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. 26, 2016
Filed:
Apr. 27, 2012
Jiro Iriyama, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
Kazuhiko Inoue, Tokyo, JP;
Jiro Iriyama, Tokyo, JP;
Tetsuya Kajita, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Tatsuji Numata, Tokyo, JP;
Kazuhiko Inoue, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
Provided is a negative electrode active material for a lithium secondary cell, the material having the function of a binder for the active material, and being capable of stable reversible reactions with lithium. Also, provided are an extended-life lithium secondary cell having improved energy density and stable charge/discharge, and a method for producing the same. The negative electrode active material for a lithium secondary cell is polyimide represented by formula (1) (wherein R1 and R2 independently denote an alkyl, alkoxy, acyl, phenyl, or phenoxy group).