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Method for detecting thermal stability of of electrode material of lithium ion battery

A technology for lithium ion batteries and electrode materials, which is applied in the field of detection of thermal stability of electrode materials for lithium ion batteries, can solve the problems of thermal stability, poor safety, affecting battery safety performance, and difficulty in accurately measuring the thermal stability of positive electrode materials. , to achieve the effect of reducing polarization resistance and improving accuracy

Pending Publication Date: 2021-11-02
南方电网电动汽车服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with lithium iron phosphate materials, ternary high-nickel materials have higher capacity, and have the advantages of high electrical conductivity and good rate performance, but ternary high-nickel materials have poor thermal stability and safety, and will be damaged at high temperatures Release extremely active singlet oxygen molecules and react violently with the electrolyte, generating a large amount of heat while generating oxygen molecules as a combustion aid, which seriously affects the safety performance of the battery
However, it is usually difficult to accurately measure the thermal stability of cathode materials due to the existence of the internal resistance of the battery polarization and the interference of electrolytes and other substances.
At the same time, due to the easy introduction of impurities in the test operation, the reproducibility of the test results is poor

Method used

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  • Method for detecting thermal stability of of electrode material of lithium ion battery
  • Method for detecting thermal stability of of electrode material of lithium ion battery
  • Method for detecting thermal stability of of electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) The positive electrode material is a ternary high-nickel material LiNi 0.8 co 0.1 mn 0.1 o 2 The pouch battery was charged to 4.25V by galvanostatic intermittent titration (GITT). The GITT pulse current was 0.05C, the constant current time was 18min, and the relaxation time was 30min.

[0058] (2) Then, in the glove box, the pouch battery was disassembled, the positive electrode piece was taken out, washed three times in dichloromethane solvent, and dried.

[0059] (3) First weigh the weight of the high-pressure crucible, then in the glove box, scrape a certain amount of positive electrode material powder on the surface of the positive electrode sheet, put it into the high-pressure crucible and seal it, weigh the high-pressure crucible again, and the weight difference between the front and back of the high-pressure crucible is The weight of the scraped cathode material powder.

[0060] (4) Transfer the sealed high-pressure crucible to a differential scanning ca...

Embodiment 2

[0062] (1) The positive electrode material is a ternary high-nickel material LiNi 0.8 co 0.1 mn 0.1 o 2 The pouch battery was charged to 4.1V by galvanostatic intermittent titration (GITT). The GITT pulse current was 0.05C, the constant current time was 18min, and the relaxation time was 30min.

[0063] (2) Then, in the glove box, the pouch battery was disassembled, the positive electrode piece was taken out, washed three times in dichloromethane solvent, and dried.

[0064] (3) First weigh the weight of the high-pressure crucible, then in the glove box, scrape a certain amount of positive electrode material powder on the surface of the positive electrode sheet, put it into the high-pressure crucible and seal it, weigh the high-pressure crucible again, and the weight difference between the front and back of the high-pressure crucible is The weight of the scraped cathode material powder.

[0065] (4) Transfer the sealed high-pressure crucible to a differential scanning cal...

Embodiment 3

[0067] (1) The positive electrode material is a ternary high-nickel material LiNi 0.8 co 0.1 mn 0.1 o 2 The pouch battery was charged to 4.0V by galvanostatic intermittent titration (GITT). The GITT pulse current was 0.05C, the constant current time was 18min, and the relaxation time was 30min.

[0068] (2) Then, in the glove box, the pouch battery was disassembled, the positive electrode piece was taken out, washed three times in dichloromethane solvent, and dried.

[0069] (3) First weigh the weight of the high-pressure crucible, then in the glove box, scrape a certain amount of positive electrode material powder on the surface of the positive electrode sheet, put it into the high-pressure crucible and seal it, weigh the high-pressure crucible again, and the weight difference between the front and back of the high-pressure crucible is The weight of the scraped cathode material powder.

[0070] (4) Transfer the sealed high-pressure crucible to a differential scanning cal...

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Abstract

The invention relates to a method for detecting the thermal stability of an electrode material of a lithium ion battery. The method comprises the following steps: charging the lithium ion battery to a target potential by a quasi-steady-state charging method; under the protection of protective gas, disassembling the lithium ion battery to obtain a pole piece; under the protection of protective gas, cleaning the pole piece, drying, and scraping electrode material powder on the surface of the pole piece; and carrying out thermal analysis test on the electrode material powder under the protection of protective gas. The quasi-steady-state charging mode is adopted to charge the lithium ion battery, so that the polarization resistance in the charging process can be effectively reduced, and the potential of the lithium ion battery can be accurately controlled; by cleaning the pole piece, impurities on the surface of the electrode material can be removed, and the measurement accuracy is further improved. The detection method can be used for detecting the thermal stability of the positive electrode material and the negative electrode material of the lithium ion battery, and is especially suitable for detecting the thermal stability of the positive electrode material of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a detection method for thermal stability of electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries are a type of batteries that use lithium-containing materials as electrodes and rely on the movement of lithium ions between the positive and negative electrodes to work. Due to the advantages of high energy density, high power density, and long cycle life, lithium-ion batteries have received great attention in the fields of portable electronic devices, power batteries, and energy storage batteries, and have gradually been widely used in automotive power sources. . In order to meet the battery life demands of electric vehicles, the research of lithium-ion batteries is developing towards higher energy density. However, the safety issue of lithium-ion batteries is still an obstacle limiting its development and application. ...

Claims

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Application Information

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IPC IPC(8): G01N25/20H01M4/1391H01M10/0525
CPCG01N25/20H01M4/1391H01M10/0525Y02E60/10
Inventor 李蓝特李勋黄鹏邹大中陈浩舟
Owner 南方电网电动汽车服务有限公司
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