Paint for inhibiting thermal runaway of lithium ion battery, coating, positive plate, negative plate, diaphragm and lithium ion battery

A lithium-ion battery, thermal runaway technology, applied to battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve problems such as inability to effectively control thermal runaway, slow release of flame retardants, blocking flame retardants, etc., to achieve inhibition Thermal failure of batteries and the effect of suppressing thermal runaway of batteries

Inactive Publication Date: 2020-12-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the capsule shell material melts first, and the capsule shell material will block the release of the flame retardant and the full contact with the chemical reactants; on the other hand, the release rate of the flame retardant is too slow, far slower than the reaction rate of thermal runaway , thus leading to ineffective control of thermal runaway

Method used

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  • Paint for inhibiting thermal runaway of lithium ion battery, coating, positive plate, negative plate, diaphragm and lithium ion battery
  • Paint for inhibiting thermal runaway of lithium ion battery, coating, positive plate, negative plate, diaphragm and lithium ion battery
  • Paint for inhibiting thermal runaway of lithium ion battery, coating, positive plate, negative plate, diaphragm and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 13

[0080] Mix the inhibitor particles prepared in the above-mentioned Examples 1 to 12, the binder carboxymethyl cellulose and the solvent N,N-dimethylformamide (DMF), and then coat them on 5Ah soft-packed lithium The positive pole piece of the ion battery is used as the test battery, and the 5Ah soft-pack lithium-ion battery is used as the reference battery to carry out the thermal runaway test. The test battery coated with the inhibitor particles prepared in Examples 1 to 12 is compared with the thermal runaway of the reference battery. The maximum temperature was significantly reduced, indicating that the coating of inhibitor particles into the positive electrode sheet of the battery can effectively inhibit the thermal runaway of the battery. Wherein the most obvious reduction effect is the test cell coated with the inhibitor prepared in Example 1, such as image 3 As shown, the maximum thermal runaway temperature of the test battery was reduced to 622.7°C, which was 132.8°C l...

Embodiment 14

[0082] Mix the inhibitor particles prepared in the above-mentioned Examples 1 to 12, the binder carboxymethyl cellulose and the solvent N,N-dimethylformamide (DMF), and then coat them on 5Ah soft-packed lithium The ion battery negative pole piece is used as the test battery, and the 5Ah soft-pack lithium ion battery is used as the reference battery for thermal runaway testing. The maximum temperature was significantly reduced, indicating that the coating of inhibitor particles into the negative electrode sheet of the battery can effectively inhibit the thermal runaway of the battery. The damage caused by thermal runaway is mainly caused by its maximum temperature. The higher the maximum temperature, the greater the damage. Therefore, the maximum temperature is reduced, and the risk of thermal runaway of the battery is significantly reduced (the lithium-ion batteries prepared in Examples 1 to 12 have no smoke, fire, or explosion).

Embodiment 15

[0084] Mix the inhibitor particles prepared in the above-mentioned Examples 1 to 12, the binder carboxymethyl cellulose and the solvent N,N-dimethylformamide (DMF), and then coat them on 5Ah soft-packed lithium The ion battery diaphragm is used as a test battery, and the 5Ah soft-pack lithium-ion battery is used as a reference battery for thermal runaway testing. The test battery coated with the inhibitor particles prepared in Examples 1 to 12 has the highest thermal runaway rate compared with the reference battery. The temperature decreased significantly, indicating that the coating of inhibitor particles into the battery separator can also effectively inhibit the thermal runaway of the battery. The damage caused by thermal runaway is mainly caused by its maximum temperature. The higher the maximum temperature, the greater the damage. Therefore, the maximum temperature is reduced, and the risk of thermal runaway of the battery is significantly reduced (the lithium-ion batteri...

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Abstract

The invention relates to a paint for inhibiting thermal runaway of a lithium ion battery. The paint comprises inhibitor particles, a binder and a solvent, the inhibitor particle is a microsphere witha shell-core structure and comprises a shell, a poisoning agent and a dispersing agent, wherein the poisoning agent and the dispersing agent are wrapped in an inner core; wherein the shell is formed by an organic polymer with the breaking tensile strength of 25MPa to 85MPa; the poisoning agent is reacted with a battery electrolyte or chemical substances in positive and negative electrodes to inhibit thermal runaway of the battery; wherein the dispersing agent has the functions of rapidly gasifying and expanding and enabling the shell to be burst into pieces to release and disperse the poisoning agent when the external temperature reaches a set temperature, and the set temperature is lower than the triggering temperature of thermal runaway of the lithium ion battery. The invention also relates to a coating formed by the paint. The invention further relates to a positive plate, a negative plate, a diaphragm and a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a coating, a coating, a positive electrode sheet, a negative electrode sheet, a diaphragm and a lithium-ion battery for suppressing thermal runaway of the lithium-ion battery. Background technique [0002] The application of lithium-ion batteries in the field of new energy vehicles is becoming more and more widespread, but the safety of lithium-ion batteries is also very prominent, which has become an important factor restricting its development. Thermal runaway is a key issue in lithium battery safety research, and thermal runaway of batteries can cause fire or even explosion. Conventional thermal runaway prevention methods can be divided into three categories: first, to prevent abuse. For example, the installation of circuit fuses, mechanical coatings to improve mechanical extrusion impact performance, anti-overcharge design, and current collector design with fra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D101/28C09D127/12C09D177/00C09D123/12C09D123/06C09D7/65H01M2/16H01M4/13H01M4/62H01M10/0525H01M10/42
CPCC08L2203/20C08L2205/18C08L2207/53C09D101/284C09D7/65C09D7/70H01M4/13H01M4/628H01M10/0525H01M10/4235H01M2200/10C08L27/12C08L77/00C08L23/12C08L23/06Y02E60/10
Inventor 冯旭宁王莉何向明欧阳明高任东生
Owner TSINGHUA UNIV
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