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:
Jun. 25, 2002
Filed:
Jun. 17, 1997
Koji Hattori, Shiga-ken, JP;
Yasuhisa Yamashita, Shiga-ken, JP;
Abstract
The invention provides a spinel-type lithium manganese complex oxide for use as a cathode active material of a lithium secondary battery, which is characterized in that said spinel-type lithium manganese complex oxide has an average particle diameter between about 1 and 5 micrometers and a specific surface area between about 2 and 10 m /g. The invention also provides a process for producing the spinel-type lithium manganese complex oxide comprises the steps of l)atomizing and pyrolyzing an aqueous or alcohol solution of compounds containing metallic salts constituting a spinel-type lithium manganese complex oxide to obtain said complex oxide, and 2) annealing said spinel-type lithium manganese complex oxide to increase the average particle diameter thereof to between about 1 and 5 micrometers and adjust the specific surface area thereof to between about 2 and 10 m /g. The spinel-type lithium manganese complex oxide exhibits a large charge-discharge capacity and excellent charge-discharge cycle characteristics, and it can be used in a 4-V region secondary battery.