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:
Dec. 29, 2009
Filed:
Nov. 26, 2008
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. The central portion occupies 80 to 99% of a distance from a center to an outermost surface of the particle and the surface portion occupies 20 to 1% of the distance. The central portion includes LiMDO(M represents Co or Ni, D represents a transition metal element or Al replacing a part of Co or Ni as M, and M is not the same as D) having an α-NaFeOstructure. The surface portion includes LiMEO(M represents Co or Ni, E represents a metal element replacing a part of Co or Ni as M, and M is not the same as E) having an α-NaFeOstructure. The content of element E in the central portion satisfies the relation of E/(M+D+E)<0.05 in terms of an atomic ratio, and the content of element D in the surface portion satisfies the relation of D/(M+D+E)<0.05 in terms of an atomic ratio.