公开(公告)号：US20240076419A1

公开(公告)日：2024-03-07

申请号：US18489461

申请日：2023-10-18

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shida LI ,  Qineng ZHONG ,  Limei YANG ,  Yichen WU ,  Yifan XUE

IPC: C08F2/12 ,  C08F8/30 ,  H01M10/04

CPC classification number: C08F2/12 ,  C08F8/30 ,  H01M10/04

Abstract: A composite polyimide separator and a preparation method thereof, and a secondary battery are described. The preparation method of the composite polyimide separator comprises: providing a porous polyamic acid film; subjecting a diamine aqueous solution and an acyl chloride organic solution to an interfacial polymerization reaction on a surface of the porous polyamic acid film to obtain a composite polyamic acid separator; and placing the composite polyamic acid separator in vapor of an imidization reagent for imidization treatment to obtain the composite polyimide separator. In the present application, by controlling the parameters of the interfacial polymerization reaction, a composite polyamic acid separator with a dense surface, a loose bottom, and an adjustable surface pore size can be obtained.