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. 04, 1998
Filed:
Sep. 20, 1996
Norikazu Adachi, Nagoya, JP;
Hisanao Kojima, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An active material for a positive electrode of a secondary cell comprises particles of a metal oxide and a conductive layer formed on the surfaces of individual particles of the metal oxide and made of a carbon powder which has a specific surface area of at least 150 m.sup.2 /g when measured prior to the formation of the conductive layer. The conductive layer covers at least 15% of an apparent surface of the individual particles of the metal oxide and has a thickness ranging from 0.01 .mu.m to 0.3 .mu.m. The active material has a specific surface area of 3.5 m.sup.2 /g to 100 m.sup.2 /g. A method for making the active material is also described along with a positive electrode comprising the active material and a non-aqueous electrolytic secondary cell comprising the positive electrode.