A preparation method of a battery composite separator
A composite separator and battery technology, applied in battery pack components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of high temperature resistance of battery separators and poor affinity of electrolyte, and improve thermal stability. properties and mechanical strength, improving heat resistance and electrolyte affinity, and improving high-current charge-discharge performance
Inactive Publication Date: 2019-01-04
FOSHAN WANHE NEW ENERGY TECH CO LTD
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Problems solved by technology
[0006] The technical problem to be solved by the present invention: Aiming at the problems of the existing battery separators such as high temperature resistance and poor electrolyte affinity, a method for preparing battery composite separators is provided
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[0020] Take a high-purity aluminum sheet with a thickness of 0.05-0.1mm and ultrasonically clean it with acetone and deionized water for 15-20 minutes, respectively, and then electrolytically polish it at a voltage of 16-18V and a temperature of 10-15°C for 5-7 minutes. Wash with deionized water for 1 to 3 times to obtain a polished aluminum sheet. Put the polished aluminum sheet into a 0.3mol / L sulfuric acid solution for the first anodic oxidation. The oxidation process conditions are: 25V, 6~10°C, 2~3h , to obtain a primary alumina film, the volume ratio of the primary alumina film is 1:1 and the mass fraction is 6%H 3 PO 4 and a mass fraction of 1.8%H 2 CrO 4 After being corroded in the mixed solution for 3 to 4 hours, the secondary anodic oxidation is carried out. The conditions of the secondary anodic oxidation are the same as those of the primary anodic oxidation. ~100 mesh sieve to obtain ceramic powder, evenly coat the ceramic powder between two layers of porous fil...
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Abstract
The invention discloses a preparation method of a battery composite separator, belonging to the technical field of lithium ion batteries. The invention combines the organic material polypropylene filmand the inorganic ceramic material to prepare a composite diaphragm, the organic material endows the composite diaphragm with enough flexibility, under the high temperature condition, the organic component melts to block the diaphragm pore passage, endows the composite diaphragm with the function of closing the pore, and prevents the battery from short circuit; Inorganic ceramic materials are distributed in the three-dimensional structure of the composite diaphragm to form a specific rigid skeleton, which can effectively prevent the diaphragm from shrinking and melting under the condition ofhigh thermal stability and improve the safety of the battery. The composite ceramic diaphragm with sandwich structure is prepared by a hot rolling process, and the ceramic particle layer is confined between the two-layer polypropylene films, thus effectively avoiding the peeling off of the ceramic particles, improving the thermal stability and mechanical strength of the diaphragm, and improving the heat resistance and electrolyte affinity of the polypropylene film by the ceramic layer.
Description
technical field [0001] The invention relates to a preparation method of a battery composite separator, which belongs to the technical field of lithium ion batteries. Background technique [0002] With the rapid development of the IT electronics industry, new energy vehicles, and energy storage industries, the secondary power supply is showing a vigorous development trend. As one of the key materials of secondary power supply, the battery diaphragm plays an increasingly important role, so the manufacture of battery diaphragm materials has attracted more and more attention. [0003] At present, the preparation methods of secondary battery separator materials mainly include phase inversion method, dissolution method, stretching method, fiber dry carding, fiber wet papermaking molding, etc., among which phase inversion method, dissolution method and stretching method are mainly used to prepare lithium ion Battery diaphragm, this type of battery diaphragm has a two-dimensional s...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/434H01M50/451H01M50/457H01M50/489
CPCH01M50/409H01M50/403Y02E60/10
Inventor 裘友玖张鑫
Owner FOSHAN WANHE NEW ENERGY TECH CO LTD