| abstract |
An electrolyte solution containing a solvent. The solvent contains a compound (1) represented by the following formula (1), wherein R a , R b , R c , and R d are the same as or different from each other, and are each —H, —F, —CH 3 , or —CF 3 ; at least one of R a , R b , R c , or R d is —F or —CF 3 ; and at least one of R a , R b , R c , or R d is —CH 3 , and a compound (2) represented by the following formula (2), wherein R e is a C1-C5 linear or branched alkyl or alkoxy group optionally containing an ether bond; R f is a C1-C5 linear or branched alkyl group optionally containing an ether bond; and at least one of R e or R f contains a fluorine atom. Also disclosed is an electrochemical device including the electrolyte solution, a lithium-ion secondary battery including the electrolyte solution and a module including the electrochemical device. |