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:
Oct. 08, 2013
Filed:
Nov. 11, 2008
Daisuke Endo, Kyoto, JP;
Miki Yasutomi, Kyoto, JP;
Yoshihiro Katayama, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
Daisuke Endo, Kyoto, JP;
Miki Yasutomi, Kyoto, JP;
Yoshihiro Katayama, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
GS Yuasa International Ltd., Kyoto-Shi, JP;
Abstract
The active material for a lithium secondary battery includes a solid solution of a lithium transition metal composite oxide having an α-NaFeOtype crystal structure, in which the composition ratio of Li, Co, Ni, and Mn contained in the solid solution satisfies LiCoNiMn(x+y≦1, 0≦y and 1−x−y=z); in an Li[LiMn]O(x)-LiNiMnO(y)-LiCoO(z) type ternary phase diagram, (x, y, z) is represented by values in a range present on or within a line of a heptagon (ABCDEFG) defined by the vertexes; point A(0.45, 0.55, 0), point B(0.63, 0.37, 0), point C(0.7, 0.25, 0.05), point D(0.67, 0.18, 0.15), point E(0.75, 0, 0.25), point F(0.55, 0, 0.45), and point G(0.45, 0.2, 0.35); and the intensity ratio between the diffraction peaks on (003) plane and (104) plane measured by X-ray diffractometry before charge-discharge is I/I≧1.56 and at the end of discharge is I/I>1.