Elastic and stretchable electrochromic device

Abstract

The invention provides an elastic and stretchable electrochromic device. The device comprises at least two layers of elastic and transparent conductive film and at least one layer of elastic electrochromic film. The device is characterized that an all-solid-state and high-transparency elastic electrochromic film is formed by taking a high-molecular polymer as a carrier, and passing through a castfilm device under high temperature; an elastic and transparent conductive film is prepared on the surface of a release film by taking an acrylamide high-molecular polymer as a carrier and using a screen printing technology; and sequentially packaging a multilayer material by using a vacuum automatic laminator to obtain an elastic and stretchable electrochromic device; the color change efficiency is 5-15 seconds, the fading efficiency is 3-10 seconds, the transmittance is increased to 95%, the coloring efficiency reaches to 150cm2 / C, and the stretching deformation reaches to 400%. Flexible andstretchable electrochromic fibers are designed and producted, thereby solving the problem of elastic stretchable display and the key problem existing in the preparation of stretchable devices, the field of market application is greatly improved, and the elastic and transparent conductive film has a good application prospect in the fields of flexible batteries, energy storage, intelligent wearing,flexible display and the like.

Description

technical field [0001] The invention belongs to the field of new chemical material preparation, and in particular relates to an elastically stretchable electrochromic device. 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 and th...

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 CN 105573001 A discloses a flexible electrochromic film, including a flexible transparent substrate, a first layer of nanowire film co-assembled by silver nanowires and tungsten oxide nanowires, and silver nanowires and tungsten oxide nanowires. The second layer of nanowire film assembled with wires uses silver nanowires with good conductivity, so that the co-assembled nanowire film has good conductivity, so that the co-assembled nanowire film can be used as a conductive substrate, which overcomes the traditional Electrochromic devices require brittle ITO as a limitation of conductive substrates; however, stretchable electrochromic devices cannot be realized due to the limitation of nanowire conductivity, which limits the application range of products

Chinese patent application document CN 107167980 A discloses a method for preparing a flexible electrochromic film, a solid electrolyte film prepared with PVB as a carrier, an inorganic lithium compound is dissolved in a polycarbonate solution as an electrolyte ion solution, and a certain Proportionally add additives and dissolve them with an organic solvent, then form a uniform slurry by ball milling, and then form a transparent and uniform electrolyte layer on the surface of the transparent conductive layer by screen printing or spraying, and prepare a high-efficiency electrolyte layer after vacuum sealing. A solid-state electrochromic device, the electrochromic device prepared by this method has high conversion efficiency, stable performance, and is easy to produce in a large area, but it cannot achieve the performance of an elastic device

Images