Interface Reaction Design and AI Modulation for High Current Densities in Solid-State Alkali-Metal Batteries

Interface reaction between alkali metal (dendrite) and solid electrolytes was largely neglected in previous works in understanding failure mechanisms of solid state batteries. Here we show that the effect is indeed critical to understanding the interaction between alkali metal (dendrite) and sulfide solid electrolytes in many battery devices. The bahvior of such interface reactions show strong materials and device dependence. A careful understanding of the effect and further utilization of it in the battery device design can lead to significant increase of current densities in battery cycling by magnitude orders. We compare experiemntal evidences with computational/theoretical modeling in the discussion, and show an equally surprising result that AI modulation can greatly change such interface behavior.