AA Carbon battery.Current research status of graphene in the field of supercapacitors

　　Graphene is the thinnest, lightest, hardest, most conductive and highly flexible nanomaterial in the world. Its power is often staggering. A one centimeter thick graphene plate can allow a 5-ton adult elephant to stand firmly on it; a mobile phone battery made of graphene can be fully charged in one second; a tablet computer made of graphene , can be folded into the size of a mobile phone and placed in your pocket.

　　Since the birth of graphene, people have been very interested in the research and development and application prospects of this new material, making it the darling of capital and market pursuits. It is also widely used in the fields of electronics, aerospace specialties, new energy and new materials, etc.

　　Qian Weizhong, a professor at the Department of Chemical Engineering at Tsinghua University, and Shi Jidong, a doctoral candidate at the National Center for Nanoscience, participated in the release event as specially invited experts and conducted exchanges and discussions with the participants based on their current research work.

　　Graphene supercapacitor technology: China in a period of rapid growth

　　Today's energy and environmental problems are becoming increasingly serious, and there is an increasing demand for the development of green transportation represented by new energy electric vehicles. Solving the problem of its braking energy recovery system is one of the keys to industrial development. Therefore, the industry has an increasingly urgent need for electrochemical energy storage devices that take into account high energy density and high power density. At the same time, supercapacitors have great expectations due to their advantages such as long service life, short charging time, display of stored energy, unlimited materials, and good low-temperature performance.

　　Graphene has good electrochemical properties, tensile resistance and a structure that is easy to synthesize with other active materials. Similar to activated carbon, it can be used as a good and stable negative electrode material and is gradually being applied to supercapacitor capacitor materials. The main research areas of graphene supercapacitors include: transition metal oxides for electrode materials, activated coal, nitrogen-doped graphene, current collector surface, etc.; involved technologies include graphene oxide monomer, transition metal oxides, nitrogen Doping, coal activation, etc.

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