公开(公告)号：US20250158222A1

公开(公告)日：2025-05-15

申请号：US18508844

申请日：2023-11-14

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Nathaniel HARDIN ,  Fang Dai ,  Xingcheng Xiao ,  YIfan Zhao

IPC: H01M50/417 ,  C08J3/28 ,  C08J5/18 ,  H01M10/0525 ,  H01M10/0585 ,  H01M50/403 ,  H01M50/434 ,  H01M50/446 ,  H01M50/449 ,  H01M50/489

Abstract: A battery that cycles lithium ions includes a negative electrode, a positive electrode, and a separator sandwiched between opposed major facing surfaces of the negative and positive electrodes. The separator has an open microporous structure and includes a polyolefin having a crosslinked structure. When the separator is heated at a temperature of greater than or equal to about 145 degrees Celsius for about 1 hour, the separator has thermal shrinkage in directions parallel to the opposed major facing surfaces of the negative and positive electrodes of less than or equal to about 5%. The separator may be manufactured from a precursor film having an open microporous structure and comprising linear or branched chain polyolefin molecules. The precursor film may be exposed to a source of free radicals such that covalent bonds form between the polyolefin molecules and form a crosslinked polyolefin having a relatively high molecular weight.