Search

CN-122018208-A - Copper-silver-zinc ternary synergistic electrochromic material, device and preparation method thereof

CN122018208ACN 122018208 ACN122018208 ACN 122018208ACN-122018208-A

Abstract

The invention discloses a copper-silver-zinc ternary synergistic electrochromic material, a device and a preparation method thereof, and relates to the technical field of electrochemical devices; the material comprises metal salt, electrolyte components and a solvent system, wherein the metal salt comprises copper salt, silver salt and zinc salt, the material is prepared by stirring the solvent system and the electrolyte components, then adding the copper salt, the silver salt and the zinc salt, and continuing stirring to obtain the material, the material comprises a first transparent conductive substrate, an electrochromic material layer and a second transparent conductive substrate, the material is prepared by coating the material on the surface of the first transparent conductive substrate to form the electrochromic material layer, then attaching the second transparent conductive substrate to the first transparent conductive substrate, sealing the edges of the first transparent conductive substrate, and finally arranging a conductive tape or wire to obtain the electrochromic device.

Inventors

  • YANG GUOJIAN
  • TAN GANG
  • LIU ZHONGTAN
  • XU ZHONGZHEN

Assignees

  • 浙江大学长三角智慧绿洲创新中心

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The copper-silver-zinc ternary synergistic electrochromic material is characterized by comprising metal salt, an electrolyte component and a solvent system, wherein the molar ratio of the metal salt to the electrolyte component is 9:20-4:5, and the solvent system is used for fully dissolving the metal salt and the electrolyte component; The metal salt comprises copper salt, silver salt and zinc salt, wherein the copper salt is CuCl 2 , the silver salt is AgNO 3 , the zinc salt is ZnBr 2 or ZnCl 2 , and the molar ratio of the copper salt to the silver salt to the zinc salt is 3:1:0-20:1:7; The electrolyte component is selected from tetrabutylammonium bromide, butylammonium bromide, lithium salt and sodium salt, wherein the lithium salt is LiCl, liBr or LiTFSI, and the sodium salt is NaCl or NaBr; The solvent system is a polar organic solvent or a gel monomer, the polar organic solvent is formed by mixing one or more of N-methyl pyrrolidone, dimethyl sulfoxide, propylene carbonate, ethylene carbonate and N, N-dimethylformamide according to any proportion, and the gel monomer is polyethylene glycol diacrylate, polyethylene glycol dimethacrylate or methacrylic anhydride gelatin.
  2. 2. The electrochromic material according to claim 1, wherein when the solvent system is a polar organic solvent, the material is in a liquid state.
  3. 3. The electrochromic material of claim 1, wherein when the solvent system is a gel monomer, a photoinitiator is further added, wherein the molar ratio of the photoinitiator to the total molar amount of the metal ions is in the range of 1:200-1:2, and the material is in a gel state.
  4. 4. A method for preparing electrochromic material according to claim 1, which is characterized in that electrolyte components are added into a solvent system, stirred and dissolved until the electrolyte components are clarified, then metal salt is added, and stirring is continued to fully dissolve the electrolyte components, so that the ternary synergistic electrochromic material can be obtained.
  5. 5. An electrochromic device prepared from an electrochromic material according to claim 1, characterized by comprising a first transparent conductive substrate (1), an electrochromic material layer (2), a second transparent conductive substrate (3), wherein the electrochromic material layer (2) is arranged between the two transparent conductive substrates.
  6. 6. The device according to claim 5, characterized in that the first and second transparent conductive substrates (3) comprise a transparent substrate layer and a transparent conductive layer, the transparent substrate layer being glass, the transparent conductive layer being selected from ITO material, FTO material, AZO material.
  7. 7. The device according to claim 5, characterized in that the electrochromic material layer (2) has a thickness of 10-500 μm.
  8. 8. A method of making the device of claim 5, comprising the steps of: S1, cleaning an organic solvent, performing ultrasonic treatment and drying the first transparent conductive substrate (1) and the second transparent conductive substrate (3); S2, coating or injecting the prepared electrochromic material on the surface of the transparent conductive layer of the first transparent conductive substrate to form an electrochromic material layer (2), and controlling the thickness of the electrochromic material layer (2); S3, aligning and attaching one side of the second transparent conductive substrate (3) containing the transparent conductive layer with one side of the first transparent conductive substrate (1) containing the transparent conductive layer, so that the electrochromic material layer (2) is clamped between the two transparent conductive layers to form a sandwich structure, and sealing the edge of the device; and S4, finally, arranging a conductive adhesive tape or a conductive wire at the edges of the transparent conductive layers at the two sides of the device to lead out an external electrode, thus obtaining the electrochromic device.
  9. 9. The method of claim 8, wherein the sealing process in step S3 is followed by photo-curing under a 365nm UV lamp when the electrochromic material is in a gel state.
  10. 10. A method according to claim 8 or 9, wherein the sealing treatment material is selected from epoxy, uv curable glue.

