Porous Mixed Ionic Electronic Conductor Interlayers for Solid-State Batteries

Rechargeable solid-state batteries (SSBs) have emerged as the next-generation energy storage device based on lowered fire hazard and potential of realizing advanced battery chemistries, such alkali metal anodes. However, ceramic solid electrolytes (SEs) generally limited capability in relieving mechanical stress are not chemically stable against body-centered cubic metals or their alloys with minor solute elements ( ? -phase). Swelling-then-retreating -phase often causes instabilities SE fracture corrosion well loss electronic/ionic contact, which leads to high charge-transfer resistance, short-circuiting, etc. These challenges called for cooperation from other classes materials novel nanocomposite architectures preserving essential contacts while minimizing detrimental disruptions. In this review, we summarize recent progress addressing these issues by incorporating mixed ion-electron conductor (MIEC) porous interlayers insulator (IEI) binders, addition (e.g., current collectors) that traditional SSB components. particular, focus providing theoretical interpretations how open nanoporous MIEC manipulate deposition stripping behavior thereby suppress instabilities, referring fundamental thermodynamics kinetics governing nucleation growth -phase. The review concludes describing avenues future design SSBs.