(Invited) A Dive into the Complex Mechanisms That May or May Not Increase Li/Na Mobility in Solid State Conductors

The conductivity of Li and Na has achieved remarkably high values in some materials, higher than what has been achieved in liquid electrolytes. Because there is no mobile solvation shell in solid-state conductors, the maximum of conductivity is essentially unlimited. I will discuss our current understanding of the compositional and structural elements that contribute to very high alkali ion mobility. This will include a discussion, of activated complexes that create concerted motion, possible high-entropy effects, the effect of (poly)anions, and structural topology.