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, 2019
Filed:
Mar. 17, 2014
Sumitomo Chemical Company, Limited, Tokyo, JP;
Tokyo University of Science Foundation, Tokyo, JP;
Shinichi Komaba, Tokyo, JP;
Naoaki Yabuuchi, Tokyo, JP;
Masaya Yano, Imizu, JP;
Satoru Kuze, Tsukuba, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
TOKYO UNIVERSITY OF SCIENCE FOUNDATION, Tokyo, JP;
Abstract
A positive electrode-active material is provided for use in a positive electrode for a sodium secondary cell and a sodium secondary cell. Also provided is a positive electrode for a sodium secondary cell and a sodium secondary cell having a high energy density. The positive electrode-active material for a sodium secondary cell includes a composite metal oxide, which has an α-NaFeOtype crystal structure and is denoted by Formula (1) described below:Na(FeNiMnTi)O  (1),wherein a is greater than or equal to 0.6 and less than or equal to 1.0, w is greater than 0 and less than 0.5, x is greater than 0 and less than 0.5, y is greater than 0.03 and less than or equal to 0.5, z is greater than or equal to 0.03 and less than 0.5, and w+x+y=1.0, and y>z.