Electrochromic material as well as preparation method and application thereof

Abstract

The invention relates to an electrochromic material as well as a preparation method and application thereof. The electrochromic material is formed by polymerizing viologen compounds containing unsaturated double bonds and ionic liquid containing unsaturated double bonds. The novel viologen functionalized polyion liquid provided by the invention can be directly used as an electrochromic material, does not need to support electrolyte, and has the characteristics of high capacitance, low melting point, excellent thermal stability and electrochemical stability, negligible volatility and incombustibility, good designability, wide electrochemical window and the like; and meanwhile, the dual functions of supporting the polymer and a conductive substrate are achieved. The electrochromic device prepared from the material is high in cycling stability, obvious in color change, short in response time, low in driving voltage, low in cost and simple in preparation process, and meanwhile, the problems of viologen micromolecule dimerization and electrolyte leakage are solved.

Description

technical field [0001] The invention relates to the technical field of photoelectric materials, in particular to an electrochromic material and its preparation method and application. Background technique [0002] Electrochromism refers to the electrochemical reaction of materials that can reversibly change their optical properties (reflectivity, transmittance, and absorbance), accompanied by reversible changes in color. Compared with thermochromism, photochromism and liquid crystal switchable glass, the modulation of optical properties by electrochromism is based on its redox reaction. In addition, electrochromic devices have the characteristics of user-controllable color change, low power consumption, low operating voltage, continuously adjustable optical properties, green environmental protection and intelligence. Therefore, such materials have been widely used in electrochromic smart windows, automotive automatic anti-glare rearview mirrors, color-changing sunglasses, m...

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Problems solved by technology

[0007] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide an electrochromic material, especially to provide a viologen functionalized polyionic liquid, which overcomes the complex preparation process, single color type, and short response time of the prior art. Long life, poor cycle stability, dimerization of small viologen molecules, and insufficient leakage of solution-type electrochromic devices. The viologen-functionalized polyionic liquid can be directly used as an electrochromic material, and has high capacitance, low Excellent melting point, excellent thermal and electrochemical stability, negligible volatility and non-flammability, good designability and wide electrochemical window, taking into account the dual functions of supporting polymer and conductive matrix

The electrochromic device prepared by using it has obvious color change, short response time, low driving voltage, and low cost. At the same time, it solves the problems of viologen small molecule dimerization and electrolyte leakage, and has a good application prospect.

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