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Preparation method of ceramic modified polyolefin porous membrane for power lithium battery

A lithium battery and polyolefin technology, applied in the direction of secondary batteries, battery pack parts, secondary battery repair/maintenance, etc., can solve the problems of raising the cost of power lithium batteries and high raw material prices, and achieve high electrolyte retention rate, The effect of high porosity and high electrical conductivity

Inactive Publication Date: 2018-11-13
杨凯
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The existing ceramic diaphragms mostly use high-purity nano-Al2O3, SiO2, etc., and the price of raw materials is high.
Raised the cost of power lithium battery

Method used

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Embodiment Construction

[0011] A preparation method of a ceramic modified polyolefin porous membrane for a power lithium battery, comprising the following steps: 1, barium sulfate powder and (C2H2F2)n are respectively added in C5H9NO, and the concentration of forming barium sulfate is 5.6-6.3%, ( The concentration of C2H2F2)n is a mixed solution of 2.4-2.7%. Add a dispersant to the mixed solution, and use a magnetic stirrer to stir the mixed solution; 2. After 2 hours of magnetic stirring, a primary slurry is formed, and the primary slurry is ball milled for 2 hours. Obtain the coating slurry; 3. Soak the polypropylene substrate in ethanol and perform ultrasonic treatment and drying; 4. Apply the coating slurry evenly on both sides of the polypropylene substrate by dip coating method; 5. At room temperature Air-dried, and finally vacuum-dried at 60° C. for 24 hours to obtain a ceramic-modified polyolefin porous membrane. The weight of the dispersant is 2% of the barium sulfate powder weight. The thi...

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PUM

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Abstract

The invention discloses a preparation method of a ceramic modified polyolefin porous membrane for a power lithium battery. The preparation method comprises the following steps: 1, respectively addingBsSO4 powder and (C2H2F2)n in C5H9NO, thus forming a mixed solution in which the concentration of BaSO4 is 5.6 to 6.3 percent and the concentration of the (C2H2F2)n is 2.4 to 2.7 percent; adding a dispersion agent in the mixed solution, and stirring the mixed solution by using a magnetic stirrer; 2, forming primary slurry after magnetically stirring for 2 hours, and carrying out ball milling on the primary slurry for 2 hours, thus obtaining coating slurry; 3, immersing a polypropylene matrix in ethanol, carrying out ultrasonic treatment, and drying; 4, uniformly coating two surfaces of the polypropylene matrix with the coating slurry by adopting an immersing and coating method; 5, airing at room temperature, and finally carrying out vacuum drying for 24 hours under the condition that the temperature is 60 DEG C, thus obtaining the ceramic modified polyolefin porous membrane. The ceramic modified polyolefin porous membrane prepared by adopting the preparation method disclosed by the invention has the advantages of high electrolyte retention rate, good thermal dimension stability, high porosity and high conductivity; the battery performance and the safety performance of the power aluminum battery can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of power lithium batteries, in particular to a method for preparing a ceramic-modified polyolefin porous membrane for a power lithium battery. Background technique [0002] With the rapid development of new energy vehicles, lithium-ion batteries are widely used in the automotive industry, and the accompanying safety problems are not uncommon. The root cause of power lithium-ion battery safety accidents is thermal runaway of the battery, which refers to catastrophic accidents such as spontaneous combustion and explosion of the battery caused by thermal reactions between battery materials. The diaphragm is a component closely related to the safety performance of the power lithium battery, and is directly related to the safety performance of the power lithium-ion battery. [0003] At present, the ceramic composite diaphragm prepared with polyolefin as the matrix is ​​the most widely used diaphragm material in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 杨凯
Owner 杨凯
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