Solid-state batteries (SSBs) use solid electrodes and a solid electrolyte. The solid-state structure can ensure a stable form during battery usage. While concerning safety, SSBs are the perfect alternative for liquid-electrolyte batteries.

The key component of an SSB is the solid electrolyte, which ensures easy transport of ions but is highly resistant to electrons.

In an ideal case, solid electrolytes should have the features of high Li-ion conductivity, wide electro-chemical windows against cathode and anode materials, and easy synthesis.