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:
Aug. 18, 2020
Filed:
Mar. 16, 2012
Makiko Uehara, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Takehiro Noguchi, Tokyo, JP;
Akinobu Nakamura, Tokyo, JP;
Kenichi Shimura, Tokyo, JP;
Yoko Hashizume, Tokyo, JP;
Makiko Uehara, Tokyo, JP;
Daisuke Kawasaki, Tokyo, JP;
Takehiro Noguchi, Tokyo, JP;
Akinobu Nakamura, Tokyo, JP;
Kenichi Shimura, Tokyo, JP;
Yoko Hashizume, Tokyo, JP;
NEC CORPORATION, Minato-ku, Tokyo, JP;
Abstract
The object is to provide a lithium ion secondary battery which has an excellent cycle property even in high-temperature environment and which has small volume increase. An exemplary embodiment of the invention is a lithium ion secondary battery, comprising: a positive electrode, a negative electrode comprising a negative electrode active material, and an electrolyte liquid; wherein the electrolyte liquid comprises a chain-type fluorinated ester compound represented by a predetermined formula and a chain-type fluorinated ether compound represented by a predetermined formula; wherein the negative electrode active material comprises metal (a) that can be alloyed with lithium, metal oxide (b) that can absorb and desorb lithium ion, and carbon material (c) that can absorb and desorb lithium ion; and wherein metal (a) is silicon, and metal oxide (b) is silicon oxide.