| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymer secondary battery capable of heightening mechanical strength of a separator, and enhancing a charge and discharge cycle life. SOLUTION: This polymer lithium secondary battery is equipped with a positive electrode 1, a negative electrode 2 and a separator 3 electrically isolating the positive electrode 1 and the negative electrode 2 and containing a copolymer of vinylidenefluoride(VdF) and hexafluoropropylene(HFP), and as for the separator 3, the HFP copolymerization rate of the copolymer existing on its surface being in contact with the positive electrode 1 and the negative electrode 2 is made higher in comparison with the copolymer existing inside. |
