A strategy to develop air stable sodium Iron borate as high voltage cathode material and its mechanistic study

To reach a competitive product in the battery market, the energy density of sodium ion battery needs to be increased by augmenting either the voltage or specific capacity, exploring the advanced electrode materials. Although anode materials have made considerable progress in obtaining the specific capacity, further development is required. The holdup in the sodium ion battery development lies in the progress of new cathode materials which substantially decides the final energy density and cost of the battery. The cathode materials are generally classified into four categories like layered oxides, polyanionic compounds, organic and Prussian blue analogues. Though each of these have their own benefits and drawbacks, working towards the commercially viable material will be a right choice. Polyanion materials are low cost, with robust framework and exhibits high operating voltages, due to the inductive effect of the polyanion group: a suitable choice over other cathode materials.