New electrode material 'assisted' lithium battery 'fast charge'

About 80% of the power can be recovered after 9 minutes of charging, and 90% of the capacity can be maintained after 2000 cycles...The new type of lithium battery electrode material-black phosphorus composite material newly designed by the research group of Professor Ji Hengxing of the University of Science and Technology of my country and collaborators , Making it possible for lithium batteries with high capacity, fast charging capability and long life. The results were published in Science on October 9. As the awareness of environmental protection has taken root in the hearts of the people, electric vehicles have become more and more popular in the market, but the long charging time is prohibitive. Electrode material is one of the key factors that determine battery performance. '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 processing process.' Ji Hengxing said. Jin Hongchang, the first author of the paper and a member of the Ji Xingxing team, analyzed that energy enters and exits the battery through the chemical reaction between lithium ions and electrode materials. Therefore, the conductivity of the electrode material to lithium ions is the key to determining the charging speed; the electrode material per unit mass or volume contains lithium The number of ions is also an important factor. Black phosphorus is an allotrope of white phosphorus. Its special layered structure gives it strong ion conductivity and high theoretical capacity. It is an electrode material with great potential to meet the requirements of 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. Ji Xingxing’s team adopted the “interface engineering” strategy to connect black phosphorus and graphite through phosphorus-carbon covalent bonds, which stabilized the structure while improving the internal conductivity of the material to lithium ions. The team also used a thin polymer gel to make a dust-proof coat 'wearing' on the surface of the composite material so that lithium ions can enter smoothly. 'We use conventional process routes and technical parameters to make black phosphorus composites into electrode sheets.' Xin Sen, co-first author of the thesis and researcher of the Institute of Chemistry of the Chinese Academy of Sciences, analyzed that if large-scale processing of this material can be achieved Matching cathode materials and other auxiliary materials, and optimized design for cell structure, thermal management and lithium evolution protection, will be expected to obtain a lithium battery with an energy density of 350 watt-hours per kilogram and a fast charging capability. The researchers said that on the basis of existing new technologies, they will continue to explore in basic research and scale preparation, and strive to make the research results closer to the actual needs of the battery industry. New electrode material 'assisted' lithium battery 'fast charge' Statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: Tesla Model Y Europe will be equipped with 4680 batteries in Germany. Technical test field