Super capacitor with electrochromic function and high energy density and preparation method thereof

Abstract

The invention relates to a supercapacitor with an electrochromic function and high energy density and a preparation method thereof. The supercapacitor comprises a negative current collector, a negative energy storage electrode layer, an electrolyte, a positive energy storage electrode layer and a positive current collector from top to bottom in sequence, wherein the negative current collector comprises a transparent substrate, an electrochromic layer and a conductive metal layer from top to bottom; the transparent substrate allows partial or all visible light to penetrate through; the electrochromic layer can realize different color changes under electrochemical stimulation; the conductive metal layer can reflect part or all of visible light and has a porous structure penetrating through the upper and lower surfaces, and ions in the electrolyte can penetrate through the porous structure of the conductive metal layer to be in contact with the electrochromic layer in the charging and discharging process of the supercapacitor, so that the negative current collector has an electrochromic function. The negative electrode current collector is reflective electrochromic, and the problem that in the prior art, a supercapacitor cannot have the high energy density and the electrochromic function at the same time is solved.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a supercapacitor with electrochromic function and high energy density and a preparation method thereof. The supercapacitor realizes energy visualization through reflective electrochromism. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device with higher power density than traditional batteries and higher energy density than traditional capacitors. It provides electronic products with a power supply method that balances power and energy. The electrochromic function is integrated in the supercapacitor, and the remaining energy state can be judged by observing the color change of the appearance of the supercapacitor with human eyes. This energy visualization function is convenient for people to monitor and manage the energy of the supercapacitor at any time. The electrochromic process does not require additional sign...

AI Technical Summary

Problems solved by technology

However, the conductivity of conductive glass is 1–3 orders of magnitude lower than that of traditional current collectors represented by metal foil or carbon thin film materials, which aggravates the resistance of electron transport in electrode materials and further limits the electrochemical performance of supercapacitors.

Although the use of non-transparent current collectors has higher conductivity, which can generally promote the energy storage performance of supercapacitors, but the existing technology has not yet realized the integration of non-transparent current collectors and the electrochromic function of supercapacitors.

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