The main challenges of commercialization of all solid-state lithium batteries

How far is the commercialization of all-solid-state lithium batteries? 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 ways to improve the conductivity of solid electrolytes. And the latest ways to reduce the high impedance of the interface, the study of solid electrolytes for 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 are discussed. 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 anode is used, it is expected to solve the problems of energy density and safety. However, the solid electrolyte itself has low conductivity, and its electrochemical instability and incompatibility with the electrode lead to a large interface impedance between the electrolyte and the electrode, which restricts its commercialization process. At present, higher interface resistance is the main reason that restricts the commercialization of all solid-state lithium batteries. Ways to reduce the interface resistance include adding a buffer layer and an artificial passivation layer, and mixing solid electrolyte materials in the electrodes. The commercial use of all solid-state lithium batteries is still to be studied, but the future can be expected. Liu Wei told the China Science Daily. 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 solve the problems of polysulfide dissolution and openness of lithium-air batteries, and can greatly increase the energy density, and is expected to be used in the next generation of high-energy energy storage devices.