Electrochromic composition, multilayer structure, and electrochromic device

By optimizing the formulation and multilayer structure design of the electrochromic composition, the problem of unstable transfer of electrochromic materials on the transparent conductive layer was solved, achieving the stability and appropriate thickness of the electrochromic film, and improving the electrochromic effect and the aesthetic value of the device.

CN122345952APending Publication Date: 2026-07-07IND TECH RES INST

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
IND TECH RES INST
Filing Date
2025-03-07
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing electrochromic materials, when the composition ratio is not right, are prone to insufficient or excessive cross-linking, which affects the stability and adhesion of the film, making it difficult to transfer smoothly onto the transparent conductive layer, and the unsuitable thickness affects the effect and device size.

Method used

By optimizing the ratio of polyimide, crosslinking agent, electrochromic material and solvent, and combining it with a multilayer structure design, including the precise coating and attachment process of release film and transparent conductive layer, a stable electrochromic film is formed.

Benefits of technology

This method achieves smooth transfer and stability of the electrochromic film on the transparent conductive layer, ensuring the continuity and appropriate thickness of the film, and enhancing the electrochromic effect and the aesthetic value of the device.

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Abstract

The electrochromic composition includes 100 parts by weight of a polyimide; 0.0001 to 0.01 parts by weight of a crosslinking agent; 5 to 50 parts by weight of an electrochromic material; and 150 to 350 parts by weight of a solvent. The polyimide is formed from a dianhydride monomer and a diamine monomer. The dianhydride monomer is selected from at least two of a group consisting of a plurality of dianhydride monomers. The diamine monomer is a combination with other diamines, and 6FAP accounts for 15 mole % to 55 mole % of the diamine monomers.
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