Potassium ion battery positive electrode additive and preparation method and application thereof

The invention provides a potassium ion battery positive electrode additive and a preparation method and application thereof, the potassium ion battery positive electrode additive at least comprises potassium hexafluoroaluminate, and the potassium hexafluoroaluminate has a carbon-coated structure. According to the potassium ion battery positive electrode additive as well as the preparation method and the application thereof, the coulombic efficiency of the first cycle of the potassium ion battery can be made up, and the cycle stability of the potassium ion battery is improved.

Method for cultivating rapidly white potato breeder's seed

Parallel-connection oil level controlled testing device for measuring refrigeration compressor oil circulating rate in online mode

The invention belongs to the field of refrigeration techniques and particularly relates to a parallel-connection oil level controlled testing device for measuring the refrigeration compressor oil circulating rate in an online mode. The testing device comprises an oil separator arranged at an exhaust end of a compressor, wherein an oil outlet end and a refrigerating fluid outlet end are arranged on the oil separator, the refrigerating fluid outlet end is communicated with an air suction port end of the compressor at least through a condenser, a liquid storage device and an evaporator to form a refrigerant circuit, and the oil outlet end is communicate with an air suction oil return port end of the compressor to form an oil circulation circuit. The testing device further comprises a containing portion, wherein the bottom of the cavity of the containing cavity is communicated with the bottom of the cavity of the oil separator to form a communication device structure, a communication portion ...

Lithium ion battery material, battery and manufacturing method thereof

The invention discloses a lithium ion battery material which comprises a positive electrode material and a lithium supplement agent, the positive electrode material comprises lithium manganese iron phosphate and lithium vanadium phosphate, the lithium supplement agent comprises lithium ferrite, and the lithium ion battery material comprises the following components in parts by weight: 93-94.7 parts of the positive electrode material and 1.3-3 parts of the lithium supplement agent. After the lithium manganese iron phosphate LMFP is mixed with the lithium vanadium phosphate LVP with excellent rate capability, low-temperature performance and cycle performance, the problem that the specific capacity, the safety, the rate capability and the low-temperature performance of a traditional lithium ion battery cannot be considered at the same time can be solved; and meanwhile, the lithium supplement agent LFO is introduced, so that the energy density of the battery is further improved.

Combined pump barrel small-diameter oil well pump

The invention relates to a combined pump barrel small-diameter oil well pump. The combined pump barrel small-diameter oil well pump comprises a pump barrel assembly, a plunger assembly and an oil inlet valve assembly, an upper cover, a closed oil outlet valve cover, a traveling valve ball, a traveling valve seat and a plunger centering device are arranged in an oil pipe nipple, the upper cover is in threaded connection with the closed oil outlet valve cover, the traveling valve ball and the traveling valve seat are arranged in the closed oil outlet valve cover, the closed oil outlet valve cover is a quincuncial oil outlet hole structure with guide ribs, the upper end portion of the oil pipe nipple is connected with an oil pipe coupling, the lower end of the oil pipe nipple is connected with an upper pump barrel coupling, a hollow plunger is connected to the lower end of a traveling valve assembly, and a rectangular balance groove is formed in the lower portion of the hollow plunger; the ...

Steam boiler controller

The utility model relates to a steam boiler controller. INCLUDING MCU MODULE, a 4-20 mA input module, an RS232 module, an RS485 module, a pressure input module, a water level input module, a temperature input module, a relay driving module, a display screen, a power supply module used for supplying power, a burner fault detection module, an output contact module, a first line bank, a second line bank, a third line bank, a fourth line bank, a fifth line bank and a sixth line bank are included. The RS232 module, the RS485 module, the pressure input module, the water level input module, the temperature input module, the relay driving module and the burner fault detection module are all electrically connected to the MCU module. According to the steam boiler control system, control, monitoringand alarming of the operation state of the boiler can be achieved, starting-up is not allowed before a fault signal of a combustion engine disappears, and safe operation of the steam boiler is guaranteed ...

Wall heat accumulating type greenhouse

The invention belongs to the improvement of solar greenhouse structure, more particularly relates to a wall heat accumulating type greenhouse comprising a back wall, gable walls at the two sides and a greenhouse consisting of a lighting plastic tent supported by an arch frame. Cuboid regenerators parallel to the back wall are uniformly distributed and arranged at the back side of the back wall; heat conducting pipes extending into soil layer are uniformly distributed and arranged at the two side cavity walls of the regenerators; blast pipes which respectively pass through the back wall to be communicated with the regenerators and are inclined upwards are uniformly distributed and arranged at the lower part of the back wall along the horizontal line; draft fans are arranged at inlets of the blast pipes; air-out pore channels which pass through the back wall to be communicated with the regenerators and are inclined downwards are uniformly distributed and arranged at the upper part of the ...

Wall heat accumulating type greenhouse

The invention belongs to the improvement of solar greenhouse structure, more particularly relates to a wall heat accumulating type greenhouse comprising a back wall, gable walls at the two sides and aThe invention belongs to the improvement of solar greenhouse structure, more particularly relates to a wall heat accumulating type greenhouse comprising a back wall, gable walls at the two sides and aack wall; the back part of the back wall and the regenerators are all covered by the soil layer; and a heat preservation and thermal insulation layer is arranged outside the soil layer. The wall heaback wall; the back part of the back wall and the regenerators are all covered by the soil layer; and a heat preservation and thermal insulation layer is arranged outside the soil layer. The wall heat accumulating type greenhouse not only stores the heat in the greenhouse during the day, but also can reduce the temperature in the greenhouse simultaneously, and can release the stored heat at nightt accumulating ...