or more collected device power can be.

Hereinafter, the present invention is embodiment of the present invention in the embodiment for the person with skill in the art is provided for in the art hereinafter to be detailed as follows. However the present invention refers to several different taught herein can be embodied in the form of a in the embodiment is not limited to.

<In the embodiment 1>

Number cathode tank

Step 1: number of negative electrode slurry containing a number of negative electrode slurry containing a number 1 number 2 bath and bath

Number 1 negative electrode slurry containing a number of bath

An average particle diameter of 200 nm in weight average molecular weight of 800,000 carboxy methyl cellulose in an aqueous solution including 1 wt % styrene - butadiene rubber homo mixer is mixed into. Then, focus to an average particle diameter of 10 micro m said carboxymethylcellulose - butadiene rubber styrene with four mixer on high pressure liquid coolant at a rate of 40 minutes in 1:1 mixing number 1 was a negative electrode slurry containing SiO number.

Number 2 number of negative electrode slurry containing a bath

An average particle diameter of 10 nm in weight average molecular weight of 800,000 carboxy methyl cellulose with an aqueous solution including 1 wt % in a conductive material selected from a high pressure liquid coolant mixed solution was number 2 number homo mixer.

Natural graphite having an average particle diameter (D50) 20 micro m artificial graphite and graphite mixture said number 2 in adding a lithium secondary battery containing, focus 40 minutes to four mixer is mixed. Then, styrene - butadiene rubber of the same capacities for use in negative electrode slurry containing said number 2 number 1 number 2 negative electrode slurry containing a number was added to a high pressure liquid coolant. Said active material, conductive material, carboxymethylcellulose, styrene - butadiene rubber 95:1:2:2 weight ratio of are disclosed.

At this time, the weight ratio of graphitic on said active and said SiO 1:9, said number 1 and number 2 negative electrode slurry containing a cathode within the slurry carboxymethylcellulose in carboxymethylcellulose was the weight ratio of 1:9. Said number 1 styrene - butadiene styrene - butadiene rubber in the negative electrode slurry containing a weight ratio of 1:9 been cellular rubber and number 2 cathode within the slurry.

Step 2: number 1 and number 2 negative electrode slurry containing a negative electrode slurry containing a mixture of

Said number 1 and number 2 cathode slurry by mixing a negative electrode slurry containing a number 30 minutes to negative electrode slurry containing a homo mixer was high pressure liquid coolant.

Step 3: number cathode tank

In said step 2 in an existing copper thin film cathode current collector 20 micro m number prepared by the negative electrode slurry containing a refractive index in the thickness of 100 micro m, 100 °C 3 vacuum oven drying time, 100 °C heated rolls to between 15 mpa pressure by rolling, final thickness (+ collector deposition) in cathode 120 micro m number was high pressure liquid coolant.

Number bath anode

The anode in lithium cobalt composite oxide, carbon black of a conductive material, a high pressure liquid coolant 96:2:2 PVDF binder based on the weight of medium to number after, application 120 °C in an aluminum foil anode collector chain of 130 m thickness was number 3 is dried to anode micro time high pressure liquid coolant.

Number of secondary battery bath

Said number prepared by the anode, cathode and porous polyethylene layer by using stacking (stacking) when the assembling, assembled to an electrolytic cell (purification of the methyl car this [thu which it sees (volume ratio)=1/2 (EC)/ethyl (EMC), lithium process being composed of phosphate (LiPF₆ 1 mole) was injected into a high pressure liquid coolant number a lithium rechargeable battery.

Comparison example 1><

In steps 1 and 2 instead of number prepared by the negative electrode slurry containing said in the embodiment 1, in the range of 0.1 in the embodiment 1 to form a cathode slurry to a host computer in number equal to the number [...] his high pressure liquid coolant and secondary battery.

Negative electrode slurry containing a number bath

An average particle diameter (D50) in SiO micro 10 m, 20 m in average particle diameter (D50) based on the weight of the artificial graphite and natural graphite micro 10:30, high pressure liquid coolant number was a negative electrode active material.

On the other hand, 1 wt % of carboxymethylcellulose solution to 20 minutes homo mixer by mixing a conductive material is mixed. Said negative electrode active material which can focus said mixed solution to 40 minutes four mixer is mixed.

Said cathode active material dispersed styrene - butadiene rubber solution (40% by weight concentration) cast into the mixed solution which can be, homo-mixer to a high pressure liquid coolant mixing negative electrode slurry containing a number was 30 minutes.

Example experiment 1><reading

Said in the embodiment 1 and comparison example 1 in 50 mm at a speed of 300 mm/min to separate said cathode prepared by the number of the base material of the specimen 180° peeling test is performed, the result shown in table 1.

For example anti-alk 2><experiment

In said in the embodiment 1 and comparison example 1 to separate such as secondary battery prepared by the number electron conducting experiments.

Lithium secondary battery-alk has a first cycle is 0. 1C certain interval symmetrically to perform, after cycle is 0. 5C embodiment certain interval symmetrically to him. First cycle discharge capacity ratio of 25 second cycle discharge capacity for a long time.

Figure 2 in the embodiment 1 and comparison example 1 to table 2 and revealing the secret number in anti-alk secondary battery produced therewith are disclosed.

Anti-alk -: (25 second cycle discharge capacity/first cycle discharge capacity) × 100

Of the present invention preferred embodiment of the present invention detailed above but has the rights range is limited to the SFC, basic general outline of the present invention hereinafter defined in the claims of which form various modified and improved in a range of rights using one skilled in addition of the present invention are disclosed.