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, 2013
Filed:
Oct. 12, 2010
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
A process for producing a lithium secondary battery employs a charging method where a positive electrode upon charging has a maximum achieved potential of 4.3 V (vs. Li/Li+) or lower. The process includes charging the lithium secondary battery to reach at least a region with relatively flat fluctuation of potential appearing in a positive electrode potential region exceeding 4.3 V (vs. Li/Li) and 4.8V (vs. Li/Li) or lower. The lithium secondary battery includes an active material having a solid solution of a lithium transition metal composite oxide having an α-NaFeOtype crystal structure. 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).