In consideration of the abundance of sodium resources, sodium ion batteries (SIBs) have been revisited recently and are considered as a substitution for lithium ion batteries (LIBs). Among all the proposed anodes for SIBs, metal selenides labeled as high theoretical capacity materials have aroused the interest of battery researchers. However, as conversion/alloying based electrode materials, metal selenides suffer from a severe volume change during cycling, thus leading to kinetic problems and poor electrochemical stability, which restrain their further application in SIBs. Therefore, modification strategies such as coupling with carbonaceous material, designing unique structure, selecting an upper cut-off voltage, optimizing the composition of electrolyte, controlling the composition of the material etc. have been adopted to alleviate the volume change issue of metal selenides electrodes. In this article, the research progresses on the metal selenides as electrodes for SIBs are comprehensively reviewed and the difference and necessity of each metal selenide from the perspectives of structure and conductivity are emphasized. The summarization of metal selenides contains the synthesis methods, modification methods for performance improvement, corresponding reaction mechanism and performance in full-cell system. Finally, a conclusion with the challenges and outlook of metal selenides in the field of SIBs is also presented.

考虑到钠资源的丰富性，最近已经对钠离子电池（SIB）进行了重新研究，并被认为可以替代锂离子电池（LIB）。在所有拟议的SIB阳极中，标有高理论容量材料的金属硒化物引起了电池研究人员的兴趣。然而，作为基于转化/合金的电极材料，金属硒化物在循环期间遭受严重的体积变化，因此导致动力学问题和差的电化学稳定性，这限制了它们在SIB中的进一步应用。因此，需要采取一些修改策略，例如与含碳材料耦合，设计独特的结构，选择上限截止电压，优化电解质的组成，控制材料的组成等。已经采用以减轻金属硒化物电极的体积变化问题。本文综述了金属硒化物作为SIBs电极的研究进展，并从结构和导电性的角度强调了每种金属硒化物的区别和必要性。金属硒化物的概述包括全细胞系统的合成方法，性能改进的修饰方法，相应的反应机理和性能。最后，还提出了有关金属硒化物在SIBs领域中的挑战和前景的结论。