The application of graphene in supercapacitors can significantly improve the energy density. Due to the limitation of electrode materials, the energy density of existing supercapacitors is mostly lower than 50Wh/kg. The specific surface area of graphene is 2630m2/g, and its application to the electrode material of supercapacitors can significantly improve the energy density of supercapacitors. At present, laboratory results have achieved energy storage density of 170Wh/kg, which greatly exceeds the energy density of existing supercapacitors. However, in the capacitor assembly process, due to the existence of graphene agglomeration phenomenon, the energy density of the corresponding supercapacitor is limited, and the current research direction is mainly to change the type of electrolyte, the graphene morphology and the graphene-based composite electrode material.

At present, graphene capacitors are still in the research and development stage, but in terms of existing technological development, the technical difficulty of supercapacitors is not very high, the manufacturing cost is relatively low, and the future industrialization prospect is promising.

Applications of graphene in other fields

Because of its excellent electrochemical properties, graphene is also used in other fields in addition to lithium-ion batteries and supercapacitors.

For example, the use of graphene's ultra-high electron migration characteristics to prepare solar cell materials to greatly improve the efficiency of solar energy conversion; Make use of the strong and excellent flexible properties of graphene to prepare flexible materials for flexible displays, wearable devices, etc. The low toxicity of graphene to organisms and the high carrier transport ability of graphene are used to prepare drug carriers, which makes graphene have broad application prospects in biomedicine and biological diagnosis. With the excellent physical and chemical stability of graphene, graphene-based heavy anticorrosive coatings have entered the industrial demonstration application stage; Because of its high thermal conductivity and special pore structure, graphene is also used in the preparation of high-efficiency thermoelectric materials and seawater desalination.

It can be predicted that graphene will have extremely important application value in various fields in the future, with broad development prospects and huge market potential.