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. 11, 2006
Filed:
Oct. 15, 2002
Takehiro Noguchi, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
Takehiro Noguchi, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A positive electrode active material for a secondary battery contains a spinel lithium manganese composite oxide expressed by a general formula of Li(MMnA)Owhere x and y are positive values which satisfy 0.4<x, 0<y, x+y<2, and 0<a<1.2. 'M' denotes Ni and at least one metal element selected from the group consisting of Co, Fe, Cr and Cu. 'A' denotes at least one metal element selected from the group consisting of Si and Ti. The ratio y of A has a value of 0.1<y in case where A includes only Ti. Accordingly, it is possible to acquire a material for the positive electrode of a lithium ion secondary battery, which has a high capacity and a high energy density with a high voltage of 4.5 V or higher with respect to Li.