An electrochromic/energy storage dual-function device and its application

Abstract

The invention discloses an electrochromic / energy storage dual-function device and an application thereof. The device is made of metal zinc as the negative electrode, and the Prussian blue electrochromic film attached to the conductive substrate is used as the positive electrode; 2+ and K + The dual-ion electrolyte fills the gap between the positive and negative electrodes. The electrochromic / energy storage dual-function device not only has an electrochromic function, but also has an electric energy storage capacity similar to that of a battery. Compared with known solutions, the device disclosed in the present invention has the advantages of large output voltage, high energy density, fast discoloration speed, large discoloration range, long cycle life, cheap raw materials, simple preparation process, non-toxic and pollution-free, and the like.

Description

technical field [0001] The invention belongs to the field of functional materials and devices, in particular to an electrochromic / energy storage dual-function device and its application. Background technique [0002] Traditional electrochromic glass generally consists of transparent conductive glass, ion storage layer, ion conductor layer (electrolyte layer), electrochromic layer, and transparent conductive glass. Among them, the transparent conductive glass is connected to the external circuit to play a conductive role; the electrochromic layer can realize the reversible color changing process by reacting with the color-changing active ions; the ion conductor layer and the ion storage layer are used to transmit and store the electrochromic layer The color-changing active ions required for the reaction. As a typical electrochemical device, electrochromic glass has a very similar device structure and reaction mechanism to batteries and supercapacitors. Therefore, in recent ...

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Problems solved by technology

However, due to the dense aluminum oxide passivation layer on the surface of metal aluminum, a large polarization voltage (about 0.6 V, the difference between charge and discharge voltage) appears when the device is charging and discharging, which is not conducive to the high power of the device. use

More importantly, the electrochemical dissolution-deposition reaction of the aluminum negative electrode in the aqueous electrolyte used is irreversible. After a long cycle, the aluminum foil is completely consumed, and the device appears after about 50 charge-discharge / coloring-fading cycles. Significant performance attenuation severely limits the performance improvement of this type of device

Using aluminum ions as the intercalated ions in the color-changing layer of the positive electrode can improve the structural stability of the positive electrode, but this electrolyte is very acidic and will severely corrode the zinc negative electrode, and the cycle life of the device is still less than 200 times (Joule 2019, 3, 2268.)

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