The invention belongs to the field of
high polymer materials and
new energy materials, and discloses a jet
plasma assisted method for preparing a
sodium ion composite polymer solid electrolyte, which comprises the following steps: treating mixed
powder of a
polymer, a
sodium salt and an active filler according to a certain proportion by using
atmospheric pressure jet
plasma, rapidly melting the mixed
powder at a high temperature generated by the jet
plasma, and uniformly stirring the melted mixture to obtain a precursor; and carrying out
hot pressing on the precursor at a certain temperature, for a certain time and under a certain pressure to form a film, and cooling to
room temperature to obtain the
composite polymer solid electrolyte film. According to the method, the
raw material mixing time is shortened, the preparation process flow of the
solid electrolyte is greatly simplified, and the method has the advantages of short production period, low production cost, environmental friendliness and the like; meanwhile, active free radicals in the
polymer are effectively increased,
sodium dendrite growth is inhibited, and a negative
electrode interface is stabilized, so that the
cycling stability of the solid electrolyte is improved, and the solid electrolyte is suitable for large-scale production.