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To date, some start\u2010up companies have released their first\u2010generation SIBs cathode materials. Among them, phosphate compounds, particularly iron (Fe)\u2010based mixed phosphate compounds, present great potential for commercial SIBs owing to its low cost, environment friendly. In this perspective, a brief historical retrospect is first introduce to the development of Fe\u2010based mixed phosphate cathodes in SIBs. Then, the recent development about this kind of cathode has been summarized. One of the iron\u2010based phosphate materials, Na<jats:sub>3<\/jats:sub>Fe<jats:sub>2<\/jats:sub>(PO<jats:sub>4<\/jats:sub>)P<jats:sub>2<\/jats:sub>O<jats:sub>7<\/jats:sub>, is used as an example to roughly calculate the energy density and estimate the cost at the cell level to highlight their advantages. Finally, some strategies are put up to further increase the energy density of SIBs. 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