High-infiltration diaphragm with pore structure as well as preparation method and application of high-infiltration diaphragm

By introducing spherical inorganic particles and a specific process into the lithium-ion battery separator, a petal-shaped crystalline structure is formed, which solves the problem of poor separator wettability and improves battery performance and safety.

CN122051576APending Publication Date: 2026-05-15HEBEI 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
2026-01-31
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

The poor wettability of existing lithium-ion battery separators prevents the electrolyte from fully filling the separator pores, affecting lithium-ion transport, increasing battery internal resistance, reducing energy efficiency, and potentially leading to uneven current density distribution, dendrite growth, and short-circuit risks.

Method used

By introducing spherical inorganic particles into the diaphragm and using specific processes, a petal-shaped polyethylene crystalline structure is formed, thereby improving the wettability of the diaphragm.

Benefits of technology

It enhances the wettability of the separator, improves lithium-ion transport, reduces internal resistance, extends battery life, and reduces dendrite growth and short-circuit risk.

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Abstract

The invention relates to the technical field of battery diaphragms, and provides a high-infiltration diaphragm with a pore structure as well as a preparation method and application of the high-infiltration diaphragm. The invention discloses a high-infiltration diaphragm with a pore structure. The high-infiltration diaphragm is prepared from the following raw materials in parts by weight: 18-20 parts of ultra-high molecular weight polyethylene, 4.4-5.9 parts of spherical inorganic particles, 0.5-1 part of a coupling agent, 0.1-0.2 part of an antioxidant, 2-3 parts of maleic anhydride grafted polyethylene and 73-75 parts of paraffin oil, and the diameter of the spherical inorganic particles is 0.6-1 mu m. According to the technical scheme, the problem of insufficient wettability of the battery diaphragm in the prior art is solved.
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