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:
Mar. 04, 2014
Filed:
Nov. 27, 2009
Yuta Kashiwa, Kyoto, JP;
Mariko Kohmoto, Kyoto, JP;
Toru Tabuchi, Kyoto, JP;
Tokuo Inamasu, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
Yuta Kashiwa, Kyoto, JP;
Mariko Kohmoto, Kyoto, JP;
Toru Tabuchi, Kyoto, JP;
Tokuo Inamasu, Kyoto, JP;
Toshiyuki Nukuda, Kyoto, JP;
GS Yuasa International Ltd., Kyoto, JP;
Abstract
It is an object of the present invention to provide a positive electrode material having a large ratio of the discharge capacity around 4 V to the total discharge capacity including the discharge capacity at 4V or lower while making the discharge capacity around 4 V sufficient, for the purpose of providing a lithium secondary battery using a lithium transition metal phosphate compound excellent in thermal stability, utilizing the discharge potential around 4V (vs. Li/Li) that is higher than the discharge potential of LiFePO, and being advantageous with respect to the detection of the end of discharge state, and a lithium secondary battery using the same. The present invention uses a positive active material for a lithium secondary battery containing a lithium transition metal phosphate compound represented by LiMnFeCoPO(0.1≦x≦0.2, 0<y≦0.2).