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:
May. 11, 2021
Filed:
Apr. 10, 2017
Shin-etsu Chemical Co., Ltd., Tokyo, JP;
Takakazu Hirose, Annaka, JP;
Hiromichi Kamo, Takasaki, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
Abstract
A negative electrode active material includes a negative electrode active material particle. The negative electrode active material particle includes a silicon compound particle including a silicon compound (SiO: 0.5≤x≤1.6). The silicon compound particle includes crystalline LiSiOin at least part of the silicon compound particle. Among peak intensities A derived from LiSiO, B derived from Si, a peak intensity C derived from LiSiO, and D derived from SiOwhich are obtained from aSi-MAS-NMR spectrum of the silicon compound particle, the peak intensity C is the highest intensity, and the peak intensity A and the peak intensity C satisfy a relationship of the formula A<C/3. Thus, a negative electrode active material stabilizes a slurry prepared when a negative electrode of a secondary battery is prepared, and improves initial charge and discharge and cycle characteristics when used as a negative electrode active material for a secondary battery.