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. 30, 2013
Filed:
May. 22, 2009
Yukiko Fujino, Kyoto, JP;
Yoshinobu Yasunaga, Kyoto, JP;
Akihiro Fujii, Kyoto, JP;
Yohei Shibata, Kyoto, JP;
Mariko Kohmoto, Kyoto, JP;
Takashi Egawa, Kyoto, JP;
Toru Tabuchi, Kyoto, JP;
Hiroe Nakagawa, Kyoto, JP;
Tokuo Inamasu, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
Yukiko Fujino, Kyoto, JP;
Yoshinobu Yasunaga, Kyoto, JP;
Akihiro Fujii, Kyoto, JP;
Yohei Shibata, Kyoto, JP;
Mariko Kohmoto, Kyoto, JP;
Takashi Egawa, Kyoto, JP;
Toru Tabuchi, Kyoto, JP;
Hiroe Nakagawa, Kyoto, JP;
Tokuo Inamasu, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
GS Yuasa International Ltd., Kyoto, JP;
Abstract
The invention provides a polyanion-based positive active material which can improve storage stability (especially, high temperature storage stability), charge and discharge cycle performance and the like of a lithium secondary battery, and a lithium secondary battery using the same. The positive active material for a lithium ion secondary battery contains lithium iron cobalt phosphate represented by the general formula: LiFeCoPO(0<x≦0.019, 0≦y≦1.2). By using the positive active material for a lithium secondary battery, high temperature storage stability and charge and discharge cycle performance can be improved in comparison with a case where LiFePOcontaining no Co is used. By using the positive active material, a lithium ion secondary battery can be suitable for applications in fields of electric automobiles and industrial batteries in which long lives, high capacities, and high output powers are required.