As a kind of energy storage device, supercapacitor has the characteristics of high power density, fast charge and discharge, long life and safety. However, the lower energy density of supercapacitors compared to batteries limits their commercial application. With a large number of studies, the electrode materials of supercapacitors continue to emerge breakthrough progress, and new supercapacitors have caused extensive research, such as repairable supercapacitors, stretchable supercapacitors, wearable supercapacitors, hybrid supercapacitors and so on.

One is a stretchable and healing supercapacitor based on a double crosslinked hydrogel electrolyte. Second, MoS2/ nitrogen-doped carbon composite material is used as a supercapacitor electrode with ultra-high pseudocapacitance. The third is a creased vertical CNT array used as a highly stretchable supercapacitor electrode. The fourth is to increase the capacitance of the graphene double layer by ball milling. Fifth, the use of heteroatom doping and pore engineering to improve the electrochemical performance of the superelectric carbon material electrode.

For carbon materials, the methods to improve the capacitance value include adjusting the pore structure and specific surface area, doping of heteroatoms, increasing moisture and so on. For pseudocapacitor materials, the methods to improve their capacitance value include combining them with carbon materials with high conductivity or changing their own characteristics. In short, how to improve the energy density while maintaining a high power density is still a hot spot in the research of supercapacitor electrode materials.