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, 2002
Filed:
Oct. 01, 1999
Naoto Torata, Kashihara, JP;
Takehito Mitate, Yamatotakada, JP;
Toyoshi Iida, Fukui, JP;
Tetsushi Makino, Fukui, JP;
Shigeyuki Hamano, Fukui, JP;
Tomohiko Inada, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A process for producing a positive electrode active material for a nonaqueous secondary battery comprising the steps of: dissolving, in an alcohol as a medium, a starting material which contains metals necessary for giving a compound represented by the formula LiNi M O , wherein 0≦X<0.5 and M is at least one metal selected from transition metals and 3B-, 4B- and 5B-group elements, as a positive electrode active material, and which is soluble in the alcohol; adding a sufficient amount of oxalic acid to the resulting solution to produce a precipitate slightly soluble in the alcohol: separating the slightly soluble precipitate from the solution: and calcining the precipitate to obtain the positive electrode active material.