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:
Jul. 12, 2005
Filed:
Apr. 16, 2001
Atsushi Funabiki, Kyoto, JP;
Hideo Yasuda, Kyoto, JP;
Atsushi Funabiki, Kyoto, JP;
Hideo Yasuda, Kyoto, JP;
Japan Storage Battery Co., Ltd., Kyoto, JP;
Abstract
The positive active material for a secondary battery of the present invention is β-FeOOH containing at least one element selected from the group consisting of B, P, S, Li, Na, K, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Zr, Pb and Sn which shows a diffraction peak from the () plane having a half width Y satisfying 0.3°<Y (2θ) when subjected to the X-ray diffractometry with the CuKα ray. A non-aqueous electrolyte secondary battery comprising as a positive active material such low-crystalline β-FeOOH exhibits an excellent cycle life performance as compared with a non-aqueous electrolyte secondary battery comprising a high-crystalline β-FeOOH as a positive active material.