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:
Apr. 10, 2012
Filed:
Feb. 27, 2008
Denis Yau Wai Yu, Moriguchi, JP;
Kazunori Donoue, Moriguchi, JP;
Toshikazu Yoshida, Moriguchi, JP;
Tetsuo Kadohata, Moriguchi, JP;
Tetsuyuki Murata, Moriguchi, JP;
Shigeki Matsuta, Moriguchi, JP;
Denis Yau Wai Yu, Moriguchi, JP;
Kazunori Donoue, Moriguchi, JP;
Toshikazu Yoshida, Moriguchi, JP;
Tetsuo Kadohata, Moriguchi, JP;
Tetsuyuki Murata, Moriguchi, JP;
Shigeki Matsuta, Moriguchi, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as LiPOor LiCO, or a substance, other than LiFePO, in which the valence of Fe is bivalent such as FeSO, FeO or Fe(PO)without dissolving Fe of LiFePO.