Preparation of all-solid-state super capacitor based on hydrogel electrolyte

Abstract

The invention provides an all-solid-state capacitor based on a hydrogel electrolyte and an assembling method thereof in view of the defects of a super capacitor based on a liquid electrolyte. The assembling method comprises the following steps: soybean protein-polyacrylamide composite hydrogel is formed by taking a mixed solution of soybean protein and acrylamide as a prepolymer, adding an initiator ammonium persulfate, a cross-linking agent N, N'-methylene bisacrylamide and calcium chloride and carrying out heating and cross-linking; the composite hydrogel is immersed into an ionic solution at room temperature for replacement to obtain a hydrogel electrolyte in which ions are dissolved; and on the basis, carbon nanotube electrodes are directly adhered to the two sides of the hydrogel electrolyte to obtain an all-solid-state capacitor with a sandwich structure, wherein any adhesive, diaphragm or substrate is not needed. The prepared hydrogel electrolyte has the characteristics of simple preparation method, biocompatibility, environmental friendliness and the like. The assembled all-solid-state super capacitor has the advantages of simple assembly process, excellent electrochemicalperformance, high safety and the like. The invention discloses a preparation method of the all-solid-state capacitor.

Description

technical field [0001] The invention relates to the preparation of a soybean protein composite hydrogel electrolyte and its application in a supercapacitor. Background technique [0002] Supercapacitors, also known as electrochemical supercapacitors, are electrical energy storage devices between traditional capacitors and batteries. Compared with traditional capacitors, they have higher output power; compared with batteries, they have higher Energy Density. Therefore, it combines the advantages of traditional capacitors and storage batteries, which is conducive to expanding its application in high-power and high-energy power supplies. In addition, supercapacitors also have the advantages of short rate time, wide operating range, short charging time, and long cycle life. In recent years, with the rapid development of flexible electronic devices, supercapacitors, as one of the main energy supply devices for electronic products, how to adapt to the requirements of flexible el...

AI Technical Summary

Problems solved by technology

At this stage, hydrogels are mainly prepared from petroleum-based raw materials, which have disadvantages such as high cost, poor biocompatibility, and non-renewability.