Potassium ion batteries have attracted much attention in the field of large-scale electrochemical energy storage due to their abundant resources, low cost, performance safety, and environmental non-toxicity. However, drawbacks such as large atomic weight and radius of potassium ion and short cycle life limit its practical application. The performance of cathode materials is a critical factor of the potassium ion battery, which directly affects the battery energy density, cycle life, and safety. Nevertheless, inorganic cathode materials play an important role in the research of potassium ion battery cathode materials. Herein, we review the current development of inorganic cathode materials targeting for the exploration and development of high-performance potassium ion batteries on introducing (i) inorganic cathode materials including Prussian blue and its analogs, layered metal oxides, and polyanionic inorganic materials, (ii) the crystal structure, storage mechanism and modification of electrode materials, (iii) the intrinsic relationship between material composition, structure and electrochemical performance. This review not only is an amalgamation of different viewpoints in reference works but also contains concise perspectives and strategies.

钾离子电池以其资源丰富、成本低廉、性能安全、环境无毒等优点在大规模电化学储能领域备受关注。但钾离子的原子量大、半径大、循环寿命短等缺点限制了其实际应用。正极材料的性能是钾离子电池的关键因素，直接影响电池的能量密度、循环寿命和安全性。然而，无机正极材料在钾离子电池正极材料的研究中发挥着重要作用。在此处，金属氧化物和聚阴离子无机材料，（ii）电极材料的晶体结构、储存机理和改性，（iii）材料组成、结构和电化学性能之间的内在关系。这篇评论不仅是参考文献中不同观点的融合，而且包含简洁的观点和策略。