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:
Apr. 13, 2021
Filed:
Sep. 05, 2018
Kabushiki Kaisha Toshiba, Minato-ku, JP;
Toshiba Infrastructure Systems & Solutions Corporation, Kawasaki, JP;
Taro Fukaya, Tokyo, JP;
Takashi Kishi, Yokosuka, JP;
Kazuki Ise, Kawasaki, JP;
Kazuomi Yoshima, Yokohama, JP;
Yasunobu Yamashita, Tokyo, JP;
Yasuhiro Harada, Isehara, JP;
Norio Takami, Yokohama, JP;
KABUSHIKI KAISHA TOSHIBA, Minato-ku, JP;
Toshiba Infrastructure Systems & Solutions Corporation, Kawasaki, JP;
Abstract
According to one embodiment, a secondary battery is provided. The secondary battery includes a negative electrode. The negative electrode includes an active material composite. The active material composite includes active material particles and a layer covering at least a portion of surfaces of the active material particles. The active material particles include titanium-containing oxide particles. The layer contains N and Si. The layer includes a first surface facing the at least the portion of surfaces of the active material particles and a second surface defining a layer thickness from the first surface. An N concentration in the layer decreases from the first surface to the second surface. A Si concentration in the layer increases from the first surface to the second surface.