| abstract |
Provided is a non-aqueous electrolyte capable of further improving battery characteristics in a lithium ion secondary battery, and a lithium ion secondary battery having excellent battery characteristics using such a non-aqueous electrolyte. Realize. A non-aqueous electrolyte used in a lithium ion secondary battery further contains lithium bis (oxalato) borate, divinyltetramethyldisiloxane, and a carbonic acid ester having a fluorine atom. [Selection figure] None |