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A method and device for improving the cycle stability of lithium-ion batteries

A lithium-ion battery, cycle stability technology, applied in the field of electrochemistry, can solve problems such as poor cycle effect stability, achieve the effect of improving cycle stability, improving cycle stability, and improving stability

Active Publication Date: 2022-03-04
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention proposes a method and device for improving the cycle stability of lithium-ion batteries, aiming to solve the problem of poor cycle stability of current lithium-ion batteries in extreme environments of high temperature and high current

Method used

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  • A method and device for improving the cycle stability of lithium-ion batteries
  • A method and device for improving the cycle stability of lithium-ion batteries
  • A method and device for improving the cycle stability of lithium-ion batteries

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Experimental program
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Effect test

Embodiment 1

[0060] Lithium-ion battery forming method comprises the following steps:

[0061] Step S110: Assemble a lithium-ion (LiFePO4 / Li) battery in the glove box. After the packaging is completed, let it stand at room temperature for a second preset time. The second preset time can be 8 hours;

[0062] Step S120: Put the lithium-ion battery to be formed into a constant temperature incubator, connect it to the formation circuit, set the temperature of the constant temperature incubator at 23°C, keep the battery in a constant temperature condition, and charge the lithium-ion battery with a constant current for 10 minute;

[0063] Step S130: Set the current cycle mode for charging the lithium-ion battery to positive-reverse differential pulse current, and charge it to 4.2V, use the positive-contrast pulse current to form the lithium-ion battery, and use the forward differential pulse current The current intensity is 0.2C, the reverse differential pulse current intensity is 0.03C, and th...

Embodiment 2

[0068] Lithium-ion battery forming method comprises the following steps:

[0069] Step S110: Assemble a lithium-ion (LiFePO4 / Li) battery in a glove box. After the packaging is completed, let it stand at room temperature for a second preset time. The second preset time can be 8 hours, and the size of the lithium iron phosphate nanoparticles used is 1μm;

[0070] Step S120: Put the lithium-ion battery to be formed into a constant temperature incubator, connect it to the formation circuit, set the temperature of the constant temperature incubator at 23°C, keep the battery in a constant temperature condition, and charge the lithium-ion battery with a constant current for 10 minute;

[0071] Step S130: Set the current cycle mode for charging the lithium-ion battery to positive-reverse differential pulse current, and charge it to 4.2V, use the positive-contrast pulse current to form the lithium-ion battery, and use the forward differential pulse current The current intensity is 0....

Embodiment 3

[0076] Lithium-ion battery forming method comprises the following steps:

[0077] Step S110: Assemble a lithium-ion (LiFePO4 / Li) battery in the glove box. After the packaging is completed, let it stand at room temperature for a second preset time. The second preset time can be 8 hours;

[0078] Step S120: Put the lithium-ion battery to be formed into a constant temperature incubator, connect it to the formation circuit, set the temperature of the constant temperature incubator at 23°C, keep the battery in a constant temperature condition, and charge the lithium-ion battery with a constant current for 10 minute;

[0079] Step S130: Set the current cycle mode for charging the lithium-ion battery to positive-reverse differential pulse current, and charge it to 4.2V, use the positive-contrast pulse current to form the lithium-ion battery, and use the forward differential pulse current The current intensity is 0.2C, the reverse differential pulse current intensity is 0.04C, and th...

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Abstract

The present invention provides a method and device for improving the cycle stability of a lithium-ion battery, wherein the method comprises the following steps: charging the lithium-ion battery with a constant current for a first preset time; performing forward-reverse charging on the lithium-ion battery Differential pulse current alternating constant current charging, and charging to the first preset voltage; constant voltage charging of the lithium-ion battery; constant current discharge of the lithium-ion battery after charging. In the present invention, the lithium-ion battery formation method can improve the cycle stability of the lithium-ion battery under extreme conditions. Compared with the traditional constant current formation of lithium-ion batteries, this method can significantly improve the cycle stability of lithium batteries under extreme conditions. At the same time, the process has the advantages of being simple and easy to operate, and does not require external additives. At the same time, the improvement effect of the lithium-ion battery formation method on the cycle performance of the lithium-ion battery is not affected by the size of the film-forming additives and active material nanoparticles.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a chemical formation method and a device for improving the cycle stability of a lithium-ion battery. Background technique [0002] Due to the increasing awareness of environmental protection and the increasing demand for large-capacity energy storage devices, the problem of poor cycle stability of lithium-ion batteries under extreme conditions of high temperature and high current needs to be solved urgently. Formation is an important process to improve the application performance of lithium-ion batteries. The main purpose of this process is to form a passivation film on the surface of the electrode material, which is called a solid electrolyte film. important meaning. [0003] At present, the formation method of lithium-ion batteries is mainly to place the packaged lithium-ion batteries for a period of time, and then adopt a low-current charge-discharge cycle method, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/446H01M10/0525Y02E60/10
Inventor 胡晨水江澜朱少青金翼孙召琴王绥军穆居易黎可于冉刘超群刘家亮
Owner CHINA ELECTRIC POWER RES INST