公开(公告)号：US20250023196A1

公开(公告)日：2025-01-16

申请号：US18686257

申请日：2022-08-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shohei MASUDA ,  Kenichi NAGAMITSU ,  Nobuhiro SHIMAMURA ,  Nobutaka TAKEDA ,  Hideo SAKATA

IPC: H01M50/489 ,  H01M4/02 ,  H01M4/583 ,  H01M10/0525 ,  H01M50/417

Abstract: A disclosed electrochemical device includes a positive electrode, a negative electrode, an olefin-based separator, and a lithium ion-conductive electrolyte. The negative electrode includes a negative electrode current collector, and a negative electrode material layer supported on the negative electrode current collector. The negative electrode material layer includes a negative electrode active material into which lithium ions are reversibly doped. A surface layer portion of the negative electrode material layer has a film region, and when the film region is measured by X-ray photoelectron spectroscopy, a peak in an O1s spectrum is observed in a binding energy range of 530 to 534 eV. The peak intensity in the O1s spectrum increases from the surface layer of the film region to the inner side.