03-01-2019 дата публикации
Номер: US20190006664A1
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A lithium secondary battery includes a positive electrode, a negative electrode depositing a lithium metal in a charged state, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte containing a nonaqueous solvent and a lithium salt represented by a formula LiB(CHR), where Rs each independently represent F or CF, and m is an integer of 1 to 5. 1. A lithium secondary battery comprising:a positive electrode;a negative electrode on which a lithium metal is deposited in a charged state;a separator disposed between the positive electrode and the negative electrode; and a nonaqueous solvent, and', {'sub': 6', '5-m', 'm', '4', '3, 'a lithium salt represented by a formula LiB(CHR), where Rs each independently represent F or CF, and m is an integer of 1 to 5.'}], 'a nonaqueous electrolyte containing'}2. The lithium secondary battery according to claim 1 , wherein{'sub': 6', '3', '2', '4', '6', '5', '4', '6', '3', '3', '2', '4, 'the lithium salt is at least one selected from the group consisting of LiB(CHF), LiB(CF), and LiB(CH(CF)).'}3. The lithium secondary battery according to claim 1 , whereina concentration of the lithium salt in the nonaqueous electrolyte is 0.01 mol/L or more.4. The lithium secondary battery according to claim 1 , whereinthe negative electrode in a fully discharged state is composed of only a negative electrode current collector not containing a lithium metal.5. The lithium secondary battery according to claim 4 , whereinthe negative electrode current collector includes a copper foil.6. The lithium secondary battery according to claim 1 , wherein{'sub': 6', '2', '3', '2', '2', '2', '5', '2', '2', '2, 'the nonaqueous electrolyte further contains at least one selected from the group consisting of LiPF, LiN(SOCF), LiN(SOCF), LiN(SOF), and lithium salts containing oxalate complexes as anions.'}7. The lithium secondary battery according to claim 1 , whereinthe nonaqueous electrolyte further contains at ...
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