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:
Aug. 05, 2014
Filed:
Jan. 23, 2009
Maiko Sakai, Tsukuba, JP;
Taketsugu Yamamoto, Tsukuba, JP;
Masami Makidera, Tsukuba, JP;
Satoru Kuze, Tsukuba, JP;
Takeshi Hattori, Abiko, JP;
Maiko Sakai, Tsukuba, JP;
Taketsugu Yamamoto, Tsukuba, JP;
Masami Makidera, Tsukuba, JP;
Satoru Kuze, Tsukuba, JP;
Takeshi Hattori, Abiko, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
Disclosed are a positive electrode active material and a method for producing an olivine-type phosphate. The positive electrode active material comprises an olivine-type phosphate represented by the following formula (I), wherein the maximum peak in an X-ray diffraction pattern obtained using a CuKα ray is the peak of the (031) plane of the olivine-type phosphate and the half-value width of the peak is 1.5° or less: AMPO(I), wherein A represents one or more elements selected from among alkali metals; M represents one or more elements selected from among transition metals; a is from 0.5 to 1.5; and b is from 0.5 to 1.5. The method for producing an olivine-type phosphate comprises preparing a raw material comprising element A, element M, and phosphorus (P) so that a A:M:P molar ratio may be a:b:1, preliminary calcining the raw material, and mainly calcining the preliminary calcined raw material.