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:
Jun. 25, 2019
Filed:
Mar. 22, 2016
Nec Corporation, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Kenichi Shimura, Tokyo, JP;
Noboru Yoshida, Tokyo, JP;
Kazuhiko Inoue, Tokyo, JP;
Jiro Iriyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
The present invention relates to a lithium ion secondary battery comprising a positive electrode having a coating amount per unit area of 50 mg/cmor more and an electrode density of 3.3 g/cc or more and a negative electrode having a coating amount per unit area of 24 mg/cmor more and an electrode density of 1.5 g/cc or more, a separator having a shrinking ratio of 2% or less by heat treatment at 80° C. for 6 hours, and an electrolyte solution comprising at least one sulfonic acid ester compound, and a ratio of a sulfur content in the central portion (As) and a sulfur content in the edge portion (Bs) of the positive electrode and the negative electrode, in each, is 0.7≤As/Bs≤1.1.