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Liquid injection formation method of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, electrochemical generators, battery components, etc., can solve the problems of battery gas production and internal resistance increase, affecting the formation effect, etc., to achieve a balanced gas production speed , to avoid the effect of polluting the environment and

Inactive Publication Date: 2021-09-03
苏州斯派锐智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The liquid injection method of lithium ion battery has a great influence on the performance of the battery. When the positive electrode active material of lithium ion battery is LiNi 0.35 mn 0.62 Nb 0.01 Cr 0.02 o 2 It has a high working voltage and charge cut-off voltage, but under high pressure, the electrolyte is prone to decomposition, so it is necessary to inject overcharge additives such as biphenyl and cyclohexylbenzene, but after the additive is injected, the battery will produce gas during the formation process. and internal resistance increases, which affect the formation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Inject the mixed solution of electrolyte a and electrolyte b into the lithium ion battery to be injected, and the mixed solution accounts for 70% of the total electrolyte volume; in the mixed solution, the amount of electrolyte a and electrolyte b The volume ratio is 85:15; the additive in the electrolyte a is vinylene carbonate, and its concentration in the electrolyte a is 2.5% by volume; the additive in the electrolyte b is vinyl sulfite, which is in The concentration in the electrolyte b is 1.5% by volume;

[0029] 2) At a temperature of 45 degrees Celsius, charge the battery with a constant current of 0.05C to the first predetermined voltage, and then perform a constant current charge and discharge cycle of 0.01C between the first predetermined voltage and the second predetermined voltage; The first predetermined voltage is 3.62V; the second predetermined voltage is 3.75V;

[0030] 3) Stand at room temperature for more than 20 minutes until the battery temperat...

Embodiment 2

[0035] 1) Inject the mixed solution of electrolyte a and electrolyte b into the lithium ion battery to be injected, and the mixed solution accounts for 80% of the total electrolyte volume; in the mixed solution, the amount of electrolyte a and electrolyte b The volume ratio is 88:12; the additive in the electrolyte a is vinylene carbonate, and its concentration in the electrolyte a is 3% by volume; the additive in the electrolyte b is vinyl sulfite, which is in The concentration in the electrolyte b is 2% by volume;

[0036] 2) At a temperature of 50 degrees Celsius, charge the battery with a constant current of 0.2C to the first predetermined voltage, and then perform a constant current charge and discharge cycle of 0.03C between the first predetermined voltage and the second predetermined voltage; The first predetermined voltage is 3.68V; the second predetermined voltage is 3.82V;

[0037] 3) Stand at room temperature for more than 20 minutes until the battery temperature d...

Embodiment 3

[0042]1) Inject the mixed solution of electrolyte a and electrolyte b into the lithium ion battery to be injected, and the mixed solution accounts for 75% of the total electrolyte volume; in the mixed solution, the amount of electrolyte a and electrolyte b The volume ratio is 86:14; the additive in the electrolyte a is vinylene carbonate, and its concentration in the electrolyte a is 2.8% by volume; the additive in the electrolyte b is vinyl sulfite, which is in The concentration in the electrolyte b is 1.8% by volume;

[0043] 2) At a temperature of 45 degrees Celsius, charge the battery with a constant current of 0.1C to the first predetermined voltage, and then perform a constant current charge and discharge cycle of 0.02C between the first predetermined voltage and the second predetermined voltage; The first predetermined voltage is 3.65V; the second predetermined voltage is 3.78V;

[0044] 3) Stand at room temperature for more than 20 minutes until the battery temperatur...

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PUM

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Abstract

The invention provides a liquid injection formation method of a lithium ion battery. The method comprises the following steps: injecting a mixed solution of an electrolyte a and an electrolyte b into the battery, wherein the mixed solution accounts for 70-80% of the total volume of the electrolyte, in the mixed solution, the volume ratio of the electrolyte a to the electrolyte b is 85:15 to 88:12, an additive in the electrolyte a is vinylene carbonate, and an additive in the electrolyte b is ethylene sulfite; carrying out first formation at high temperature, after formation is finished, standing at normal temperature for a preset time, injecting the electrolyte b accounting for 10-15% of the total electrolyte volume again, and then carrying out second formation at low temperature; after vacuumizing and exhausting, injecting an electrolyte c accounting for 10-15% of the total electrolyte volume, wherein an additive in the electrolyte c is selected from at least one of biphenyl and cyclohexylbenzene; and performing sealing to obtain the lithium ion battery. According to the liquid injection formation method disclosed by the invention, the gas production rate is relatively low during formation, the internal resistance of the battery is relatively low, and the rate capability and the cycle performance are very excellent.

Description

technical field [0001] The invention relates to a liquid injection and formation method of a lithium ion battery. Background technique [0002] The liquid injection method of lithium ion battery has a great influence on the performance of the battery. When the positive electrode active material of lithium ion battery is LiNi 0.35 mn 0.62 Nb 0.01 Cr 0.02 o 2 It has a high working voltage and charge cut-off voltage, but under high pressure, the electrolyte is prone to decomposition, so it is necessary to inject overcharge additives such as biphenyl and cyclohexylbenzene, but after the additive is injected, the battery will produce gas during the formation process. The increase of internal resistance and internal resistance are large, which affects the formation effect. Contents of the invention [0003] The invention provides a liquid injection and formation method of a lithium-ion battery. The liquid injection formation method includes: injecting a mixed solution of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M50/609H01M10/0567H01M10/058H01M10/0525
CPCH01M10/446H01M50/609H01M10/0567H01M10/058H01M10/0525Y02P70/50Y02E60/10
Inventor 石磊
Owner 苏州斯派锐智能科技有限公司