Electrochromic device with asymmetric electrode structure, preparation method thereof and application thereof

Abstract

The invention belongs to the technical field of electrochromic devices. The invention discloses an electrochromic device with an asymmetric electrode structure, a preparation method thereof and application thereof. The preparation method comprises the following steps of taking acrylamide as a monomer, N, N-dimethyl bisacrylamide as a cross-linking agent, ammonium persulfate as a thermal initiator,tetramethylethylenediamine as a catalyst and sodium chloride as an electrolyte to prepare ionic conductive polyacrylamide hydrogel as an ionic conductive layer; depositing a uniform cathodic discoloration film on a transparent ITO electrode to serve as an electrochromic functional layer, and uniformly placing the conductive hydrogel on the electrochromic functional layer; and placing an electrochemical substance which is easy to oxidize or metal ions which are easy to oxidize on an edge of the conductive layer, and performing packaging with a preservative film to obtain the electrochromic device based on the asymmetric electrode structure. According to the invention, the device with excellent properties is prepared. The device is simple in structure, a complex packaging process is omitted, and the electrochromic property is excellent.

Description

technical field [0001] The invention belongs to the technical field of electrochromic devices, and in particular relates to an electrochromic device with an asymmetric electrode structure, a preparation method and an application. Background technique [0002] At present, the existing electrochromic smart windows, such as the smart dimming windows on commercial Boeing aircraft, are generally made of inorganic metal oxide materials, which have the disadvantages of uneven and slow color change, and the preparation and packaging of the device are relatively complicated. , This is due to the limitation of the material itself; the anti-glare rearview mirror of the car is generally prepared and packaged by liquid organic electrochromic materials, which will have some safety problems, such as easy leakage. At present, the closest existing technology: With the improvement of technology and the development of society, the field of intelligent color changing is an emerging field due to...

AI Technical Summary

Problems solved by technology

[0003] So far, some electrochromic products have been developed and put into use, including anti-glare rearview mirrors for some cars, intelligent color-changing windows for aircraft, etc., but there are still some problems that restrict the development of electrochromic devices. develop

At present, the mature application of electrochromic materials is rarely used, mainly tungsten trioxide, the color of the material is difficult to achieve multi-color, and the method of magnetron sputtering requires large-scale equipment, high cost, high preparation requirements, and due to the material itself The limitation of properties leads to slow response speed of the device; another material, violin-like small molecule electrochromic material, is a highly toxic and harmful material, and it is difficult to prepare a solid film, which is generally used in the form of a liquid device) with a single color, The preparation process of the device is complicated, the response speed is slow, the reversibility is not good, and the device is mostly liquid, etc.

Compared with liquid devices, solid-state devices are safer and have better discoloration properties. However, due to the complex structure and packaging problems of solid-state devices, solid-state devices are usually composed of electrochromic layers, ion-conducting layers, and ion storage layers. Each layer needs to be constructed Forming a thin film and then assembling together, the current bonding and packaging process is not mature enough; this greatly affects its industrialization process and limits its development in practical applications

[0004] To sum up, the problems existing in the existing technology are: the current electrochromic products have a single color, the preparation process of the device is complicated, the response speed is slow, the reversibility is not good, and the device is mostly liquid; the complex structure and packaging of the solid-state device

[0005] The difficulty of solving the above technical problems: 1. For a single color, it is generally necessary to design new materials or modify existing materials to change the spectral absorption changes of substances in redox, which requires long-term exploration and optimization; 2. For devices For the problem of complex process, it is necessary to improve the traditional device structure, so that the components of the device can be organically unified, and a new design is required; 3. For the problem of slow response speed and poor reversibility, it is necessary to choose a suitable color-changing material to match a suitable device Structure or design and synthesis of new high-performance materials; 4. The current devices are mostly liquid and prone to safety problems, so it is necessary to design new device structures and prepare solid-phase electrochromic materials to prepare devices; 5. For solid-state devices with complex structures, There are packaging problems, and it is necessary to design an efficient and simple device preparation method, using suitable materials

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