The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2025
Filed:
Jul. 16, 2020
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Takakazu Hirose, Annaka, JP;
Reiko Sakai, Takasaki, JP;
Yusuke Osawa, Annaka, JP;
Takumi Matsuno, Annaka, JP;
Kohta Takahashi, Takasaki, JP;
Katsunori Nishiura, Chiba, JP;
Nan Fang, Ichihara, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
A negative electrode active material including negative electrode active material particles, wherein the negative electrode active material particles contain silicon compound particles containing a silicon compound, the silicon compound particles contain LiSiO, at least a part of a surface of the silicon compound particles is covered with a carbon layer, and a surface layer of the negative electrode active material particles contains a substance having a carboxylic acid structure. Provided by this configuration is a negative electrode active material capable of increasing battery capacity due to improved initial efficiency and capable of realizing satisfactory battery cycle characteristics.