| 摘要 |
PURPOSE:To suppress the drop in the performance of a battery, by using a high-molecular polymer having a soluble portion and an insoluble portion as to a nonaqueous solvent, as a gelation-causing agent, to improve the ion conductivity and chemical stability of the battery. CONSTITUTION:A high-molecular polymer, which is used as a gelation-causing agent, is generally a copolymer of a monomer whose homopolymer is soluble to a nonaqueous solvent and another monomer whose homopolymer is insoluble thereto. For example, the copolymer is composed of a monomer represented by a formula I and another monomer represented by a formula II, when a high-boiling-point solvent such as propylene carbonate and gamma-type butylolactone is used as the nonaqueous solvent for the electrolyte of a lithium battery. The structural portion of the copolymer, which results from the monomer represented by the formula I, is soluble to the high-boiling-point solvent, while the structural portion of the copolymer, which results from the monomer represented by the formula II, is insoluble thereto. |
