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. 05, 2002
Filed:
Mar. 15, 2001
Applicant:
Inventors:
Masaki Yoshio, Saga, JP;
Hideyuki Noguchi, Saga-ken, JP;
Yasufumi Hideshima, Saga, JP;
Hiroyoshi Nakamura, Yame, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01D 1/500 ; C01G 4/500 ; C01G 4/900 ; C01G 5/100 ; C01G 5/300 ;
U.S. Cl.
CPC ...
C01D 1/500 ; C01G 4/500 ; C01G 4/900 ; C01G 5/100 ; C01G 5/300 ;
Abstract
A manufacturing method of spinel type manganese oxide for a lithium ion secondary cell, includes pre-firing a mixture of lithium salt including lithium carbonate, manganese oxide, and heterogeneous metal, firing the mixture at 900 to 1200° C. to form a raw material, adding in the raw material at least one of crystal growth accelerators selected from the group consisting of lithium hydroxide, lithium sulfide and a mixture thereof, and firing the resulting compound at 750 to 850° C. to form an excess lithium heterogeneous metal-doped spinel compound having a BET specific surface area of 0.5 m /g or less.