| 摘要 |
PROBLEM TO BE SOLVED: To heighten ion conductivity at low temperature by including at least one kind of cyclic ethers selected from a group comprising a specific material group and a derivative thereof, in a specific range in an organic solvent contained in a nonaqueous electrolyte impregnated in a polyelectrolyte. SOLUTION: A gel polyelectrolyte for a lithium secondary battery is formed by impregnating a nonaqueous electrolyte comprising lithium salt and an organic solvent, in an organic polymer with an ethylene oxide unit in a principal chain and/or a side chain, and the organic solvent contains 0.01-8 vol.% of at least one kind of cyclic ethers selected from a group comprising 12-crown-4, 15-crown-5, 18-crown-6, 1,3-dioxane, 1,4-dioxane and a derivative thereof. This results in obtaining the gel polyelectrolyte of high ion conductivity providing the lithium secondary battery with an excellent low temperature characteristic. |
