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Formation method of low-self-discharge lithium ion battery

A technology of lithium-ion battery and formation method, which is applied in the field of formation of low self-discharge lithium-ion battery, can solve the problems of not being able to meet the actual production requirements, battery internal resistance storage capacity and low cycle capacity, etc., so as to reduce self-discharge phenomenon, Effect of improving cycle performance

Active Publication Date: 2021-07-13
江门市力源电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal resistance, storage capacity and cycle capacity of the battery in this patent document are still low, which still cannot meet the needs of actual production.

Method used

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  • Formation method of low-self-discharge lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1), inject electrolyte solution for the first time, the injected electrolyte solution accounts for 70% of the total electrolyte solution volume, and add 0.05mol / L dimethyl sulfone in the described electrolyte solution;

[0030] 2) Move the liquid-injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen, adjust the temperature in the sealing device to 5°C, charge with a constant current of 0.001C for 10h; then charge with a current of 0.01C 10h;

[0031] 3), the battery in step 2) is taken out from the sealing device, and the electrolyte solution is injected for the second time, and 0.01mol / L sodium hexafluorophosphate is added to the electrolyte solution in the electrolyte solution;

[0032] 4) Move the liquid-injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen gas, adjust the temperature in the sealing device to 25°C, charge at a constant current of 0.01C for 10h, and then charge at a current of...

Embodiment 2

[0038] 1), inject electrolyte for the first time, the injected electrolyte accounts for 80% of the total electrolyte volume, and add 0.1mol / L dimethyl sulfone in the electrolyte;

[0039] 2) Move the liquid-injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen, adjust the temperature in the sealing device to 5°C, and charge at a constant current of 0.005C for 5 hours; then charge at a current of 0.03C 5h;

[0040] 3), the battery in step 2) is taken out from the sealing device, and the electrolyte is injected twice, and 0.005mol / L sodium hexafluorophosphate is added to the electrolyte;

[0041] 4) Move the injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen gas, adjust the temperature in the sealing device to 25°C, charge at a constant current of 0.05C for 5 hours; charge at a current of 0.1C 5h;

[0042] 5) Adjust the temperature in the sealing device to 45°C, and charge to 4.2V with a constant cu...

Embodiment 3

[0047] 1), inject electrolyte for the first time, the injected electrolyte accounts for 75% of the total electrolyte volume, and add 0.08mol / L dimethyl sulfone in the electrolyte;

[0048] 2) Move the liquid-injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen, adjust the temperature in the sealing device to 5°C, charge with a constant current of 0.003C for 5 hours; charge with a current of 0.02C 5h;

[0049] 3), the battery in step 2) is taken out from the sealing device, and the electrolyte is injected twice, and 0.008mol / L sodium hexafluorophosphate is added to the electrolyte;

[0050] 4) Move the injected lithium-ion battery into the sealing device, fill the sealing device with nitrogen gas, adjust the temperature in the sealing device to 25°C, charge with a constant current of 0.03C for 5h; charge with a current of 0.09C 5h;

[0051] 5) Adjust the temperature in the sealing device to 35°C, and charge to 4.2V with a constant curren...

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Abstract

The invention provides a formation method of a low-self-discharge lithium ion battery. The formation method comprises: injecting liquid for the first time, performing first formation by controlling charging current in a low-temperature environment, injecting liquid for the second time, performing second formation by controlling current in a normal-temperature environment, and performing third formation in a high-temperature environment, wherein electrolyte components for the first liquid injection and the second liquid injection are different. Through the formation method provided by the invention, a more compact SEI film is formed, the self-discharge is lower after long-term storage, and the longer cycle life is still kept after storage.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a formation method of a low self-discharge lithium ion battery. Background technique [0002] With the popularization of new energy vehicles, the demand for power batteries is gradually increasing. Power batteries have the advantages of high energy density, fast charging, and environmental protection, and are widely used in new energy vehicles. Although power batteries have good rate performance and fast charging and discharging, but Compared with traditional lithium-ion batteries, the self-discharge phenomenon of power batteries is more serious, resulting in a waste of energy. At the same time, long-term self-discharge will also cause the active materials of the battery to fall off, resulting in serious life attenuation. [0003] CN109888421 A The invention provides a method for forming a low self-discharge lithium-ion battery, wherein the method for forming compri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/446H01M10/0525Y02E60/10
Inventor 傅舒顺何青尹荔松
Owner 江门市力源电子有限公司
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