| abstract |
An electrolyte having an excellent long period reliability, a high withstand voltage (wide potential window), a high conductivity is provided. The invention is an electrolyte includes a quaternary ammonium salt representing in formula (1) as shown, wherein R1 represents alkyl, R2 represents alkyl, hydrogen atom or halogen atom, R3 to R14 represent alkyl, fluoroalkane, hydrogen atom or halogen atom, C and C* represent carbon atom, N represents hydrogen atom, h, I, j, x, y and z represent the integer of 0 to 6, (h+x) represents the integer of 0 to 6, (i+y) and (j+z) represent the integer of 1 to 6, X- represents counter anion. The HOMO energy calculated from 1st principal molecular orbit of the counter anion ranges from -0.60 a.u. to -0.2 a.u. |