Description

Copper-silver-zinc ternary synergistic electrochromic material, device and preparation method thereof Technical Field The invention relates to the technical field of electrochemical devices, in particular to a copper-silver-zinc ternary synergistic electrochromic material, a device and a preparation method thereof. Background Electrochromic technology refers to technology that optical performance parameters such as transmittance, reflectivity, absorptivity and the like of materials can be changed stably and reversibly under the excitation action of an externally applied electric field, and the technology is usually represented by the change of color, transparency or reflection appearance, and is widely applied to the fields of intelligent windows of buildings, backdrop of automobiles, anti-glare rearview mirrors and the like. The electrochromic system based on the metal electrodeposition principle realizes the switching between a transparent state and a high-reflection state through the reversible deposition and dissolution of metal ions on the surface of an electrode, and has the advantages of high optical contrast, high response speed, relatively simple device structure and the like, thus being an important development direction of the current electrochromic technology. The method has the core principle that metal ions in the solution are subjected to electrochemical reduction on the surface of an electrode under the drive of an external electric field to form a metal atomic layer and are deposited on a transparent electrode, and when reverse voltage is applied, the deposited metal layer can be oxidized and redissolved into metal ions, so that the device is restored to a transparent state, and the reversible conversion between the transparent state and the metal state is realized. The mechanism can realize the regulation and control of the color and the reflectivity by means of the deposition and the dissolution of metal without a complex multilayer inorganic film structure. However, the existing metal electrodeposition electrochromic systems mainly depend on single or binary metal systems such as silver or silver-copper, and although the systems can realize certain optical modulation, the problems of low nucleation density, rough deposition layer, higher driving voltage, limited cycle life, higher driving voltage, slow deposition rate under the condition of low voltage, discontinuous film formation, insufficient cycle stability and the like generally exist. In particular, in a large-area device, the ohmic pressure drop and the interface polarization effect of the electrolyte layer are more obvious, and the ideal shading and reflecting effects can be obtained by increasing the external voltage, so that the energy consumption is increased, the deposition morphology is deteriorated, the service life of the device is reduced, and the popularization of the metal electrodeposition electrochromic technology in low-power consumption and large-scale application is seriously restricted. Particularly, island growth, dendrite formation and other phenomena can lead to uneven reflective layers and poor optical consistency, and severely restrict the quality and reliability of the electrochromic mirror device. Based on the above, there is a need in the art for an electrochromic material system that can achieve fast, uniform metal deposition at lower drive voltages to achieve both low power consumption, high optical modulation capability and good stability. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a ternary synergistic electrochromic material, a ternary synergistic electrochromic device and a preparation method thereof. The technical scheme adopted by the invention is as follows: The invention provides a copper-silver-zinc ternary synergistic electrochromic material which comprises metal salt, an electrolyte component and a solvent system, wherein the molar ratio of the metal salt to the electrolyte component is 9:20-4:5, and the solvent system is used for fully dissolving the metal salt and the electrolyte component; further, the metal salt comprises copper salt, silver salt and zinc salt, wherein the copper salt is CuCl 2, the silver salt is AgNO 3, the zinc salt is ZnBr 2 or ZnCl 2, and the molar ratio of the copper salt to the silver salt to the zinc salt is 3:1:0-20:1:7. Further, the electrolyte component is selected from tetrabutylammonium bromide, butylammonium bromide, lithium salt and sodium salt, wherein the lithium salt is LiCl, liBr or LiTFSI, and the sodium salt is NaCl or NaBr. The solvent system is a polar organic solvent or a gel monomer, wherein the polar organic solvent is formed by mixing one or more of N-methyl pyrrolidone, dimethyl sulfoxide, propylene carbonate, ethylene carbonate and N, N-dimethylformamide according to any proportion, and the gel monomer is polyethylene glycol diacrylate, polyethylene glycol dimethacrylate or methacrylic anhydride gelat