Solution-Based Suspension Synthesis of Li2S-P2S5 Glass-Ceramic Systems as Solid-State Electrolytes: A Brief Review of Current Research.

ABSTRACT

All-solid-state batteries are set to be the next generation of batteries offering improved performance and safety over current conventional lithium-ion batteries. Glass-ceramic Li2S-P2S5 solid-state sulfide electrolytes are promising contenders to achieve all-solid-state batteries with exceptional ionic conductivity on the order of 10-2 S cm-1. Solid-state processing techniques for synthesizing sulfide solid electrolytes are energetically and time consumptive. However, proposed solution processing techniques offer faster and lower temperature processes rendering them scalable. The chemistries that underly solution processing of sulfide solid electrolytes are still not well understood. This brief review highlights key aspects of current research into solution-based suspension synthesis processing techniques of Li2S-P2S5 sulfide solid electrolytes discussing precursor stoichiometries, solvent selectivity, reaction conditions, chemical impurities, and particle morphology with the intent of promoting further research into solution processing of sulfide solid-state electrolytes.