Sodium-ion batteries (SIBs) are considered as one of the most fascinating alternatives to lithium-ion batteries for grid-scale energy storage applications because of the low cost and wide abundance of sodium resources. Among various cathode materials, mixed polyanion compounds come into the spotlight as promising electrode materials due to their superior electrochemical properties, such as high working voltage, long cycling stability, and facile reaction kinetics. In this review, we summarize the recent development in the exploration of different mixed polyanion cathode materials for SIBs. We provide a comprehensive understanding of the structure-composition-performance relationship of mixed polyanion cathode materials together with the discussion of their sodium storage mechanisms. It is anticipated that further innovative works on the material design of advanced cathode materials for batteries can be inspired.

钠离子电池（SIB）被认为是网格规模储能应用中锂离子电池最引人入胜的替代品之一，因为钠成本低廉且钠资源丰富。在各种阴极材料中，混合聚阴离子化合物由于其优越的电化学性能（例如高工作电压，长循环稳定性和便捷的反应动力学）而成为很有前途的电极材料。在这篇综述中，我们总结了在探索用于SIB的不同混合聚阴离子阴极材料方面的最新进展。我们提供了对混合聚阴离子阴极材料的结构-成分-性能关系的全面理解，并讨论了其钠存储机理。