Sodium and Potassium Storage Behaviour in AgNbO3 Perovskite

Abstract

In this work, we report on the investigation the perovskite-type AgNbO₃ as a model negative electrode for sodium and potassium systems. We demonstrated that during the initial discharge, regardless of the inserted cation, the material undergoes an activation mechanism that induces a crystalline-to-amorphous transition. This transition, in turn, leads to an enhancement of the electrode capacity. At 5 A g⁻¹ sodium-ion AgNbO₃ and Potassium-ion AgNbO₃ display capacities of 81 mAh g⁻¹ and 60 mAh g⁻¹, respectively. Furthermore, both electrodes display good cycling stability and efficiency over 350 cycles at 1 A g⁻¹.