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:
Feb. 26, 2008
Filed:
Feb. 23, 2005
Takanobu Chiga, Kobe, JP;
Katsunori Yanagida, San Diego, CA (US);
Atsushi Yanai, Kobe, JP;
Yoshinori Kida, Kobe, JP;
Takanobu Chiga, Kobe, JP;
Katsunori Yanagida, San Diego, CA (US);
Atsushi Yanai, Kobe, JP;
Yoshinori Kida, Kobe, JP;
SANYO Electric Co., Ltd., Osaka, JP;
Abstract
Cycle performance is improved without degrading initial efficiency of a non-aqueous electrolyte secondary battery that includes a positive electrode, a negative electrode, a non-aqueous electrolyte containing a solute and a solvent, the positive electrode including a positive electrode active material made of a lithium-containing transition metal oxide that contains lithium and cobalt and has a layered structure. The lithium-containing transition metal oxide is at least partially covered with a surface-treatment layer containing a phosphate compound represented by the chemical formula MPO, where Mis at least one element that can have a valency of 3 and k is an integer in a range of 2 to 4, and the lithium-containing transition metal oxide contains a group IVA element Mand a group IIA element Mof the periodic table.