Unlocking the Potential: Na 4 Fe 3 (PO 4 ) 2 (P 2 O 7 ) Supporting the Innovation of Commercial Sodium‐Ion Batteries

Abstract Sodium‐ion batteries (SIBs) are highly anticipated as an efficient energy storage solution in addressing contemporary energy challenges. The pursuit of high‐performance cathode materials is critical for the commercialization of SIBs. Among the contenders, Na 4 Fe 3 (PO 4 ) 2 (P 2 O 7 ) (NFPP) is one of the most promising commercial cathode materials due to its stable structure framework and excellent sodium storage capability. Although the research on NFPP has achieved great progress, especially in the last 10 years, the timely and dedicated summary of the research progress and prospect of this rising star of cathode materials for SIBs has not been reported. This review provides a comprehensive overview of the advancement and prospect of NFPP as commercial cathode material in SIBs. In this review, the crystal structure and sodium storage mechanism of NFPP are examined first. Then, different proposed preparation methods of NFPP have been elaborated in the following section. After that, the optimization strategies are discussed to enhance the sodium storage performance of NFPP cathode material in detail. At last, the gap between current research and the practical application of NFPP is highlighted, and possible future research directions for the commercialization of NFPP cathode material in SIBs are proposed.