Progress in research on growth and inhibition of lithium dendrites in all-solid-state lithium batteries

Recently, Fang Qianfeng, a researcher at the Institute of Internal Friction and Solid Defects, Institute of Solid State Physics, Hefei Institute of Materials Science, Chinese Academy of Sciences, designed a solid-state battery with an asymmetric structure to study the deposition and transport of lithium ions in solid-state batteries. . The growth and inhibition mechanism of lithium dendrites in lithium batteries provide an important reference. Related research results were published in the 'Power' magazine under the title of Li7La3Zr2O12 electrolyte intracrystalline growth of lithium metal and the uniform distribution mechanism of lithium metal. Lithium-ion batteries have high energy density, strong stability and long cycle life, and have been widely used as commercial and efficient energy storage devices. However, since flammable organic electrolytes are used in commercial lithium-ion batteries, when the battery is in a state of high temperature, short circuit, overcharge or physical damage, it is easy to cause a fire or even an explosion. Therefore, the use of non-flammable inorganic solid electrolytes instead of liquid electrolytes is one of the most effective methods to solve the safety problems of lithium batteries. However, because lithium ions spontaneously form dendritic lithium dendrites during the deposition process of the negative electrode, their sharp structure is easy to pierce the separator, leading to battery short circuits and potential safety hazards. Therefore, the use of inorganic solid electrolytes instead of liquid organic electrolytes can effectively inhibit the growth of lithium dendritic lithium during charging and discharging, which can better solve the safety problems of lithium-ion batteries and correctly understand the deposition and transport of lithium ions in solids. The process of solid-state batteries is essential to inhibit the growth of lithium dendrites and prevent battery short circuits. Therefore, the researchers designed a solid battery with an asymmetric structure by designing the metal lithium electrodes on both sides of the electrolyte to be perpendicular to each other (Figure 1a), and inferred that lithium is deposited on the surface of the electrolyte by observing the state of lithium. The transport process of ions inside the electrolyte. At the same time, the Au atomic layer is sputtered on the central area of u200bu200bthe electrolyte surface layer, and compared with the area of u200bu200bthe unsputtered Au atomic layer, the influence of the Au atomic layer on the lithium deposition law obtains ions. The results show that the distribution of electrons on the surface of the electrolyte directly affects the transport path of lithium ions in the electrolyte (Figure 1b), so that the lithium ions from the upper surface of the electrolyte are divergently distributed in the electrolyte. Further analysis found that in the unsputtered Au sputtering area, the lithium ion deposited in the irregular area (the area on the left side of the blue box in Figure 1a) showed an enriched distribution state, which would induce lithium dendrites Growth and cause a short circuit. . In the area where the Au atomic layer is sputtered, the lithium ion deposition shows a uniform distribution of spherical particles (the red box area and the right area in the blue box in Figure 1a), which effectively suppresses the lithium caused by the growth of Al ion. Potential safety hazards of lithium dendritic batteries. The development of this work provides a theoretical and experimental basis for optimizing the interface performance and safety performance of all solid-state batteries. This research work was supported by the National Natural Science Foundation of China and the Anhui Natural Science Foundation. 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: Common faults of AGV lithium battery packs, safe use of AGV lithium battery packs