Solvent for Electrolyte Solution, Electrolyte Solution, and Gel-like Electrolyte

摘要

The invention provides a solvent for an electrolyte solution, an electrolyte solution, and a gel-like electrolyte superior in oxidation resistance and flame resistance. A solvent for an electrolyte solution comprising at least one boric ester represented by the following formula (I), and a boric ester represented by the following formula (II): B(OR_f)₃ (I); B(OCH₂CH₂CN)₃ (II) wherein, in formula (I), each R_f independently represents CH₂(CF₂)nCF₃ or CH(CF₃)₂, n is an integer from 0 to 6, and at least a part of each of —ORf and —OCH₂CH₂CN included in the boric esters is transesterified.