Patent ID: 7709153

Claim:
A polymer electrolyte system comprising: a) a multi-component composite separator comprising: i) a porous support layer film; and ii) a porous gellable polymer layer which is formed on one side or both sides of the support layer film, wherein the porous support layer film and gellable layer have a different pore size and are joined directly to each other, b) a liquid electrolyte comprising, i) a salt represented by Formula 1; and, ii) an organic solvent: A + B − Formula 1 wherein, A + is at least one selected from the group consisting of alkali metallic cations including Li + , Na + , and K, and a derivative thereof; and B − is at least one selected from the group consisting of PF 6 − , BF 4 − , Cl − , AsF 6 − , CH 3 CO 2 − , CF 3 SO 3 − , N(CH 3 SO 2 ) 2 − , and C(CH 3 SO 2 ) 3 − .