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:
Feb. 16, 2021
Filed:
Nov. 30, 2017
Applicant:
Nec Corporation, Tokyo, JP;
Inventors:
Takehiro Noguchi, Tokyo, JP;
Takuya Hasegawa, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Ikiko Shimanuki, Tokyo, JP;
Assignee:
NEC CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01M 10/0569 (2010.01); H01M 10/0525 (2010.01); H01M 4/134 (2010.01); H01M 4/58 (2010.01);
U.S. Cl.
CPC ...
H01M 10/0569 (2013.01); H01M 4/134 (2013.01); H01M 4/5825 (2013.01); H01M 10/0525 (2013.01);
Abstract
A purpose of one embodiment of the present invention is to provide a lithium ion secondary battery that has improved life-span characteristics. The first lithium ion secondary battery of the present invention comprises an electrolyte solution comprising a sulfone compound, a fluorinated ether compound and LiN(FSO), and a negative electrode comprising a silicon material, wherein a content of LiN(FSO)in the electrolyte solution is more than 5 weight % and 20 weight % or less.