Rejuvenation reagents-Australian scientists use graphene to make supercapacitors

Australian scientists have made a denser supercapacitor using graphene. Its service life is comparable to traditional batteries, and its energy density is 12 times that of existing supercapacitors. It can be widely used in renewable energy storage and portable electronic devices. And electric vehicles and other fields. Related research was published in the latest issue of Science.

Supercapacitors are generally composed of porous carbon, which is filled with a liquid electrolyte (its main role is to transfer charge). The biggest advantage of super capacitors is long service life and fast charging, but its shortcomings are also obvious, that is, the energy density is relatively low. The energy density of current super capacitors is only 5-8 hours watts / liter, which means that super capacitors It is very large or must be charged frequently.

Now, a research team led by Li Dan, a professor of materials engineering at Monash University, has developed a supercapacitor with an energy density of 60 hours watts per liter, which can be about 12 times the energy density of current supercapacitors. The Li Dan team turned their attention to the rising star graphene in the material industry. Because the chemical properties of graphene are very stable, and the conductivity is excellent.

The Li Dan team used an adaptable graphene gel film that they had previously developed to make dense electrodes in new supercapacitors. In addition, they use a liquid electrolyte, a conductor in traditional supercapacitors, to control the spacing between graphene sheets at the sub-nanoscale. This liquid electrolyte serves two purposes: maintaining the small spacing between graphene sheets and conducting electricity.

Unlike the traditional "hard" porous carbon, many unnecessary large "pores" waste a lot of space. The Li Dan team used electrodes made of graphene sheets to maximize the energy density without compromising porosity . The method they use is similar to the method used in the traditional papermaking process, which means that this method is easy to upgrade industrially and also has a cost advantage.

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