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Formation method of high-low temperature lithium ion battery

A technology of lithium-ion battery and formation method, which is applied in the field of high-low temperature lithium-ion battery formation, can solve the problems of poor low-temperature performance and achieve the effects of improving high-temperature performance, improving compatibility, and good co-solubility

Active Publication Date: 2020-06-12
ZHANGZHOU HUARUI PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Facing the current complex battery use environment, batteries are often used alternately at high temperature and low temperature, and the current additives are mostly divided into high temperature additives and low temperature additives. Lithium-ion batteries suitable for high temperature use often have poor low temperature performance, and vice versa. However, therefore, it is necessary to study a new battery that can perform well in both high temperature and low temperature environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Put the assembled battery cell into the battery case, and then inject the electrolyte. The content of methylene methyl disulfonate (MMDS) is 2.2% by volume, and the content of vinyl ethylene carbonate (VEC) is 1.8% by volume; the content of phenylsulfone (PS) is 0.8% by volume, and let stand for 2h;

[0028] 2) 0.01C constant current charging to 4.30V;

[0029] 3) Lower the battery temperature to -5°C;

[0030] 4) Between 4.30V and 4.10V with 0.01C constant current charge and discharge cycle 5 times;

[0031] 5) Discharge at 0.02C to 2.85V;

[0032] 6) Adjust the battery temperature to 40℃;

[0033] 7) Between 2.85V and 2.70V at 0.01C constant current charge and discharge cycle 5 times;

[0034] 8) Adjust the battery to 25°C and charge and discharge the battery at a constant current of 0.2C between 4.30V and 2.70V for 3 times;

[0035] 9) Vacuum and seal.

Embodiment 2

[0037] 1) Put the assembled battery cell into the battery case, and then inject the electrolyte, the content of methylene methyl disulfonate (MMDS) is 2.4% by volume, and the content of vinyl ethylene carbonate (VEC) is 2.0% by volume; the content of phenylsulfone (PS) is 1% by volume, stand for 2h;

[0038] 2) 0.02C constant current charging to 4.30V;

[0039] 3) Lower the battery temperature to 5°C;

[0040] 4) 5 cycles of charging and discharging at a constant current of 0.02C between 4.30V and 4.15V;

[0041] 5) Discharge at 0.02C to 2.95V;

[0042] 6) Adjust the battery temperature to 50°C;

[0043] 7) 5 cycles of charging and discharging at a constant current of 0.02C between 2.95V and 2.70V;

[0044] 8) Adjust the battery to 25°C, and charge and discharge at a constant current of 0.2C between 4.30V and 2.70V for 3 times;

[0045] 9) Vacuum and seal.

Embodiment 3

[0047] 1) Put the assembled battery cell into the battery case, and then inject the electrolyte. The content of methylene methyl disulfonate (MMDS) is 2.3% by volume, and the content of vinyl ethylene carbonate (VEC) is 1.9% by volume; the content of phenylsulfone (PS) is 0.9% by volume, and let stand for 2h;

[0048] 2) 0.01C constant current charging to 4.30V;

[0049] 3) Lower the battery temperature to 0℃;

[0050] 4) Between 4.30V and 4.10V with 0.01C constant current charge and discharge cycle 5 times;

[0051] 5) Discharge at 0.02C to 2.9V;

[0052] 6) Adjust the battery temperature to 45°C;

[0053] 7) Between 2.9V and 2.70V at 0.02C constant current charge and discharge cycle 5 times;

[0054] 8) Adjust the battery to 25°C, and charge and discharge at a constant current of 0.2C between 4.30V and 2.70V for 3 times;

[0055] 9) Vacuum and seal.

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PUM

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Abstract

The invention provides a formation method of a high-low temperature lithium ion battery. The electrolyte of the lithium ion battery comprises an additive, wherein the additive comprises a combinationof three additives including methylene methyldisulfonate (MMDS), vinylethylene carbonate (VEC) and phenylsulfone (PS), the content of the methylene methyldisulfonate (MMDS) is 2.2-2.4% by volume, andthe content of the vinylethylene carbonate (VEC) is 1.8-2.0% by volume; the content of phenyl sulfone (PS) is 0.8-1% by volume. The formation method comprises a low-temperature formation step and a high-temperature formation step, and the battery obtained by the formation method disclosed by the invention has good high-temperature cycle performance and low-temperature cycle performance.

Description

Technical field [0001] The invention relates to a method for forming a high and low temperature lithium ion battery. Background technique [0002] Faced with the current complex battery environment, batteries are often used alternately at high and low temperatures, and most of the current additives are divided into high temperature additives and low temperature additives. Lithium ion batteries suitable for high temperature use often have poor low temperature performance, and vice versa. Of course, therefore, it is necessary to study a new battery that can have good performance in both high and low temperature environments. Summary of the invention [0003] The present invention provides a method for forming a high and low temperature lithium ion battery. The electrolyte of the lithium ion battery contains additives. The additives include methylene disulfonate (MMDS), ethylene ethylene carbonate (VEC) ) And phenylsulfone (PS), the content of methylene disulfonate (MMDS) is 2.2-2.4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/058H01M2300/0025H01M2300/004Y02E60/10Y02P70/50
Inventor 金妍
Owner ZHANGZHOU HUARUI PHOTOELECTRIC TECH
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