Flexible variable emissivity electrochromic device and preparation method

A preparation method of a flexible variable emissivity infrared electrochromic device, comprising the following steps:

• S1:
• surface-modifying a flexible polymer film and/or plating a transition layer on one side of the flexible polymer film to obtain a surface-modified flexible polymer film or the flexible polymer film with the transition layer or the surface-modified flexible polymer film with the transition layer;
• S2:
• depositing a metal film on one side of the surface-modified flexible polymer film, to obtain a working electrode;
• or
• depositing the metal film on a transition layer side of the flexible polymer film or the transition layer side of the surface-modified flexible polymer film, to obtain the working electrode;
• S3:
• preparing a gel electrolyte, and infiltrating a porous membrane with the gel electrolyte to obtain a gel electrolyte layer, the electrolyte layer comprises the porous membrane and the electrolyte, the electrolyte comprises an electrochromic material containing metal ions and a solvent, the metal ions enable a reversible electrodeposition and a dissolution, and a metal of the metal ions is different from a metal used in the metal film and wherein the metal ions are one or more selected from the group consisting of:
• Ag, Bi, Cu, Sn, Cd, Hg, In, Pb, Sb, Al, and Zn;
• S4:
• directly depositing a conductive layer on one side of a substrate, to obtain a counter electrode;
• and
• S5:
• superimposing one side of the working electrode obtained in S2 deposited with the metal film on one side of the gel electrolyte layer obtained in S3, and superimposing one side of the counter electrode obtained in S4 deposited with the conductive layer on an other side of the gel electrolyte layer obtained in S3 to obtain a superimposed structure, and sealing edges of the superimposed structure to obtain the variable emissivity infrared electrochromic device based on a metal electrodeposition.