How much do you know about all solid-state lithium batteries?

1. Overview The data in all solid-state lithium batteries are solid-state data and do not contain any liquid. All-solid-state lithium batteries are divided into all-solid-state lithium batteries and all-solid-state metal lithium batteries. The negative electrode of the former does not contain lithium metal, and the negative electrode of the latter does not contain lithium metal. Before liquid lithium batteries, all solid-state metal lithium batteries existed, but the safety issues related to the use of lithium (lithium dendrites) have not yet appeared in the market. See my previous article on Goodenough Weng Wei: John Goody Nafa posted a new post~Reposted to Zhihu According to the development trend of technology, compared with liquid lithium batteries, all solid metal lithium batteries may have the advantages of good safety performance, high energy density, and long cycle life. In recent years, solid electrolyte data, especially sulfide electrolyte data, have made major breakthroughs in ionic conductivity, and all-solid-state lithium battery technology has gradually attracted the attention of research institutions and large companies around the world. 2. Classification of all solid-state lithium batteries With the promotion of all-solid-state lithium batteries, various concepts of all-solid-state or solid-state lithium batteries emerge in endlessly. Solid-state lithium batteries: Some researchers refer to batteries with solid electrolytes and a small amount of liquid electrolyte as high-quality or volume-ratio batteries as solid-state batteries. All-solid-state lithium battery: The battery is composed of solid-state electrodes and solid-state electrolyte data. In the operating temperature range, the battery does not contain any mass and volume fraction of liquid electrolyte. 3. The potential advantages of all solid-state lithium batteries. High safety performance: solid electrolytes replace combustible liquid electrolytes. Solid electrolytes are expected to overcome the emergence of lithium dendrites. High energy density: negative electrode can be metal lithium. Long cycle life: can prevent liquid electrolyte charging and discharging process The formation and growth of the solid electrolyte interface film. Electrochemical window width: up to 5V, suitable for high-voltage positive electrode. Convenient data recovery: no waste liquid, relatively simple processing 4. Disadvantages of all-solid-state lithium batteries. Specific key technical issues: solid electrolyte and The interface between the electrodes: contains large impedance and poor interface compatibility between the anode and electrolyte interface (the space charge layer between the positive electrode material and the electrolyte, the negative electrode material between the diffusion and reaction of the elements and the electrolyte and electrode material charge The interface stress caused by the change of discharge volume), the reaction between the lithium metal anode and the electrolyte; the construction of high-efficiency ion and electron transport channels in the positive electrode data.Specific solution: add the electrode and electrolyte interface modification layer (buffer layer) to the positive electrode data Particles are coated and modified using nanotechnology (data nanoization, micro-nano structure description that changes data) electrolyte modification (replacement of components, data synthesis), etc. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Why can't the chargers of small home appliances be made universal?