| 摘要 |
A gel electrolyte in which nonaqueous electrolytic solution having a lithium-containing electrolyte salt dissolved in a nonaqueous solvent is gelled by a matrix polymer. The gel electrolyte includes a halogen substituted ethylene carbonate obtained by replacing one or more hydrogen atoms of ethylene carbonate by halogens. Since the halogen substituted ethylene carbonate (for instance, fluorinated ethylene carbonate) is extremely low in its reactivity with a negative electrode, a loss capacity is small so that it is very effective for obtaining a high capacity. Further, the halogen substituted ethylene carbonate has a melting point lower than that of ethylene carbonate, it can realize a large capacity with less deterioration of a low temperature performance than that of ethylene carbonate. Accordingly, a strength, a liquid retaining characteristic, a stability relative to the negative electrode, a battery capacity, a cyclic characteristic a load characteristic and a low temperature characteristic can be improved. <IMAGE> |
