In order to solve this problem, PMMA and PVDF are used together as polymer electrolyte matrix. PMMA is an amorphous polymer and it has excellent compatibility with PVDF [2,3]. An amorphous polymer can have a plasticization effect on the polymer [4,5]. In addition PMMA has the advantage of being easily obtained, low prices, and good compatibility with electrolyte. So the adding of PMMA will not only enhance the ionic conductivity but also can lower the production cost of polymer electrolyte [6].