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公开(公告)号：US20250023196A1
公开(公告)日：2025-01-16
申请号：US18686257
申请日：2022-08-17
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.
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公开(公告)号：US20230268487A1
公开(公告)日：2023-08-24
申请号：US17913393
申请日：2021-03-25
Inventor： Yusuke NAKAMURA , Shohei MASUDA , Yasuyuki ITO
CPC classification number: H01M4/366 , H01M4/0402 , H01M4/485 , H01M4/587 , H01M2004/027
Abstract: A negative electrode for an electrochemical device includes a negative electrode core material and a negative electrode material layer supported on the negative electrode core material. The negative electrode material layer contains a carbon material. A surface layer portion of the negative electrode material layer includes a first layer containing lithium carbonate and a second layer containing a solid electrolyte. At least a portion of the second layer covers at least a portion of the surface of the carbon material with the first layer interposed therebetween.
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