Multi-stage formation method of lithium ion battery

A lithium-ion battery and a chemical formation method are applied in the field of multi-stage chemical formation of lithium-ion batteries to achieve the effects of improving film-forming effect, good film-forming effect and broad industrial application prospects.

Active Publication Date: 2021-01-08
苏州极闪控电信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The formation process of lithium-ion batteries has a great influence on the performance of lithium-ion batteries, but in this field, there is little research in the prior art on the influence of the type and content of additives on the parameters of the formation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 60% of the total volume of the electrolytic solution, the additive in the first electrolytic solution is vinylene carbonate, the volume percentage of vinylene carbonate 12%;

[0029] 2) 0.05C constant current charging to the first predetermined voltage, the first predetermined voltage=3.25+1.68*0.12=3.45V;

[0030] 3) Carry out constant voltage charging at the first predetermined voltage until the charging current is lower than 0.01C;

[0031] 4) injecting the second electrolytic solution, the second electrolytic solution accounts for 25% of the total volume of the electrolytic solution, the additive in the second electrolytic solution is methyl chloroformate, and the volume percentage of methyl chloroformate is 5%;

[0032] 5) 0.1C constant current charging to the second predetermined voltage, the second predetermined voltage=3.52+1.25*0.05=3.58V;

[0033] 6) Carr...

Embodiment 2

[0039] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 60% of the total volume of the electrolytic solution, the additive in the first electrolytic solution is vinylene carbonate, the volume percentage of vinylene carbonate 16%;

[0040] 2) 0.1C constant current charging to the first predetermined voltage, the first predetermined voltage=3.25+1.68*0.16=3.52V;

[0041] 3) Carry out constant voltage charging at the first predetermined voltage until the charging current is lower than 0.01C;

[0042] 4) Inject the second electrolyte, the second electrolyte accounts for 25% of the total volume of the electrolyte, the additive in the second electrolyte is methyl chloroformate, and the volume percentage of methyl chloroformate is 8%;

[0043] 5) 0.2C constant current charging to the second predetermined voltage, the second predetermined voltage=3.52+1.25*0.08=3.62V;

[0044] 6) Carry out constant voltage charging at the secon...

Embodiment 3

[0050] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 60% of the total volume of the electrolytic solution, the additive in the first electrolytic solution is vinylene carbonate, the volume percentage of vinylene carbonate 14%;

[0051] 2) 0.05C constant current charging to the first predetermined voltage, the first predetermined voltage=3.25+1.68*0.14=3.49V;

[0052] 3) Carry out constant voltage charging at the first predetermined voltage until the charging current is lower than 0.01C;

[0053] 4) Inject the second electrolyte, the second electrolyte accounts for 25% of the total volume of the electrolyte, the additive in the second electrolyte is methyl chloroformate, and the volume percentage of methyl chloroformate is 6%;

[0054] 5) 0.1C constant current charging to the second predetermined voltage, the second predetermined voltage=3.52+1.25*0.07=3.61V;

[0055] 6) Carry out constant voltage charging at the seco...

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PUM

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Abstract

The invention provides a multi-stage formation method of a lithium ion battery. The method comprises the following steps that a first electrolyte is injected into the battery,vinylene carbonate is used as an additive in the first electrolyte,charging is carried out to a first predetermined voltage, and constant-voltage charging is carried out at the first predetermined voltage; a second electrolyte is injected, an additive in the second electrolyte is methyl chloroformate, and constant-voltage charging is carried out under a second preset voltage after charging is carried out to the second preset voltage; a third electrolyte is injected, dimethyl sulfoxide serves as an additive of the third electrolyte, and constant-voltage charging is carried out under third preset voltage after chargingis carried out to reach the third preset voltage. The method is characterized in that the first, second and third predetermined voltages are respectively related to the content of additives in the first, second and third electrolyte solutions; according to the multi-stage formation method, the proper formation voltage can be accurately positioned, and the lithium ion battery with stable performance is obtained.

Description

technical field [0001] The invention relates to a multi-stage forming method of a lithium ion battery. Background technique [0002] The formation process of lithium-ion batteries has a great impact on the performance of lithium-ion batteries, but in this field, there is little research in the prior art on the influence of the type and content of additives on the parameters of the formation process. The researchers of the present invention found that, for different additives and additive content ranges, when the formation voltage satisfies a specific relationship, the formation effect of the battery can be greatly improved. Contents of the invention [0003] The invention provides a multi-stage formation method of a lithium-ion battery. The multi-stage formation method includes: injecting a first electrolyte solution into the battery, the additive in the first electrolyte solution is vinylene carbonate, and charging to the first predetermined After the voltage is charged,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525H01M10/42
CPCH01M10/0525H01M10/446H01M10/4235Y02E60/10
Inventor 陈来宾
Owner 苏州极闪控电信息技术有限公司
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