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Preparation method of special composite coating diaphragm for lithium battery

A technology of composite coating and manufacturing method, which is applied in the direction of battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problem of lack of comprehensive performance and the inability to meet the high safety and high energy density lithium batteries. Cycle life and other performance requirements and other issues, to achieve the effect of good flatness, small deformation, high voltage

Active Publication Date: 2018-05-04
桑顿新能源科技(长沙)有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The single-material and simple-structure ceramic coating film based on polypropylene or polyethylene separator will not be able to meet the performance requirements of high-energy-density lithium batteries for high voltage, high safety and high cycle life due to their lack of comprehensive performance.

Method used

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  • Preparation method of special composite coating diaphragm for lithium battery

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Embodiment 1

[0039]S1: Surface modification of boehmite alumina: Put the boehmite alumina in a drying oven and dry it completely for later use, then weigh the silane coupling agent, and control the molar ratio of boehmite alumina and silane coupling agent to 1:1, then mix the boehmite alumina and silane coupling agent, and disperse in the ultrasonic disperser for 30 minutes; then pour the mixed liquid into the three-necked flask, control the temperature in the three-necked flask to 150°C, and then mechanically Reflux for 2 hours under stirring, the obtained product was washed with deionized water, then centrifuged until the pH value of the supernatant was 7, then the obtained product was placed in a fume hood to dry naturally, and the air-drying time was controlled at 2 days, then place the product in a vacuum drying oven, control the temperature in the vacuum drying oven to 60°C, and control the drying time at 12 hours, and obtain surface-modified boehmite alumina powder after drying;

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Abstract

The invention discloses a special composite coating diaphragm for a lithium battery. The special composite coating diaphragm comprises a microporous membrane, resin layers, ceramic layers and acrylicadhesive layers; the special composite coating diaphragm is characterized in that the resin layers coat the upper surface and the lower surface of the microporous membrane; one ceramic layer coats theouter side of each resin layer; one acrylic adhesive layer coats the outside of each ceramic layer; first micropores are formed in the microporous membrane; second micropores are formed in each resinlayer; third micropores are formed in each ceramic layer; and fourth micropores are formed in each acrylic adhesive layer. A preparation method of the special composite coating diaphragm for the lithium battery comprises the following steps of surface modification of boehmite alumina, preparation of the microporous membrane, preparation of a polymer composite membrane, preparation of modified boehmite alumina slurry, coating of the modified boehmite alumina slurry and bonding forming of an acrylic adhesive, thereby obtaining the special composite coating diaphragm for the lithium battery. According to the composite coating diaphragm, the security problem of a high-energy density battery core can be well solved.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of diaphragms for batteries, and in particular relates to a preparation method of a special composite coating diaphragm for lithium batteries. Background technique [0002] At present, the demand for increasing the energy density of lithium batteries in the market is becoming increasingly strong, and the accompanying safety issues cannot be ignored. The single-material and simple-structure ceramic coating film based on polypropylene or polyethylene separator will not be able to meet the performance requirements of high-energy-density lithium batteries for high voltage, high safety and high cycle life due to their lack of comprehensive performance. . Therefore, there is an urgent need to develop a multifunctional composite coating separator for lithium batteries. [0003] In view of this, the present invention is proposed. Contents of the invention [0004] The technical problem to...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/451H01M50/457H01M50/491
CPCH01M50/403H01M50/409Y02E60/10
Inventor 詹孝军梁凯陈小平李小兵
Owner 桑顿新能源科技(长沙)有限公司
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