Solid-state batteries have garnered much attention due to their numerous benefits over cells containing liquid electrolytes. For example, thermally stable solid-state electrolytes allow for a paradigm shift in battery-pack design by simplifying thermal management and allowing bipolar stacking. The elimination of cell packaging and thermal management components would dramatically improve the energy density beyond what is possible for a Li-ion battery containing liquid electrolyte. In particular, lithium thiophosphates (LTP) tend to have higher Li⁺-conductivities and are more easily processed than oxide solid-electrolytes, and so they are being considered as a non-volatile and thermally stable solid electrolyte for lithium-ion batteries. From our perspective, we will present some of the challenges associated with solid-state batteries and discuss the research of next generation solid-state technologies.