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:
Nov. 16, 1999
Filed:
Mar. 25, 1997
Takehito Mitate, Yamatotakada, JP;
Naoto Torata, Kitakatsuragi-gun, JP;
Tetsuya Yoneda, Nabari, JP;
Kazuaki Minato, Osaka, JP;
Toyoshi Iida, Fukui, JP;
Tetsushi Makino, Fukui, JP;
Shigeyuki Hamano, Fukui, JP;
Naoyoshi Kameda, Fukui, JP;
Tomohiko Inada, Fukui, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Tanaka Chemical Corporation, Fukui, JP;
Abstract
A process for preparing lithium nickeloxide (LiNiO.sub.2) for use as a positive electrode active material for a nonaqueous secondary battery, which comprises the steps of: (a) using as the raw materials a lithium compound and a nickel compound at least one of which has a melting point not higher than 300.degree. C.; i) in case where both of the lithium compound and the nickel compound have a melting point not higher than 300.degree. C., mixing the above two compounds after their melting, or mixing the above compounds, melting the mixture and mixing the melted mixture; ii) in case where either one of the lithium compound and the nickel compound has a melting point higher than 300.degree. C., mixing said one having a melting point higher than 300.degree. C. with the remaining one before or after its melting; (b)calcining the resulting mixture at a temperature of 700.degree. C. to 950.degree. C. in air or in an atmosphere containing oxygen in a higher concentration than an atmospheric oxygen concentration.