Interelectrode Talk in Solid‐State Lithium‐Metal Batteries

Abstract Solid‐state lithium‐metal batteries have been identified as a strategic research direction for the electric vehicle industry because of their promising high energy density and potential characteristic safety. However, the intrinsic mechanical properties of solid materials cause inevitable electro‐chemo‐mechanical failure of electrodes and electrolytes during charging and discharging; these failure mechanisms include lithium penetration and formation of cracks and voids, which pose a serious challenge for the long cycle life of solid‐state lithium‐metal batteries. Here, a short overview of the recent advances with a view to understand this challenge is provided. Furthermore, new insights into the cross‐talk behavior between the cathode and lithium‐metal anode are provided based on the non‐uniform Li + flux inducing interactional electro‐chemo‐mechanical failure. Furthermore, guidelines for designing stable solid‐state lithium‐metal batteries and research directions to figure out the interelectrode‐talk‐related electro‐chemo‐mechanical failure mechanism are presented, which can be significant for accelerating the development of solid‐state lithium batteries.