Oxide cathodes for sodium‐ion batteries: Designs, challenges, and perspectives

Abstract Sodium‐ion batteries (SIBs), which are an alternative to lithium‐ion (LIBs), have attracted increasing attention due their low cost of Na resources and similar storage mechanism LIBs. Compared with anode materials electrolytes, the development cathode lags behind. Therefore, key improving specific energy promoting application SIBs is develop high‐performance sodium intercalation materials. Transition‐metal oxides one most promising for owing excellent density, high discharge capacity, environmentally friendly nature. In present work, latest progress in research transition‐metal summarized. Moreover, existing challenges discussed, a series strategies proposed overcome these drawbacks. This review aims at providing guidance metal next stage.