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Method for reducing polarization of lithium battery

A lithium battery, reduction technology, applied in secondary batteries, electrochemical generators, secondary battery charging/discharging, etc., can solve problems affecting the performance of positive and negative electrodes of batteries

Inactive Publication Date: 2020-10-09
天科新能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing method of eliminating the polarization reaction is to add a depolarizer. For lithium-ion batteries, the addition of a depolarizer will affect the performance of the positive and negative electrodes of the battery.

Method used

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  • Method for reducing polarization of lithium battery
  • Method for reducing polarization of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for reducing polarization of lithium batteries:

[0020] S1. Discharge the lithium battery to a discharge cut-off voltage of 2.5V;

[0021] S2. In an environment with a temperature of 25 degrees Celsius, charge the lithium battery with positive and negative pulses to the charge cut-off voltage of 4.2V. In the positive and negative pulse charging mode, the positive pulse width is 9 seconds, the negative pulse width is 1 second, and the positive and negative pulses The pulse amplitude in the charging mode is equal to the charging magnification of the constant current charging mode, the period width of the positive and negative pulses is 1s, and the charging time is recorded;

[0022] S3. Place the charged lithium battery for 50 minutes so that the surface temperature of the lithium battery is the same as the ambient temperature;

[0023] S4. Perform constant current discharge on the lithium battery under the condition of an average charge rate of 03C, and record the amou...

Embodiment 2

[0025] A method for reducing polarization of lithium batteries:

[0026] S1. Discharge the lithium battery to a discharge cut-off voltage of 2.5V;

[0027] S2. In an environment with a temperature of 25 degrees Celsius, charge the lithium battery with positive and negative pulses to the charge cut-off voltage of 4.2V. In the positive and negative pulse charging mode, the positive pulse width is 9 seconds, the negative pulse width is 1 second, and the positive and negative pulses The pulse amplitude in the charging mode is equal to the charging rate of the constant current charging mode, the period width of the positive and negative pulses is 10s, and the charging time is recorded;

[0028] S3. Place the charged lithium battery for 55 minutes so that the surface temperature of the lithium battery is the same as the ambient temperature;

[0029] S4. Perform constant current discharge on the lithium battery under the condition of an average charge rate of 3C, and record the amount of ele...

Embodiment 3

[0031] A method for reducing polarization of lithium batteries:

[0032] S1. Discharge the lithium battery to a discharge cut-off voltage of 2.5V;

[0033] S2. In an environment with a temperature of 25 degrees Celsius, charge the lithium battery with positive and negative pulses to the charge cut-off voltage of 4.2V. In the positive and negative pulse charging mode, the positive pulse width is 9 seconds, the negative pulse width is 1 second, and the positive and negative pulses The pulse amplitude in the charging mode is equal to the charging magnification of the constant current charging mode, the cycle width of the positive and negative pulses is 50s, and the charging time is recorded;

[0034] S3. Place the charged lithium battery for 60 minutes so that the surface temperature of the lithium battery is the same as the ambient temperature;

[0035] S4. Perform constant current discharge on the lithium battery under the condition of an average charge rate of 3C, and record the amoun...

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Abstract

The invention discloses a method for reducing polarization of a lithium battery. The method comprises the steps of S1, discharging the lithium battery to a discharging cut-off voltage of 2.5V; S2, performing positive and negative pulse charging on the lithium battery until the charging cut-off voltage is 4.2V, and recording the charging time; S3, placing the charged lithium battery for 50 to 70 minutes; and S4, carrying out constant-current discharging on the lithium battery under the condition that the charging average multiplying power is 0.2-3C, and recording the electric quantity discharged when the lithium battery is discharged. The method has the advantages that new substances do not need to be involved, and the battery polarization reaction can be effectively reduced.

Description

Technical field [0001] The present invention relates to the technical field of lithium batteries, in particular to a method for depolarizing lithium batteries. Background technique [0002] With the development of science and technology, the application of batteries in mobile communications, electric vehicles, energy storage and other fields has become more and more extensive, including almost all areas of our production, life and scientific research. Especially in recent years, new energy vehicles at home and abroad have developed rapidly, the demand for batteries is increasing, and the performance requirements for batteries are also getting higher and higher. Emerging battery energy sources include lead-acid batteries, lithium batteries, and nickel-hydrogen batteries. These batteries are secondary batteries that can be continuously charged and discharged. According to electrochemical principles, the secondary batteries will exist in the form of primary batteries and electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/42H01M10/0525
CPCH01M10/446H01M10/448H01M10/42H01M10/0525Y02E60/10
Inventor 王英周伟李文康陈大圣宗哲
Owner 天科新能源有限责任公司
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