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. 15, 2012
Filed:
Nov. 12, 2008
Masanori Soma, Fukushima, JP;
Masayuki Ihara, Fukushima, JP;
Kenichi Kawase, Fukushima, JP;
Atsumichi Kawashima, Fukushima, JP;
Masanori Soma, Fukushima, JP;
Masayuki Ihara, Fukushima, JP;
Kenichi Kawase, Fukushima, JP;
Atsumichi Kawashima, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A positive-electrode active material for a lithium-ion secondary battery has an average composition expressed by the following formula (1):LiCoMCeOX  (1)wherein M represents at least one element selected from the group consisting of boron B, magnesium Mg, aluminum Al, silicon Si, phosphorous P, sulfur S, titanium Ti, chromium Cr, manganese Mn, iron Fe, cobalt Co, nickel Ni, copper Cu, zinc Zn, gallium Ga, yttrium Y, zirconium Zr, molybdenum Mo, silver Ag, tungsten W, indium In, tin Sn, lead Pb, and antimony Sb, X represents a halogen element, and x, y, z, a, and b satisfy 0.2<x≦1.2, 0≦y≦0.1, 0.5<z≦5.0, 1.8≦b≦2.2, and 0≦a≦1.0, respectively, and the concentration of cerium Ce is higher in the vicinity of the surface than in the inside.