公开(公告)号：US20240339731A1

公开(公告)日：2024-10-10

申请号：US18622071

申请日：2024-03-29

Applicant: Ningde Amperex Technology Limited

Inventor： Mingchang ZHU ,  Dongyang GUO ,  Qingwen ZHANG ,  Minjing CHEN

IPC: H01M50/491 ,  H01M50/417 ,  H01M50/44 ,  H01M50/454

CPC classification number: H01M50/491 ,  H01M50/417 ,  H01M50/44 ,  H01M50/454

Abstract: A separator includes a porous substrate and an inorganic coating layer disposed on at least one surface of the porous substrate. The porous substrate includes fibers. The fibers are made of a material including at least one of polyethylene or polypropylene. A diameter of the fibers is 0.01 μm to 0.70 μm. A diameter difference between any two fibers ranges from 0 μm to 0.40 μm. The inorganic coating layer includes a polymer and inorganic particles. The polymer includes at least one of styrene-butadiene rubber, a polyacrylate ester, or a polyolefin. The polymer can be modified by a functional group. The modifying functional group includes at least one of —OH, —COOH, or —NH. The above settings improve the infiltration effect of the electrolyte solution for the separator and the capability of the separator in retaining the electrolyte solution, thereby improving the cycle performance of the electrochemical device.