(Invited) Ion-Exchange Route for the Cathode Development of Na-Ion Batteries

Abstract

Ion-exchange reactions are frequently used to develop novel metastable electrode materials for alkali-ion batteries that cannot be synthesized (or difficult to synthesize) using direct chemical reactions. We have recently demonstrated that potassium (K)-containing compounds can be good Na+-hosting cathode materials that exhibit good electrochemical performance.[1-2] In this presentation, we will discuss, with layered oxide and polyanionic compounds as model systems, how K+-to-Na+ ion exchange occurs and how the K-containing structure benefits the electrochemical Na+ intercalation and deintercalation properties.