It is not a dream to fully charge an electric car in 10 minutes

Recently, Professor Ji Hengxing’s research group and collaborators of the University of Science and Technology of my country have made a major breakthrough in the research of new lithium battery electrode materials-the newly designed black phosphorus composite material makes lithium batteries with high capacity, fast charging and long life. Become possible, the results have been published in the 'Science' magazine. The research results are also expected to solve the current problem of long charging time for electric vehicles. The electrode material determines the charging speed. According to Professor Ji's analysis, the research result is about a new type of electrode material used in lithium batteries. Everyone is familiar with lithium batteries. It is an invention that changed people's lifestyles. People hope that mobile phones will become thinner and lighter. A key factor in determining whether a mobile phone is thin or light is the size and weight of the battery. People hope that the charging time of an electric vehicle is equivalent to the time required to refuel a petrol vehicle. But the current best technology can only make the electric car fully charged in about an hour. If you want to increase the battery charging speed, you need a material with a fast electrochemical reaction. One of the very important criteria is whether the electrode material has a strong enough ability to conduct electrons and ions. '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. The first author of the paper, Dr. Hongchang Jin, said: “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; on the other hand, the electrode material per unit mass or volume accommodates The amount of lithium ions is also an important factor. 'The excellent performance of black phosphorous composites is based on previous studies. The team of researchers found that black phosphorous is an excellent choice. Firstly, its theoretical capacity is very high, second only to single crystal silicon or metallic lithium; secondly, as a semiconductor material, it has a strong ability to conduct electrons; thirdly, black phosphorus has a layered structure, and lithium ions can be contained in black phosphorus. Fast conduction between the layers of the sheet. The excellent properties of these three aspects make black phosphorus a very promising electrode material that can realize fast charging of lithium batteries. The ideal is full, but the reality is more skinny. At present, a series of studies have found that there is still a certain gap between the comprehensive performance indicators of black phosphorus and expectations. To solve this problem, on the one hand, the team researchers connected black phosphorus and graphite through carbon-phosphorus covalent bonds to make its structure more stable and the process of lithium ions entering the black phosphorus particles easier, which greatly improved Improved the lithium ion conduction that may have been limited; on the other hand, they put a layer of 'clothing' on the composite material to make the electrode more stable in the surrounding environment filled with electrolyte, which is more suitable for the entry of lithium ions . After such optimization, this black phosphorus composite material has a breakthrough in performance. It is expected to be fully charged in 10 minutes. 'We use the conventional process route and technical parameters to make the black phosphorous composite material into the electrode sheet. According to the experimental measurement, the electrode sheet can recover about 80% of the electricity after 9 minutes of charging. After 2000 cycles It can still maintain 90% of the 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 targeted Optimized design of cell structure, thermal management and lithium protection protection will hopefully obtain a lithium battery with an energy density of 350 Wh/kg and a fast charging capability.” It is reported that a lithium battery with an energy density of 350 Wh/kg, It can make the mileage of electric vehicles approaching 1,000 kilometers. At present, the Tesla ModelS has a driving range of approximately 650 kilometers after being fully charged. At the same time, the fast charging capability will also increase the user experience of electric vehicles to a higher level. 'Under the premise of comprehensively considering a series of technical indicators that the industry is more concerned about, such as compaction density and surface load, we may be able to fully charge the electric vehicle in about 10 minutes, and can travel about 500 kilometers.' Ji Professor Hengxing said that with such a vision, the scientific research team still has a lot of work to do, especially in terms of basic research and large-scale preparation technology. They are full of hope for the future. On the basis of the new technology, the team will continue to explore at the basic research level and large-scale manufacturing technology. Professor Ji said: 'We will continue to work hard on the existing basis to make the research results in the paper closer to the requirements of the battery industry.' It is not a dream that the electric vehicle can be fully charged in 10 minutes. The new electrode material of the University of Science and Technology of my country promotes fast charging of lithium batteries. Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: New electrode material 'assisted' lithium battery 'fast charge'