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Exploring low\u2010cost and high\u2010performance cathode materials is the key to promote the practical application of SIBs. Among various SIBs cathode materials, sodium iron sulfate (NFS) compounds stand out due to their stable three\u2010dimensional (3D) framework structure, high operating voltage, cost\u2010effectiveness, and environmental friendliness. They have received extensive attention from basic research to the industrialization of the results. This article systematically analyzes and discusses the crystal structure, sodium storage mechanisms, preparation methods, and corresponding optimization strategies of various types of NFS materials and reveals the structure\u2013activity relationship between the chemical composition of NFS materials, structural modification and modulation, and performance enhancement. Meanwhile, the key challenges faced by NFS materials are discussed, and the problems to be solved and constructive suggestions are put forward in the process of large\u2010scale industrialization, so as to provide theoretical and technological guidance for the development of low\u2010cost and high\u2010performance cathode materials and the industrialization of SIBs.<\/jats:p>","DOI":"10.1002\/cssc.202500694","type":"journal-article","created":{"date-parts":[[2025,8,6]],"date-time":"2025-08-06T17:59:31Z","timestamp":1754503171000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Recent Advances in Sodium Iron Sulfate Cathodes for Sodium\u2010Ion Batteries: Crystal Structure, Synthesis, and Performance"],"prefix":"10.1002","volume":"18","author":[{"given":"Liangyu","family":"Li","sequence":"first","affiliation":[{"name":"School of Power and Mechanical Engineering Wuhan University  Wuhan 430072 P. R. 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