High-temperature-resistant ceramic coating slurry and application thereof

By constructing an interpenetrating network structure on the porous isolation membrane with a high-temperature resistant ceramic coating slurry, the problem of insufficient heat resistance of the PE ceramic coated membrane is solved, and the safety of the battery at high temperatures is improved.

CN120757326AActive Publication Date: 2025-10-10宁波大浦新材料科技有限公司
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Patent Information

Application Number
CN202511269311.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-08
Publication Date
2025-10-10
Estimated Expiration
2045-09-08

AI Technical Summary

Technical Problem

The existing PE ceramic coated diaphragm has insufficient heat resistance, which causes the battery to shrink at high temperatures, resulting in internal short circuits and causing safety accidents.

Method used

A high-temperature resistant ceramic coating slurry, including ceramic particles, PAA binder, composite emulsion and wetting agent, is used to prepare ceramic particles through high-energy ball milling and modification treatment, and a ceramic coating is formed on the porous isolation membrane to construct an interpenetrating network structure to enhance the interface bonding force.

Benefits of technology

The heat resistance of the ceramic coating is significantly improved, and the thermal shrinkage of the diaphragm is less than 3% within 180℃/30min, which improves the safety of battery use.

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Abstract

The invention discloses high-temperature-resistant ceramic coating slurry and application thereof, and relates to the technical field of secondary batteries, the high-temperature-resistant ceramic coating slurry comprises ceramic particles, a PAA binder, a composite emulsion, a wetting agent and water as a solvent; the addition mass ratio of the ceramic particles to the PAA binder to the composite emulsion to the wetting agent is 1: (0.5-2): (5-10): (0.05-0.2); the adding mass percentage of the ceramic particles is 30-50%. The heat resistance of the prepared ceramic coating is remarkably improved, so that the effect of improving the use safety of the battery is achieved. Based on the corresponding components, the obtained ceramic coating forms a heat-resistant PAA framework and a composite body which are mixed to coat ceramic particles, and the effect of remarkably improving the heat resistance is further achieved.
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