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Chemical forming process of a lithium ion battery

A lithium-ion battery and process technology, which is applied in the field of lithium-ion battery formation process, can solve problems such as electrolyte gushing out and difficult control of gas production speed, and achieve the effects of eliminating polarization, excellent performance, and avoiding waste

Active Publication Date: 2019-01-22
星恒电源(滁州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries are injected after drying, and go through the formation process. In order to discharge the gas generated during the formation, the open formation is generally used. In the open formation, because the gas production rate is difficult to control, the electrolyte will be lost during the formation process. As gas gushes out of the injection hole

Method used

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  • Chemical forming process of a lithium ion battery
  • Chemical forming process of a lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] 1), inject the first electrolytic solution accounting for 50% of the total volume of the electrolytic solution to the lithium-ion battery to be injected, the first electrolytic solution includes an electrolyte salt, a non-aqueous solvent and an additive of 3% volume, and the electrolytic salt is A mixed electrolyte salt of 1.5mol / L lithium hexafluorophosphate and 0.01mol / L sodium bisoxalate borate, the non-aqueous solvent is ethylene carbonate, the additive is vinylene carbonate, and the battery after liquid injection is placed on the chemical conversion device, so Said chemical conversion device is located in the glove box;

[0036] 2), repeat the process of vacuuming-introducing nitrogen 4 times, adjust the air pressure in the glove box to 0.01MPa, and let it stand for 0.1h; the nitrogen contains 500ppm nitric oxide;

[0037] 3), feed the nitrogen gas, adjust the pressure in the sealing device to 0.3MPa, charge with a constant current of 0.02C, and charge to the first...

Embodiment 2

[0048] 1), inject the first electrolytic solution accounting for 70% of the total volume of the electrolytic solution to the lithium-ion battery to be injected, the first electrolytic solution includes an electrolyte salt, a non-aqueous solvent and an additive of 5% volume, and the electrolytic salt is A mixed electrolyte salt of 1.8mol / L lithium hexafluorophosphate and 0.02mol / L sodium bisoxalate borate, the non-aqueous solvent is ethylene carbonate, the additive is ethylene sulfite, the battery after the liquid injection is placed on the chemical conversion device, the Said chemical conversion device is located in the glove box;

[0049] 2), repeat the process of vacuuming-introducing nitrogen 4 times, adjust the air pressure in the glove box to 0.01MPa, and let it stand for 1h; the nitrogen contains 2000ppm nitric oxide;

[0050] 3), feed the nitrogen gas, adjust the pressure in the sealing device to 0.5MPa, charge with a constant current of 0.05C, and charge to the first s...

Embodiment 3

[0061] 1), inject the first electrolytic solution accounting for 60% of the total volume of the electrolytic solution to the lithium-ion battery to be injected, the first electrolytic solution includes electrolyte salt, non-aqueous solvent and 4% volume additive, and the electrolytic salt is A mixed electrolyte salt of 1.6mol / L lithium hexafluorophosphate and 0.01mol / L sodium bisoxalate borate, the non-aqueous solvent is ethylene carbonate, the additive is vinylene carbonate, and the battery after the liquid injection is placed on the chemical conversion device. Said chemical conversion device is located in the glove box;

[0062] 2), repeat the process of vacuuming-introducing nitrogen 4 times, adjust the air pressure in the glove box to 0.01MPa, and let it stand for 1h; the nitrogen contains 1000ppm nitric oxide;

[0063] 3), feed the nitrogen gas, adjust the pressure in the sealing device to 0.4MPa, charge with a constant current of 0.04C, and charge to the first set voltag...

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Abstract

The invention provides a chemical forming process of a lithium ion battery, which comprises controlling the injection liquid, atmosphere, pressure, temperature and the forming current and voltage during the chemical forming process, thereby promoting the formation of a dense SEI film on the electrode surface of the lithium ion battery, and improving the cycle life and capacity retention of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a formation process of lithium ion batteries. Background technique [0002] Lithium-ion batteries are injected after drying and go through the formation process. In order to discharge the gas generated during the formation, the open formation is generally used. In the open formation, because the gas production rate is difficult to control, the electrolyte will be lost during the formation process. As the gas gushes out from the injection hole. At the same time, the formation process is the process of forming the SEI film in the battery. The formation process directly affects the structure of the SEI, and the SEI film has a significant impact on the cycle performance of the battery. Contents of the invention [0003] The invention provides a lithium ion battery formation process, which includes the control of liquid injection, atmosphere, pressure, temperature and...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 盛蕾
Owner 星恒电源(滁州)有限公司
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