A single phase, solid, solvent-containing electrolyte which comprises:a solid polymeric matrix; an inorganic ion salt; and a solvent;wherein said solid polymeric matrix is obtained by polymerizing an organic monomer represented by Formula I: ##STR14## where R1, R2, and R3 are independently selected from the group consisting of (a) --Y--CH2 CH2)x H where x is an integer of 1 to 20, Y is O, S, NH, o