| abstract |
An object of the present invention is to provide a secondary battery that has excellent electrolyte solution retention and ion conductivity, has high mechanical strength and shape retention, does not require an extra step for crosslinking, and has excellent cycle characteristics. And a vinyl acetal polymer used in the polymer electrolyte gel composition. A vinyl acetal polymer for a polymer electrolyte gel composition comprising a vinyl acetal polymer containing a cationic functional group, and the vinyl acetal polymer and an electrolyte solution, A polymer electrolyte gel composition having a weight ratio of a vinyl acetal polymer to the electrolytic solution of 0.5: 99.5 to 9:91. [Selection figure] None |