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Method for prolonging circulation life of lithium ion battery with lithium nitride

A lithium-ion battery, cycle life technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor cycle performance, and achieve the effects of small rate performance impact, uniform distribution, and improved cycle life.

Inactive Publication Date: 2019-02-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology

[0004] A method of using lithium nitride to improve the cycle life of lithium-ion batteries proposed by the present invention can solve the technical problem of poor cycle performance of existing lithium-ion batteries

Method used

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  • Method for prolonging circulation life of lithium ion battery with lithium nitride
  • Method for prolonging circulation life of lithium ion battery with lithium nitride
  • Method for prolonging circulation life of lithium ion battery with lithium nitride

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specific Embodiment

[0029] (1) Lithium nitride pretreatment: Weigh 1 kg of lithium nitride in the glove box, grind it fully with an agate mortar, seal it and store it for later use;

[0030] (2) Pulping: Weigh 600g of NMP and 6.7kg of PVDF respectively and put them into a stirring tank, stir in vacuum for 4 hours to make a glue, the dispersion rate is 800r / min, and the temperature is controlled at 20-50°C; the ground lithium nitride powder Add in a stirring tank, stir in vacuum for 8 hours, disperse at a rate of 1000r / min, add NMP to adjust the viscosity to 3000-6000mPa·s;

[0031] (3) Take the ternary positive electrode sheet (the main material is LiNi 0.8 co 0.1 mn 0.1 o 2 ) Use a coating machine to evenly coat the prepared lithium nitride slurry on the surface of the positive electrode sheet, and control the coating surface density to 0.4±0.1g / m 2 (1%), and dried;

[0032] (4) Use a rolling machine to roll the positive electrode sheet, and the thickness after rolling is controlled at 126±...

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Abstract

The invention discloses a method for prolonging the circulation life of a lithium ion battery with lithium nitride and aims to solve the technical problem that a lithium ion battery is poor in circulation performance. The method comprises the following steps: grinding lithium nitride powder material in a glove tank with protection of argon; mixing NMP (N-Methyl Pyrrolidone) with PVDF (Polyvinylidene Fluoride), carrying out vacuum stirring to obtain an adhesive, and controlling the viscosity of the adhesive within 3000-6000mPa*s; adding the grinded lithium nitride powder, and carrying out vacuum stirring; uniformly coating the surface of an anode piece by the prepared lithium nitride slurry by using a coating machine, drying, and grinding; matching with a corresponding cathode piece, and implementing a conventional process, thereby obtaining a battery. The method is simple in preparation process, device requirements can be met by conventional lithium ion battery production equipment, and the method is applicable to industrial production and application; the lithium nitride is distributed on the surface of the anode piece, and the rate capability of the battery is slightly affected;as the lithium nitride is uniformly distributed on the surface of the anode piece, a dense and uniform SEI membrane can be formed; the circulation life of the lithium ion battery after lithium replenishing of lithium nitride can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for improving the cycle life of lithium ion batteries by using lithium nitride. Background technique [0002] With the improvement of living standards, the number of private cars is increasing, the pressure on the environment is increasing day by day, and at the same time, petroleum energy is becoming increasingly exhausted. Most countries, including my country, have begun to develop and use new energy vehicles. Currently, available energy storage methods for new energy vehicles include lithium-ion batteries, flywheel batteries, and hydrogen fuel cells. Among many energy storage methods, lithium-ion batteries are widely used due to their advantages of high energy density and relatively low price. [0003] Pure electric vehicles using lithium-ion batteries have the disadvantage of insufficient cruising range compared with fuel vehicles, and the automotive m...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M10/0585H01M10/0525
CPCH01M4/1391H01M10/0525H01M10/0585H01M2220/20Y02E60/10Y02P70/50
Inventor 金波陈炜张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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