Graphene is the most new material found in the 21st century, with excellent electron mobility, high strength, good conductivity / thermal conductivity, high transmittance, low quality and other excellent features. It is expected to lead to changes in related industries in the new energy, petrochemical, electronics Information, composite materials, bio-medicine, energy saving and environmental protection and other traditional areas and emerging applications. As a result, graphene has become a strategic new material to lead the new generation of industrial technology revolution.
Graphene can be used in the field of batteries. The main use of graphene special two-dimensional flexible structure and its high ion and electronic conductivity and battery materials to build a composite system to improve its cycle characteristics and high current discharge characteristics.
In graphene / activated carbon composite electrode, the thoughs that “the more additive amount of graphene, the better properties will be” is not correct because the excess of graphene will lead to the blockage of the pore and the capacity decreased. The amount of added 2% of the mass fraction is appropriate. In addition, the graphene sheet size also affects the performance of the composite electrode. If graphene sheet is too small, it will be easer to be adsorbed in the large pore material within the channel, and ultimately lead to material pore structure and specific surface area changes, the general size and the size of activated carbon close to the most good.
Its structure is perfect. Its exposed surface can be fully infiltrated and used by the electrolyte, with high specific capacity, and suitable for high-current rapid charge and discharge; it is stable in physical and chemical properties, which can maintain high stability at high operating voltage; It has excellent electrical conductivity, which can promote the rapid transmission of ions / electrons, reduce internal resistance, improve the super-capacitor cycle stability. Therefore, graphene is considered one of the high voltage, high capacity, high power supercapacitor electrode materials.
With the super capacitor similar to the excellent conductivity of ultra-thin two-dimensional graphene nano-materials can be lithium-ion battery electrode active material particles to form two-dimensional conductive contact in the electrode to build three-dimensional conductive network, can greatly enhance the battery performance. A large number of experimental results show that the graphene conductive additive can significantly reduce the battery resistance, improve the battery charge and discharge performance, and significantly extend the battery cycle life; at the same time can increase the capacity of the active material grams play, thereby enhancing the battery capacity; In addition, the battery containing graphene conductive agent in the high charge and discharge process of heating relatively small, the battery surface temperature is relatively low, which is conducive to improving the safety of the battery.
Graphene as the next generation of excellent energy storage materials, has been in the field of super capacitors and batteries that have been confirmed. China leads the world in its industrialization application. But it has not really from the R & D to commercialization of the leap yet. In the future, the quality and cost of graphene materials is still a serious constraint on its application in the field of large-scale energy storage core elements.
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