Method of producing a cross-linked polyvinyl alcohol separator for an alkali-zinc secondary battery

摘要

A method for producing a cross-linked polyvinyl alcohol separator having a film of cross-linked polyvinyl alcohol for an alkali-zinc secondary battery, and a cross-linked polyvinyl alcohol separator produced by the method are disclosed. The method includes the steps of: (1) providing a film of polyvinyl alcohol having degree of saponification of 70 to 98.5% and containing 1,2-diol units; (2) contacting the film of polyvinyl alcohol with an oxidizing agent to effect oxidative cleavage of the 1,2-diol units; (3) contacting the film of polyvinyl alcohol with an acid catalyst to catalyze acetalization to form a film of cross-linked polyvinyl alcohol; and (4) preparing a separator with the film of cross-linked polyvinyl alcohol.