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. 05, 2011
Filed:
Jul. 09, 2008
Teruaki Yamamoto, Osaka, JP;
Shinichi Waki, Osaka, JP;
Yasuhiko Bito, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
The invention includes, as a positive electrode material, active material particles comprising a lithium-containing manganese oxide represented by the general formula: LiMnMOwhere M is a transition metal element other than Mn, 0<x≦0.5, −0.2≦y≦0.5, and 0≦a≦0.33. The molar ratio A of M to the total of Mn and M in the surface of the active material particles and the molar ratio B of M to the total of Mn and M in the whole active material particles satisfy the relations: A/B>1.0 and A≧0.3. In an X-ray diffraction analysis using CuKa radiation as an X-ray source, the intensity ratio of the largest peak of peaks attributed to an oxide of the transition metal element M to a peak around 2θ=36.4° is 0.25 or less.