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Graphene has been hailed as "a magical material for the 21st century," and due to its unique electrical, mechanical, thermal and optical properties and a high specific surface area, it has received great attention in recent years. European and American governments and IBM, BASF, Bayer, Airbus and Samsung are all actively deploying graphene and its application technology. Graphene is also listed in the “13th Five-Year Plan†of China's new materials industry, further clarifying its strategic position at the national level. Among them, graphene energy storage applications have received special attention and are expected to bring about "subversive" breakthroughs in energy storage technology.
In 2014, the Shanxi Coal Chemistry Research Institute of the Chinese Academy of Sciences and Shanxi Three-dimensional Group Co., Ltd. jointly undertook the “Graphene Energy Storage—High Performance Super Capacitor Technology Development†coal-based low-carbon key scientific and technological breakthrough project. This project is based on advanced graphene materials and adheres to the R&D concept of “Material-to-material, material-to-consumer, and tool-to-useâ€. Through the development of graphene composite electrode materials, super capacitor assembly and application demonstrations, we will create innovative applications for graphene energy storage. chain.
Since the project was established, the Coal Chemical Institute has cooperated with the Jinneng Group's production and research institutes to develop low-cost, controllable production technologies for graphene. It has overcome the technical difficulties of controllable synthesis, purification, and thermal reduction of graphite oxide and developed high-efficiency purification and continuous expansion furnaces and other special equipment. . Complete the tonnage pilot demonstration and form a 10-ton process software package. The product was tested by a third party of the Institute of Electrical Engineering of Tsinghua University and the Chinese Academy of Sciences. The specific surface area of ​​graphene powder was >600m2/g, purity was >99.9wt%, and the technical indicators were far ahead of the domestic ones, leading China's high-quality graphene production technology. At the same time, the Coal Chemical Institute and the three-dimensional group are united to build an international advanced energy-saving dust-free assembly pilot test platform. Developed a green, low-energy water electrode preparation process, solved the problem of dispersion of graphene applications that has been plagued for a long time, mastered the preparation technology of graphene electrode slurry, and reduced the cost by 25%. Breakthrough electrode material uniform controllable coating technology, the formation of high-quality pole pieces, developed a high-power columnar and laminated chip batteries, to provide a guarantee for the demonstration application of graphene supercapacitors. The developed graphene supercapacitors can achieve high power (>7kW/kg), rapid (2 minutes) charge and discharge, and long cycle life (>200,000 times). The products will be applied to the fields of pure electric buses, hybrid vehicles and energy recovery of rail transit. At the same time, they will be used as active energy compensation and energy storage components for applications such as photovoltaics and other new energy grids, wind turbines and smart grids.
The technological breakthrough of this project has established the predominance of graphene energy storage technology at home and abroad, and has formed a good beginning for the “creation†of graphene from “manufactured†to related high-performance products, which will help Shanxi Province and even China’s new energy industry. development of.
Source: Shanxi Provincial Department of Science and Technology