Charge 80% in 9 minutes? New materials enable fast charging of lithium batteries?

The reporter learned on October 14 that the research group of Professor Ji Hengxing of the University of Science and Technology of China, in cooperation with the University of California, Los Angeles, the Institute of Chemistry of the Chinese Academy of Sciences and other institutions, has achieved a major breakthrough in the research of new lithium battery electrode materials: a newly designed black phosphorus composite The material makes it possible for lithium batteries to have high capacity, fast charging and long life. The results were published in the journal 'Science'. Nowadays, electric vehicles are becoming more and more popular in the market, but the long charging time is also prohibitive. Traditional fuel vehicles can extend the range by 500 kilometers with full fuel in just 5 minutes, while the most advanced electric vehicles currently on the market need to 'wait' for an hour to recharge to achieve the same range extension effect. The development of high-capacity lithium batteries with fast charging capabilities has always been an important goal of the electric vehicle industry. This latest research by the University of Science and Technology of China has made mankind one step closer to this goal. The first author of the thesis, Dr. Hongchang Jin, analyzed: 'In lithium batteries, energy enters and exits the battery through the chemical reaction between lithium ions and electrode materials. Therefore, the conductivity of the electrode materials to lithium ions is the key to determining the charging speed; on the other hand, the unit mass or The amount of lithium ions contained in the volume of the electrode material is also an important factor. 'Black phosphorus is an allotrope of white phosphorus. The special layered structure gives it strong ion conductivity and high theoretical capacity, which is a great potential satisfaction. Electrode material required for fast charging. However, black phosphorus is prone to structural damage starting from the edge of the layered structure, and the measured performance is far lower than theoretical expectations. For this reason, Ji Xingxing’s team adopted an “interface engineering” strategy to connect black phosphorus and graphite through phosphorus-carbon covalent bonds, which stabilized the material structure while improving the conductivity of the black phosphorus-graphite composite material to lithium ions. In view of the fact that the electrode material will be enveloped by the chemical substances gradually analyzed by the electrolyte during the working process, some substances will prevent the lithium ions from entering the electrode material, just as the dust on the glass surface hinders the penetration of light. The research team used a thin polymer gel to make a dust-proof coat and 'wore' on the surface of the black phosphorous graphite composite material to allow lithium ions to enter smoothly. 'We use the conventional process route and technical parameters to make the black phosphorous composite material into the electrode sheet. The measurement results of the laboratory stated that the electrode sheet can recover about 80% of the electricity after 9 minutes of charging, and it can still maintain 90% after 2000 cycles. Capacity.' The co-first author of the paper and researcher Xin Sen of the Institute of Chemistry of the Chinese Academy of Sciences said, “If large-scale processing of this material can be achieved, matching cathode materials and other auxiliary materials can be found, and the cell structure, thermal Optimized design of management and lithium protection, etc., will hopefully obtain lithium batteries with an energy density of 350 Wh/kg and fast charging capabilities.' Such lithium batteries can make the driving range of electric vehicles close to 1,000 kilometers, and Tesla Model S has a driving range of 650 kilometers when fully charged. The fast charging capability will increase the user experience of electric vehicles to a higher level. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: What are the problems and challenges from lithium batteries to sodium ion batteries?