Highly conductive heat-resistant composite diaphragm and preparation method thereof

By employing a step-by-step coating process on lithium-ion battery separators to form a composite coating of solid electrolyte dot coating and ceramic coating, the problem of balancing heat resistance and ion conductivity in lithium-ion battery separators is solved. This achieves efficient lithium-ion conductivity and improved heat resistance, making it suitable for mass production.

CN122246418APending Publication Date: 2026-06-19HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
Filing Date
2026-04-22
Publication Date
2026-06-19

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Abstract

This invention relates to the field of battery separator technology, and proposes a high-conductivity and heat-resistant composite separator and its preparation method. The high-conductivity and heat-resistant composite separator includes a base film and a composite coating disposed on at least one side of the base film; the composite coating includes a ceramic coating and a solid electrolyte dot coating; both the ceramic coating and the solid electrolyte dot coating are in contact with the surface of the base film, and at least a portion of the solid electrolyte dot coating is located inside the ceramic coating. This technical solution solves the problem in related technologies where battery separators exhibit poor heat resistance and ion conductivity, and it is difficult to achieve both simultaneously.
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