Electrolyte electrochemical device, the lithium ion secondary battery, and the module

Providing suppress electrolyte gas generation. A non-aqueous solvent (I), and an electrolyte salt (II), a compound represented by the general formula (1) (III) and an electrolyte solution which comprises a. [Formula 1] (Wherein, Rf is selected from the group consisting linear or branched fluorinated alkyl group having 1 to 20 carbon atoms, or, .R representing a fluorinated alkyl group having 3 to 20 carbon atoms containing a cyclic structure, a linear Jo or branched alkylene group having 1 to 20 carbon atoms, or a part or all of the hydrogen atom of the .R representing an alkylene group having 3 to 20 carbon atoms containing a cyclic structure is substituted by a fluorine atom both also good .Rf and R, when the number is 2 or more carbon atoms, unless between oxygen atoms are not adjacent to one another, may contain an oxygen atom between carbon atoms.)