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Lithium battery diaphragm, preparation method thereof and lithium battery

A lithium battery diaphragm and inorganic particle technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of poor electrolyte wettability and poor liquid absorption capacity of the diaphragm

Inactive Publication Date: 2020-01-14
湖南艾威尔新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of composite membrane can improve the heat resistance of the separator, it also has some disadvantages, such as poor wettability between the ceramic coating and the lithium battery electrolyte, resulting in poor liquid absorption capacity of the separator.

Method used

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Effect test

preparation example Construction

[0022] The invention provides a preparation method of a lithium battery diaphragm, comprising the following steps:

[0023] Dispersing the modified inorganic particles into a solvent to obtain a dispersion slurry;

[0024] Coating the dispersion slurry onto the surface of the lithium battery separator substrate, and drying to obtain the lithium battery separator;

[0025] The modified inorganic particles are obtained by modifying inorganic particles with a silane coupling agent.

[0026] The invention disperses the modified inorganic particles into the solvent to obtain the dispersed slurry. In the present invention, the modified inorganic particles are obtained by modifying the inorganic particles with a silane coupling agent; the preparation of the modified inorganic particles preferably includes: mixing the silane coupling agent and ethanol, adding inorganic Particles, stirring, and solid-liquid separation to obtain modified inorganic particles. In the present invention,...

Embodiment 1

[0033] Mix 1.5g of silane coupling agent with 75mL of ethanol, add 30g of silicon dioxide (average particle size: 0.3μm) to the resulting mixture, stir at 400r / min for 1.5h, filter, dry and grind to obtain modified inorganic particles ;

[0034] Take 30g of modified inorganic particles and disperse them in 100mL of solvent (the volume ratio of ethanol and water in the solvent is 1:60) to obtain a dispersion slurry;

[0035] The dispersed slurry was brush-coated on the polypropylene separator, and dried at 40° C. to obtain a lithium battery separator (polypropylene layer 9 μm + modified inorganic particle layer 3 μm).

Embodiment 2

[0037] Mix 1.0g of silane coupling agent with 60mL of ethanol, add 30g of titanium dioxide (average particle size: 1.0μm) to the resulting mixture, stir at 600r / min for 1.0h, filter, dry, and grind to obtain modified inorganic particles;

[0038] Take 30g of modified inorganic particles and disperse them in 80mL of solvent (the volume ratio of ethanol and water in the solvent is 1:65) to obtain a dispersion slurry;

[0039] The dispersed slurry was brush-coated on the polypropylene separator, and dried at 60° C. to obtain a lithium battery separator (polypropylene layer 9 μm + modified inorganic particle layer 3 μm).

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Abstract

The invention relates to the technical field of battery diaphragms, in particular to a lithium battery diaphragm, a preparation method thereof and a lithium battery. The preparation method of the lithium battery diaphragm provided by the invention comprises the following steps: dispersing modified inorganic particles into a solvent to obtain dispersed slurry; coating a lithium battery diaphragm base material with the dispersed slurry, and performing drying to obtain a lithium battery diaphragm, wherein the modified inorganic particles are obtained by modifying inorganic particles with a silanecoupling agent. The inorganic particles have good hydrophilicity after being modified by the silane coupling agent, and can effectively enhance the liquid absorption capacity of the lithium battery diaphragm on the premise of keeping good heat resistance. Results of the embodiment show that the liquid absorption rate of the lithium battery diaphragm prepared by the method is up to 170-188%, and the hole closing temperature is 176-185 DEG C, which shows that the lithium battery diaphragm prepared by the method has good heat resistance and liquid absorption capacity.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a lithium battery separator, a preparation method thereof, and a lithium battery. Background technique [0002] A lithium battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. As one of the important components of the lithium battery, the separator has the function of separating the positive and negative electrodes of the lithium battery and at the same time allowing the electrolyte ions to migrate freely. The performance of the separator has an important impact on the safety performance and electrical performance of lithium batteries. [0003] At present, the commonly used separators for lithium batteries are mainly polyethylene (PE) separators and polypropylene (PP) separators. The melting point of the PE separator is about 130°C, and the melting point of the PP separator is about 160°C. When the current is too large, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/431H01M50/403Y02E60/10
Inventor 冯相士
Owner 湖南艾威尔新能源科技有限公司
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