公开(公告)号：US20230420726A1

公开(公告)日：2023-12-28

申请号：US18246290

申请日：2021-10-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： YUSUKE NAKAMURA ,  YUJI SONODA ,  YASUYUKI ITO

IPC: H01M10/0525 ,  H01M4/66

CPC classification number: H01M10/0525 ,  H01M2004/027 ,  H01M4/663

Abstract: An electrochemical device includes: an electrode body including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode; and an electrolyte containing a lithium salt. The negative electrode includes a negative current collector and a negative electrode mixture layer supported on the negative current collector. The negative electrode mixture layer contains a negative electrode active material that is reversibly doped with lithium ions, and the negative current collector has substantially no through-hole. A specific surface area of the negative electrode mixture layer is in a range from 30 m2/g to 60 m2/g, inclusive, and in a discharged state, a potential of the negative electrode is less than or equal to 0.2 V with respect to a Li counter electrode.