Stabilizing a High-Energy-Density Rechargeable Sodium Battery with a Solid Electrolyte

The cycling performance at 60 degrees C of a Na2MnFe(CN)(6)/Na cell with a ceramic solid electrolyte is compared with that of a cell with an organic-liquid electrolyte operating at room temperature. Analysis of the electrode-electrolyte interfaces after charge-discharge cycling showed that a sodium-metal anode that wets the solid electrolyte can be plated and stripped reversibly dendrite free and that the dissolution of the cyano-perovskite Na2MnFe(CN)(6) cathode that occurs with an organic-liquid electrolyte is eliminated with the utilization of the solid electrolyte. This demonstration indicates that a high-energy-density and low-cost sodium rechargeable battery can be competitive for large-scale electric energy storage where both the anode and cathode problems are solved in an all-solid-state battery.