PAA-based three-dimensional network composite ceramic diaphragm for lithium ion battery and preparation method of PAA-based three-dimensional network composite ceramic diaphragm

By forming carbonyl functional groups on the surface of PP separators and using water-based PAA binders to composite with LATP particles, the limitations of high-temperature melting of polyolefin separators and PVDF binders are solved, thereby improving the stability of the separator and the performance of the battery at high temperatures.

CN121840101APending Publication Date: 2026-04-10NANJING TECH UNIV
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-01
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

Existing polyolefin separators for lithium-ion batteries melt at high temperatures, posing a safety hazard. Furthermore, traditional PVDF binders suffer from environmental unfriendliness, high cost, weak interaction with ceramic particles, and uneven distribution.

Method used

Carbonyl functional groups were formed on the surface of polypropylene (PP) membrane by oxidation treatment, and PP-O@LATP composite membrane was prepared by combining it with lithium-ion conductive ceramic particles using water-based polyacrylic acid (PAA) binder.

Benefits of technology

It improves the hydrophilicity and mechanical properties of the separator, enhances the thermal stability and safety of the battery, strengthens the wettability and ionic conductivity of the electrolyte, reduces the battery interface impedance, and improves the cycle stability and energy density of the battery.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121840101A_ABST
    Figure CN121840101A_ABST
Patent Text Reader

Abstract

The invention relates to a PAA-based three-dimensional network composite ceramic diaphragm for a lithium ion battery and a preparation method of the PAA-based three-dimensional network composite ceramic diaphragm, and belongs to the technical field of lithium ion battery materials. A PP diaphragm is adopted as a substrate, LATP is adopted as a ceramic material, the preparation technology of the composite ceramic diaphragm based on the oxidized PP diaphragm adaptive to the water-based PAA binder is provided, the PP diaphragm is oxidized through a KMnO4 solution, a large number of carbonyl groups exist on the surface of the PP diaphragm, the hydrophilicity of the PP diaphragm is improved, the PP-O-LATP composite diaphragm is prepared by using the PAA binder, and the preparation process is simple and convenient. And an effective solution is provided for improving the safety and the cycling stability of the lithium ion battery.
Need to check novelty before this filing date? Find Prior Art