An objective of the present invention is to provide a gel polymer electrolyte composition which exhibits excellent electrolyte retaining ability, excellent ion conductivity, higher mechanical strength and excellent shape preservation, which does not require an extra step for crosslinking, and which can provide a secondary battery with excellent cycle properties and a vinyl acetal polymer used for a gel polymer electrolyte composition. There are provided a vinyl acetal polymer for a gel polymer electrolyte composition, wherein the vinyl acetal polymer has a cationic functional group, as well as a gel polymer electrolyte composition comprising the vinyl acetal polymer and an electrolyte solution, wherein a weight ratio of the vinyl acetal polymer to the electrolyte solution is 0.5:99.5 to 9:91.
本发明的目的是提供一种凝胶聚合物电解质组合物,该组合物具有优异的电解质保持能力、优异的离子传导性、较高的机械强度和优异的形状保持性,不需要额外的交联步骤,可提供具有优异循环性能的二次电池,以及一种用于凝胶聚合物电解质组合物的
乙缩醛聚合物。提供了一种用于凝胶聚合物电解质组合物的
乙烯基乙缩醛聚合物,其中
乙烯基乙缩醛聚合物具有阳离子官能团,以及一种凝胶聚合物电解质组合物,该组合物由
乙烯基乙缩醛聚合物和电解质溶液组成,其中
乙烯基乙缩醛聚合物与电解质溶液的重量比为 0.5:99.5 至 9:91。