Liquid injection formation method of power lithium ion battery

A lithium-ion battery and power technology, applied in secondary batteries, battery electrodes, electrochemical generators, etc., can solve the problems of poor battery positive and negative contact, battery bulging safety, increased resistance, etc., and achieve a good electrolyte solution. The effect of stability, reduction of gas production, and low internal resistance

Inactive Publication Date: 2021-01-08
江苏卫健信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The power lithium-ion battery needs to have a stable working ability at high rates, and the power battery has a high operating temperature due to the large current, and at high temperature, the electrolyte is easy to decompose on the battery surface to produce gas, resulting in poor contact between the positive and negative electrodes of the battery. As a result, the resistance increases, and what's more, the battery bulges and causes potential safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) The positive and negative electrodes of the power lithium-ion battery are spaced apart and placed in the first electrolytic solution. In the first electrolytic solution, propylene carbonate is used as the organic solvent, containing 2mol / L lithium hexafluorophosphate, and containing 0.03mol / L of sodium hexafluorophosphate, and containing 1-cyclohexyl-2-pyrrolidone and 1,3-propane sultone as additives, the concentration of 1-cyclohexyl-2-pyrrolidone is 3.5% by volume, 1,3- The concentration of propane sultone is 1.5% by volume;

[0030] 2) Charging with a constant current of 0.2C to a first predetermined voltage, said first predetermined voltage=3.86+2.2*0.035=3.94V;

[0031] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0032] 4) Charging with a constant current of 0.1C to a second predetermined voltage, the second predetermined voltage=4.25V+8.4*0.015=4.38V;

[0033] 5) Constant voltage chargin...

Embodiment 2

[0038] 1) The positive and negative electrodes of the power lithium-ion battery are spaced apart and placed in the first electrolytic solution. In the first electrolytic solution, propylene carbonate is used as an organic solvent, containing 4mol / L lithium hexafluorophosphate, and containing 0.06mol / L of sodium hexafluorophosphate, and containing 1-cyclohexyl-2-pyrrolidone and 1,3-propane sultone as additives, the concentration of 1-cyclohexyl-2-pyrrolidone is 4.5% by volume, 1,3- The concentration of propane sultone is 1.8% by volume;

[0039] 2) Charging with a constant current of 0.5C to a first predetermined voltage, said first predetermined voltage=3.86+2.2*0.045=3.96V;

[0040] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0041] 4) Charging with a constant current of 0.2C to a second predetermined voltage, the second predetermined voltage=4.25V+8.4*0.018=4.40V;

[0042] 5) Constant voltage charging...

Embodiment 3

[0047]1) The positive and negative electrodes of the power lithium-ion battery are spaced apart and placed in the first electrolytic solution. In the first electrolytic solution, propylene carbonate is used as an organic solvent, containing 3mol / L lithium hexafluorophosphate, and containing 0.045mol / L of sodium hexafluorophosphate, and containing 1-cyclohexyl-2-pyrrolidone and 1,3-propane sultone as additives, the concentration of 1-cyclohexyl-2-pyrrolidone is 4% by volume, 1,3- The concentration of propane sultone is 1.6% by volume;

[0048] 2) Charging with a constant current of 0.3C to a first predetermined voltage, said first predetermined voltage=3.86+2.2*0.04=3.95V;

[0049] 3) Constant voltage charging with the first predetermined voltage until the charging current is lower than 0.01C;

[0050] 4) Charging with a constant current of 0.15C to a second predetermined voltage, said second predetermined voltage=4.25V+8.4*0.016=4.38V;

[0051] 5) Constant voltage charging ...

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PUM

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Abstract

The invention provides a liquid injection formation method of a power lithium ion battery. The positive electrode active material of the power lithium ion battery is LiNi0.25Mn0.55Co0.15Nb0.02Ca0.03O2. The liquid injection formation method comprises the following steps: oppositely arranging a positive electrode and a negative electrode of the power lithium ion battery at an interval, putting the power lithium ion battery into a first electrolyte, and pre-forming at high voltage; and assembling into a battery after the pre-formation, injecting a second electrolyte, and then forming. The batteryobtained by the formation method disclosed by the invention has extremely stable working performance when working at high temperature and high magnification, the battery obtained by the formation method disclosed by the invention can inhibit the gas production phenomenon of the battery at high temperature and high current, the battery is prevented from expanding and bulging, the safety performance of the battery is improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to a method for liquid injection and formation of a power lithium ion battery. Background technique [0002] The power lithium-ion battery needs to have a stable working ability at high rates, and the power battery has a high operating temperature due to the large current, and at high temperature, the electrolyte is easy to decompose on the battery surface to produce gas, resulting in poor contact between the positive and negative electrodes of the battery. As a result, the resistance increases, and what's more, the battery bulges and causes potential safety hazards. Contents of the invention [0003] The invention provides a method for liquid injection and formation of a power lithium ion battery, wherein the positive electrode active material of the power lithium ion battery is LiNi 0.25 mn 0.55 co 0.15 Nb 0.02 Ca 0.03 o 2 , the liquid injection forming method includes: placing the positive electrode and the negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0567H01M10/0525H01M10/058H01M4/505H01M4/525H01M4/485
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/058H01M10/446H01M2300/0025Y02E60/10Y02P70/50
Inventor 黄颖
Owner 江苏卫健信息科技有限公司
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