| 摘要 |
PROBLEM TO BE SOLVED: To enhance the molding processing and strength, facilitate the handling, stably increase the ion conductivity, and improve the safety and reliability at low cost by adding a specified alumina fine particle having a high specific surface area and a low water content to a polymer solid electrolyte. SOLUTION: At least one alumina fine particle having a BET specific surface area of 50 m<2> /g or more, a maximum diameter of 5 μm or less and a water content (Karl Fischer titration value) of 3000 ppm or less is added to a polymer solid electrolyte containing at least one polymer and at least one electrolytic salt in an amount ranging from 1 to 50 wt.%. The water content (Karl Fischer value) is set to 200 ppm or less, and the free acid quantity (neutralization titration value) is set to 100 ppm or less. In this case, γ-alumina thermally treated at 600-120 deg.C is used as the alumina fine particle, and a one including oxyalkylene and/or urethane structure is contained as the polymer. |
