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1. (WO2017204213) LITHIUM ION SECONDARY BATTERY

Pub. No.:    WO/2017/204213    International Application No.:    PCT/JP2017/019184
Publication Date: Fri Dec 01 00:59:59 CET 2017 International Filing Date: Wed May 24 01:59:59 CEST 2017
IPC: H01M 10/052
H01M 4/134
H01M 4/38
H01M 4/62
H01M 10/0567
H01M 10/0568
Applicants: NEC CORPORATION
日本電気株式会社
Inventors: SHIMANUKI, Ikiko
島貫 伊紀子
KAWASAKI, Daisuke
川崎 大輔
ISHIKAWA, Hitoshi
石川 仁志
TAMAI, Suguru
玉井 卓
Title: LITHIUM ION SECONDARY BATTERY
Abstract:
Provided is a lithium ion secondary battery which has high energy density and excellent cycle characteristics. The present invention relates to a lithium ion secondary battery which is provided with: a negative electrode that contains a negative electrode active material containing more than 25% by weight of a silicon alloy; and a nonaqueous electrolyte solution that contains more than 10% by weight of a compound represented by LiN(SO2CnF2n+1)2 (wherein n represents an integer of 0 or more) and 10% by weight or more of fluoroethylene carbonate (FEC).