Application of Graphene in Supercapacitors
The promotion of new energy vehicles and other industries has presented a very urgent demand situation for supercapacitors. The technology is stepping up research and development to better conduct large-scale commercial applications. At present, the excellent electrode performance of graphene is being paid more and more attention by R&D personnel, both of which will realize technological integration and common development.
Supercapacitors, also known as electrochemical capacitors, are based on double-layer capacitances generated at the high surface area carbon electrode/electrolyte interface, or based on the redox reactions that occur on the surface and bulk phases of transition metal oxides or conductive polymers. Energy storage. Its configuration is similar to that of a battery and mainly includes a positive electrode, an electrolyte, a separator, and a current collector.
As a new type of energy storage device, the supercapacitor has the advantages of high output power, short charging time, long service life, wide operating temperature range, safety and no pollution, and is expected to become a new type of green power supply in this century. The traditional supercapacitors are large in size and cannot adapt to the small size requirements of the microdevices for the energy storage devices. Therefore, the design and preparation of high-performance micro-supercapacitors and the application of energy storage units in micro-systems are currently one of the hot topics.
Graphene in super capacitor development application
As we all know, the electrode material is the key to the supercapacitor, which determines the main performance indicators of the capacitor, such as energy density, power density and cycle stability.
Graphene composed of a layer of carbon atoms arranged in a honeycomb pattern has been proven to be a new and highly efficient supercapacitor electrode material. Recently, the research team of Professor Richard Cannell of the School of Engineering and Applied Science at the University of California, Los Angeles developed a novel miniature supercapacitor based on graphene.
It is very exciting that the capacitor not only has a compact shape, more importantly, can be completed in a very short period of time, its charge and discharge speed faster than the standard battery hundreds of times or even thousands of times.
From the above, we can see that the advantages of graphene in the development of ultracapacitors are extremely obvious, and the development and application of the fusion of the two will be the focus of future research and development. At the same time, the US National Energy Administration predicts that the size of supercapacitors in the global market is expected to grow from 4 billion U.S. dollars in 2007 (about 243.7 billion yuan) to 12 billion U.S. dollars in 2013 (about 73.1 billion yuan). A supercapacitor made of olefin as an electrode will greatly improve the performance. It can be expected that with the growth of modern supercapacitor application market, the scale of graphene market is expected to expand at the same time. In the future, the two will complement each other and move forward together.
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