Experts explain the commercial use and challenges of all solid-state lithium-ion batteries

How far are all solid-state lithium-ion batteries from being highly commercialized? Recently, Assistant Professor Liu Wei of Shanghai University of Science and Technology, Professor Cui Yi of Stanford University and others published an article in the journal 'Chemistry' under CellPress to sort out the development of all-solid-state lithium metal batteries in recent years, and summarized several kinds of improved solid electrolyte conductivity and The latest approach to reduce the high impedance of the interface, discusses the use of solid electrolytes in cathode materials such as embedded compounds, sulfur and oxygen, as well as the key challenges and future development of all-solid-state lithium metal batteries. As a widely used energy storage device, lithium-ion battery has the characteristics of high energy density, good cycle stability and light weight. However, it is still unable to meet the high energy density requirements of electric vehicles and smart grids. If an all-solid-state lithium metal battery using a solid electrolyte and a metal lithium negative electrode is used, it is expected to deal with issues such as energy density and safety. However, the solid electrolyte itself has low conductivity, and its electrochemical instability and incompatibility with the electrode result in a large interface impedance between the electrolyte and the electrode, which restricts its commercialization process. Liu Wei told my country Science News that at present, higher interface resistance is an important reason for restricting the commercialization of all-solid-state lithium-ion batteries. Ways to reduce interface resistance include adding buffer layers and artificial passivation layers, and mixing solids in the electrodes. Electrolyte materials, etc. The commercial use of all-solid-state lithium-ion batteries is still to be studied, but it can be expected in the future. The article also discussed the latest all-solid-state lithium metal batteries that use embedded compounds, sulfur and oxygen cathodes. The use of solid electrolytes instead of electrolytes can deal with the dissolution of polysulfides and the openness of lithium-air batteries, which can greatly increase the energy density and is expected to be used in the next generation of high-energy energy storage devices.