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:
Nov. 10, 2009
Filed:
Jun. 21, 2004
Kazunari Hagiwara, Shizuoka, JP;
Soichiro Kawakami, Nara, JP;
Katsuhiko Inoue, Fukui, JP;
Nobuyuki Suzuki, Kanagawa, JP;
Kazunari Hagiwara, Shizuoka, JP;
Soichiro Kawakami, Nara, JP;
Katsuhiko Inoue, Fukui, JP;
Nobuyuki Suzuki, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrode material for a lithium secondary battery which includes particles each having a central portion and a surface portion covering the surface of the central portion. A distance from a center to an outermost surface of the particle is occupied 80 to 99% by the central portion and 1 to 20% by the surface portion. The central portion includes LiMDOhaving an α-NaFeOstructure, and the surface portion includes LiMEOhaving an α-NaFeOstructure. (M is C or Ni; D is a transition metal element or Al replacing a part of Co or Ni as M; E is a metal element replacing a part of Co or Ni as M; and M is not the same as D or E.) The following relationships are satisfied in the central portion, in terms of atomic ratio: D/(M+D+E)<0.05 and E/(M+D+E)<0.05.