Stretchable supercapacitor with stainless steel spring adopted as base

Abstract

The invention discloses a stretchable supercapacitor with a stainless steel spring adopted as a base. The stretchable supercapacitor includes a stainless steel spring, an inner-layer electrode, an outer-layer electrode, and a gel electrolyte, wherein the stainless steel spring is adopted as the base of the stretchable supercapacitor, the inner-layer electrode and the outer-layer electrode are formed on the surface of the spring through in-situ growth or coat the surface of the spring, and the gel electrolyte is located between the two electrodes; the whole device is encapsulated with a flexible polymer material, so that the leak of the electrolyte can be prevented; the stainless steel spring, on the one hand, is adopted as a current collector of the inner-layer electrode, and on the otherhand, provides excellent stretchability for the device; the inner-layer electrode is made of a material such as a carbon material, a metal oxide and conductive polymer; the electrolyte is made of a polymer / electrolyte gel system such as PVA / H2SO4 and PVA / H3PO4; and carbon nanotubes or MXenes are wound so as to form the outer-layer electrode. The supercapacitor of the present invention can work normally under large tensile strain; the expected tensile strain of the supercapacitor can be as high as 100% under premise that the performance of the supercapacitor is not affected; and the outer spaceof the spring structural component can be efficiently utilized. The supercapacitor can be applied to systems such as high-speed train wireless monitoring systems.

Description

technical field [0001] The invention relates to a supercapacitor, especially a supercapacitor capable of working normally under relatively large tensile stress. Background technique [0002] As an emerging energy storage device, supercapacitors have the characteristics of high power density, fast charge and discharge rate, and long cycle life, and have attracted widespread attention in recent years. In some fields, it can be used as a supplement or even replace the battery. With the development of wearable devices and flexible display devices, flexible energy supply devices have attracted extensive research interest of researchers. Traditional flexible batteries / capacitors can only maintain stable performance under simple bending and twisting conditions, but often fail under large tensile and compressive strains. Therefore, it is of great significance to develop supercapacitors that can work normally under large tensile / compressive strains. [0003] For a stretchable supe...

AI Technical Summary

Problems solved by technology

At present, the stretchable supercapacitors developed by some researchers mostly use rubber or polyurethane as the stretchable substrate. Due to the limitation of the characteristics of polymer materials, these substrates will undergo high elastic-glass transition at lower temperatures, thus losing their stretchability. Stretchability

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