SEBS ionomer for polymer electrolyte was prepared with ion capacitance. Sulfonated-SEBS was enough to use for polymer electrolyte membrane. Sulfonated-SEBS/SiO2/plasticizer composite polymer electrolyte for polymer battery was fabricated with fumed silica. LiClO4 or LiCF3SO3 used as a salt, EC/PC (1:1) as solvents, SiO2 as a filler, and DBP as a plasticizer, respectively. The ionic conductivity is enhanced with increasing the content of silica. However, if the content of silica is too much, the ionic conductivity is decreased due to the restriction of ionic movement. The ionic conductivity is showed up to 2.6×10(-3) S/cm when the content of silica was 10 wt% and the LiClO4 used as a salt.