Slow charging speed and short driving range are the main factors restricting the development of electric vehicles. Recently, Professor Ji Xingxing’s research group of University of science and technology of China, in cooperation with UCLA and Institute of chemistry, Chinese Academy of Sciences, has developed a new type of black phosphorus composite material. About 80% of the electricity can be recovered after 9 minutes of charging, making it possible for lithium-ion batteries with the advantages of fast charging, high charge capacity and long life. < p > < p > black phosphorus is an allotrope of white phosphorus. Its special layered structure endows it with strong ionic conductivity and theoretical high charge capacity. It is a potential “fast charging” electrode material. However, black phosphorus is prone to damage from the edge of the layered structure, and the measured performance is far below the theoretical expectation. Recently, Ji Xingxing team has adopted the “interface engineering” strategy to connect black phosphorus and graphite through phosphorus carbon covalent bonds, which not only stabilizes the material structure, but also improves the internal lithium ion conductivity of black phosphorus graphite composites. However, the electrode material will be wrapped by the chemical substances decomposed by the electrolyte during the working process, and some substances prevent lithium ion from entering the electrode material, just as the dust on the glass surface hinders the light penetration. The joint research team used lightweight polymer gel as a dust-proof coat to “wear” on the surface of the black phosphorus graphite composite, enabling lithium ions to enter smoothly. < / P > < p > “we use the conventional process route and technical parameters to make the black phosphorus composite electrode. The results of laboratory measurement show that about 80% of the charge can be recovered after 9 minutes of charging, and 90% of the charge capacity can still be maintained after 2000 cycles According to Xin Sen, a researcher at the Institute of chemistry, Chinese Academy of Sciences, if large-scale production of this material can be realized, matching cathode materials and other auxiliary materials can be found, and the optimized design of cell structure, thermal management and lithium evolution protection, lithium-ion batteries with energy density of 350 Watt hours per kilogram and fast charging capacity will be obtained. < p > < p > it is understood that a lithium-ion battery with an energy density of 350 Watt hours per kilogram can make the driving range of electric vehicles close to 1000 kilometers. Combined with the rapid charging ability, the user experience of electric vehicles will be greatly improved. < / P > < p > “we hope to find an electrode material that can not only give the industry expectations in terms of comprehensive performance indicators, but also adapt to the industrial battery production process.” Professor Ji Xingxing said that his team will further understand the basic scientific issues such as microstructure, physical and chemical properties and electrochemical reaction process of the new material, understand the performance requirements of the industry for battery materials, and promote the application and development of new materials in electric vehicles, consumer electronics and other industries. Privacy Policy