What are the applications of lithium-sulfur batteries?

The lithium-sulfur battery, which has the characteristics of high energy density, large capacity, environmental protection, and low cost, is known as the development direction of the next-generation power lithium-ion battery system after the lithium battery. Recently, Li Mingtao's research group from the School of Chemical Engineering of Xi'an Jiaotong University has made a breakthrough in the bottleneck problem that affects the application of lithium-sulfur batteries. It has designed and developed a two-dimensional structure of graphene protective layer cathode material, and obtained a lithium-sulfur battery with long cycle life. The specific principle is that the two-dimensional intercalation structure of g-C3N4/graphene sandwich is like a multilayer anti-shark net built between the positive and negative electrodes of the battery, which can not only block polysulfide from the positive and negative electrodes through the dual use of physics and chemistry. Shuttle between, but also accelerate the diffusion of lithium ions, thereby greatly improving the cycle life of the battery. In my country, the development of lithium-sulfur batteries is relatively late, still in the laboratory research and development stage, and there are very few practical applications. The dissolution of lithium polysulfide, an intermediate product in the charging and discharging process of lithium-sulfur batteries, causes the shuttle effect, which has always been regarded as a key factor limiting its practical application. Dr. Li Qinghai, former vice president of Mengshi Technology, once said that the dissolution and shuttle of polysulfides is the most important and difficult problem for lithium-sulfur batteries, and related improvement work is still in its infancy, but he is optimistic about lithium-sulfur batteries as a kind of High energy density secondary batteries have great development prospects. Compared with the current mainstream ternary NCM lithium battery, the theoretical specific energy of the battery with sulfur cathode is as high as 2600Wh/kg, which is more than ten times that of the currently widely used lithium battery. In addition, sulfur has the advantages of abundant element reserves and low cost. Once it is applied on a large scale, it will greatly help the price of electric vehicles powered by lithium batteries fall. In 2016, the National Development and Reform Commission proposed in the 'Energy Technology Revolution and Innovation Action Plan (2016-2030)' that it is necessary to break through the lithium-sulfur battery technology with an energy density of 300Wh/kg. The bottleneck of the development of power lithium-ion battery has been overcome. The specific energy is much higher than that of the current vehicle power lithium-ion battery. For comparison, the power lithium-ion battery that has been used in batches is based on the 'Action Method to Promote the Development of the Automotive Power Lithium-ion Battery Industry' published in 2017 , And the 'Medium and Long-term Development Plan for the Automobile IndustryThe theoretical energy density of lithium-sulfur batteries exceeds 500Wh/kg, so it is regarded as the development direction of the next-generation power lithium-ion battery system after lithium batteries. In order to solve the practical application of lithium-sulfur batteries, including the team of Academician Qian Yitai of China University of Science and Technology, the team of Wang Haihui of South China University of Technology, the Advanced Energy Storage Materials and Technology Research Group of Qingdao Institute of Energy, Chinese Academy of Sciences, the team of Nanfeng Zheng, a chemist from Xiamen University in my country, and Shanghai Transportation The university’s Wang Jiulin research team has made relevant breakthroughs. Although there are still some problems in the process of achieving the ideal energy density of lithium-sulfur batteries, there are some applications that have high requirements on the thinness of batteries, such as drones, submarines, and power packs carried by soldiers. Since weight is more important than price or life, lithium-sulfur batteries have begun to be put into practical use. 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: What is the low temperature characteristic of the positive electrode material of the lithium battery?