Recent advances in electrochemical impedance spectroscopy for solid-state batteries

Electrochemical impedance spectroscopy (EIS) is a powerful technique widely used for characterizing electrochemical systems, especially in the investigation of ion diffusion, electrochemical reactions, and charge transfer within lithium-ion batteries. Solid-state batteries (SSBs), envisioned for their potential to achieve high energy density and enhanced safety, comprise essential components-namely, a high-voltage cathode, a solid-state electrolyte (SSE), and a Li metal anode. While SSBs hold great promise, the utilization of EIS in studying SSBs is still in its infancy. Since various SSB systems exhibit different electrolyte properties (e.g., ionic conductivity, ionic transport activation energy, and ionic…