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Self‐Healing Properties of Alkali Metals under “High‐Energy Conditions” in Batteries

With the development of high‐energy‐density metal batteries, dendrite growth has become a bottleneck for the further improvement of alkali metal electrodes. In this study, the self‐healing performance of dendrites under “high‐energy conditions” are predicted and verified. Initially, the driving force of self‐healing is analyzed based on surface energy. Theoretically, the activation energy for atom diffusion, which contributes to the resistance of self‐healing, is quantitatively calculated. Moreover, to illustrate self‐healing in Li, Na, and K electrodes, electrochemical curves, in situ optical images, and SEM images are obtained at different temperatures and current densities. Based on the results, it is concluded that K dendrites under “high‐energy conditions” (i.e., at high temperatures and high current densities) possess the highest self‐healing ability and reparability. Consequently, the self‐healing properties of alkali metals under high‐energy conditions are theoretically and experimentally examined and confirmed.