Flexible electrochromism thin film preparation method

Abstract

The invention provides a flexible electrochromism thin film preparation method. The flexible electrochromism thin film device includes at least two flexible transparent conductive layers, at least one electrochromism layer, and at least one high efficient solid electrolyte membrane; the solid electrolyte membrane is prepared from a PVB carrier, an inorganic lithium compound is dissolved in a polycarbonate solution as an electrolyte ion solution, an additive is added into the electrolyte ion solution according to a certain proportion, an organic solvent is used to dissolve the additive, an even sizing agent is formed through ball-milling, transparent even electrolyte layers are formed on surfaces of the transparent conductive layers through a silk-screen printing technology or a spraying method, a high efficient solid electrochromism device is acquired after vacuum seal, the adjustment voltage is 5-15 V under the action of a direct-current power supply, the high efficient solid electrochromism device changes from an achromatic color to a dark color, and the color changing efficiency is 5-30 seconds; and then a positive electrode and a negative electrode of the power supply are adjusted, the adjustment voltage is 5-10 V, and the high efficient solid electrochromism device becomes colorless again.

Description

technical field [0001] The invention belongs to the field of preparation of new chemical materials, and in particular relates to the preparation of a flexible electrochromic film. Background technique [0002] Electrochromism (Electrochromism) refers to the phenomenon that under the action of electric field and current, materials cause redox reactions through electrochemical processes to produce reversible discoloration. The electrochromic system has a complex structure, usually consisting of five layers of electrochromic layer (EC), ion conductive layer (IC) and ion storage layer (IS) sandwiched between two transparent conductive layers (TC). When a DC voltage of 1-3V is applied between the conductive layers, the conductive ions will shuttle back and forth between the ion storage layer and the electrochromic layer. Utilizing the electrochromic properties of the material, it can be made into a smart window (smart window, also known as a smart window) with adjustable color a...

AI Technical Summary

Problems solved by technology

Although the use of interlayer films in laminated glass can solve the problem of energy saving in buildings, these laminated electrochromic glasses mainly use liquid electrolytes as the ion transport layer of electrochromic glasses, which will bring new problems to the packaging of electrochromic glasses. Great inconvenience, but also not conducive to large-area display

A similar Chinese patent application document CN106020350 A discloses a method for preparing a gel electrolyte. This method prepares an electrolyte layer with high efficiency, but it cannot be industrialized because it exists in a liquid state.

Chinese patent application documents CN106117932 A and CN103214983 B disclose a kind of PVB as carrier, adopt the mode of twin-screw melt blending extrusion to prepare PVB conductive masterbatch, then add PVB conductive masterbatch in proportion in the process of extrusion casting Granules, a high-conductivity PVB film is made, and finally the air and moisture are completely exhausted by autoclave to make electrochromic laminated glass. The electrochromic glass prepared by this method has high conversion efficiency and stable performance, but the large There are limitations in area preparation, and the cost of industrial production is high and the process is complicated

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