Solid-state batteries: The interfacial challenge to replace liquid electrolytes

For electric vehicles to completely replace combustion-powered vehicles, improved safety, higher energy and power densities than those possible with the current generation of lithium-ion batteries are required. Thus, researchers have steered their attention to the development of lithium metal batteries (LMB) which use solid-state electrolytes. These batteries often still include a small fraction of liquid electrolytes to enable the ionic transfer processes across interfaces inside these batteries. This chapter presents studies examining the different interfacial resistances in LMBs and highlights the use of “catholytes” as one of the most promising techniques that could enable solid-state batteries to become totally independent from the use of liquid electrolytes.