Composite gel electrolyte of zinc ion battery as well as preparation method and application of composite gel electrolyte

The invention discloses a composite gel electrolyte of a zinc ion battery, a preparation method and application thereof, and the preparation method comprises the following steps: respectively dissolving potassium ferricyanide and sulfate containing metal ions in water to form a solution a and a solution b, slowly dropwise adding the solution b into the solution a, stirring, reacting for a certain time, filtering, cleaning and drying to obtain the composite gel electrolyte of the zinc ion battery. The ferricyanide is obtained; the preparation method comprises the following steps: dissolving zinc trifluoromethanesulfonate in water to form a solution, filtering to obtain a zinc trifluoromethanesulfonate solution, dispersing ferricyanide in the zinc trifluoromethanesulfonate solution, and performing ultrasonic treatment to obtain a solution A; dissolving polyvinyl alcohol in the solution A, heating and stirring, standing, freezing and unfreezing to obtain the composite gel electrolyte. According to the invention,