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A kind of open formation method of lithium ion battery

A technology of lithium-ion battery and formation method, which is applied in the field of open formation of lithium-ion batteries, which can solve the problems of gas production rate, electrolyte overflow, poor SEI film formation effect, and battery life, and achieve stable film formation and excellent performance. Stabilizing, quality-enhancing effects

Active Publication Date: 2020-11-06
宇恒电池股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, film-forming agents are often used to promote the formation of SEI. Among them, VC is a negative electrode film-forming agent commonly used in this field, but because the unsaturated bonds of VC are too active, it is easy to over-react during the film-forming process, resulting in the formation of SEI. The membrane effect is not good, or the gas output rate is too high, causing the electrolyte to overflow, thus affecting the battery life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Inject the assembled battery into the first electrolyte, wherein the content of ethylene carbonate VEC is 3 (volume) %, then raise the temperature of the injected battery to 50° C., and let it stand for 1 hour;

[0034] 2) Lower the battery temperature to 10°C, and then charge it to 3.2V at 0.1C;

[0035] 3) Charge with a constant voltage of 3.2V until the charging current is less than 0.01C;

[0036] 4) Stand still for 1 hour, measure the open circuit voltage of the battery, if the open circuit voltage is lower than 3.2V, proceed to step 3, if not, proceed to step 5;

[0037] 5), adjust the battery voltage to 2.7V, and then inject the second electrolyte, wherein the content of vinylene carbonate VC is 6 (volume)%, then raise the temperature of the injected battery to 50°C, and let it stand for 1 hour;

[0038] 6) Lower the battery temperature to 10°C, then charge it to 3.2V at 0.1C;

[0039] 7) Charge with a constant voltage of 3.2V until the charging current is l...

Embodiment 2

[0045] 1) Inject the assembled battery into the first electrolyte, wherein the content of ethylene carbonate VEC is 2 (volume) %, then raise the temperature of the injected battery to 45° C., and let it stand for 1 hour;

[0046] 2) Lower the battery temperature to 5°C, and then charge it to 3.0V at 0.1C;

[0047] 3) Charge with a constant voltage of 3.0V until the charging current is less than 0.01C;

[0048] 4) Stand still for 1 hour, measure the open circuit voltage of the battery, if the open circuit voltage is lower than 3.0V, proceed to step 3, if not, proceed to step 5;

[0049] 5), adjust the battery voltage to 2.7V, and then inject the second electrolyte, wherein the content of vinylene carbonate VC is 4 (volume)%, then raise the temperature of the injected battery to 45°C, and let it stand for 1h;

[0050] 6) Lower the battery temperature to 5°C, and then charge it to 3.0V at 0.1C;

[0051] 7) Charge with a constant voltage of 3.0V until the charging current is les...

Embodiment 3

[0057] 1) Inject the assembled battery into the first electrolyte, in which the content of ethylene carbonate VEC is 2.5 (volume) %, then raise the temperature of the injected battery to 48°C, and let it stand for 1 hour;

[0058] 2) Lower the battery temperature to 8°C, and then charge it to 3.1V at 0.1C;

[0059]3) Charge with a constant voltage of 3.1V until the charging current is less than 0.01C;

[0060] 4) Stand still for 1 hour, measure the open circuit voltage of the battery, if the open circuit voltage is lower than 3.1V, proceed to step 3, if not, proceed to step 5;

[0061] 5), adjust the battery voltage to 2.7V, and then inject the second electrolyte, wherein the content of vinylene carbonate VC is 5 (volume)%, then raise the temperature of the battery after the liquid injection to 48°C, and let it stand for 1h;

[0062] 6) Lower the battery temperature to 8°C, then charge it to 3.1V at 0.1C;

[0063] 7) Charge with a constant voltage of 3.1V until the charging ...

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Abstract

The invention provides an opening formation method of a lithium-ion battery. The method of the invention keeps the liquid injection port of the battery open during the formation stage, and improves the stability of the SEI film of the battery by adjusting the formation pressure and controlling the composition change of the electrolyte. performance, thereby improving the cycle performance of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an opening formation method of lithium ion batteries. Background technique [0002] The formation process of lithium-ion batteries is a very important process in the production of lithium-ion batteries. During formation, the solvent and lithium salt in the electrolyte will form an SEI interface film on the surface of the electrode. This interface film can prevent the side reaction between the solvent and the active material and improve battery life. The formation quality of lithium-ion batteries directly affects the battery's capacity, internal resistance, and life span. In the existing technology, a film-forming agent is often used to promote the formation of SEI. Among them, VC is a negative electrode film-forming agent commonly used in this field, but because the unsaturated bond of VC is too active, it is easy to over-react during the film-forming process, resu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M2/36H01M10/0567H01M10/44H01M10/52
CPCH01M10/0567H01M10/058H01M10/446H01M10/52H01M50/60H01M50/668Y02E60/10Y02P70/50
Inventor 金哲宇徐建平巫云龙金妍
Owner 宇恒电池股份有限公司
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