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|1. (WO2017204213) LITHIUM ION SECONDARY BATTERY|
|Title:||LITHIUM ION SECONDARY BATTERY|
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).