Recent progress in structure study of electrode materials for room-temperature sodium-ion stationary batteries

With the rapid development of renewable energy of wind and solar power and realization of future smart grid, the large-scale energy storage system becomes more and more important. Recently, room-temperature sodium-ion batteries re-attract a great deal of attention due to its low cost and potential application in large-scale energy storage. So far, a large amount of electrode materials have been proposed for sodium-ion batteries. In general, the electrochemical performance of electrodes is determined by its crystal structure. In this review, we summarize the crystal structures of present electrodes and intend to provide insightful guides to electrode material design.