Coated diaphragm with high liquid storage rate as well as preparation method and application thereof

A technology with high liquid storage rate and liquid storage rate, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of reducing battery electrical performance and increasing battery internal resistance, so as to improve electrical performance and increase liquid storage rate Effect
CN113258211AInactive Publication Date: 2021-08-13JIANGSU HORIZON NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HORIZON NEW ENERGY TECH CO LTD
Publication Date
2021-08-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a coated diaphragm with a high liquid storage rate, which comprises a base membrane and a coating compounded on the surface of the base membrane. The coating is prepared from a binder containing pressure-resistant particles, and the pressure-resistant particles comprise one or more of a polyacrylate binder, PVDF, SBR, aramid fibers, polyacrylonitrile and polyacrylic acid. The particle size of the pressure-resistant particles is 0.2-10 [mu] m. The compression ratio of the coating ranges from 0.4 to 0.99. According to the invention, a relatively high coating compression ratio is obtained through a special coating design, and the liquid storage rate of the diaphragm is greatly improved while the adhesive force of the diaphragm and a pole piece is maintained, so that the electrical performance of a battery is improved.
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Description

technical field

[0001] The invention belongs to the technical field of new energy, and in particular relates to a high liquid storage rate coated diaphragm, its preparation method and application. Background technique

[0002] The new energy industry is developing rapidly. As an important carrier of new energy, lithium batteries are widely used, and their performance and safety have attracted more and more attention. During the charging and discharging process of lithium batteries, the volume will periodically expand and shrink with charging and discharging, and gaps are likely to be formed between the pole pieces and the diaphragm. These gaps have a high risk of lithium analysis and reduce the cycle life of the battery. Therefore, the industry Neiduo uses a binder coating on the surface of the separator to increase the adhesion between the separator and the pole piece and reduce the negative impact of volume changes on battery performance.

[0003] The main components of t...

Claims

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