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A NASICON‐type Mn/F dual‐doping Na4Fe3(PO4)2P2O7 cathode material is successfully synthesized via a spray drying method. A medium‐spin of Fe is measured by DFT calculation, X‐ray absorption near edge structure (XANES), temperature‐dependent magnetization susceptibility (M−T) measurement, and electron paramagnetic resonance (EPR) tests. It indicates that the eg orbital occupation of Fe2+ can be finely...
Sodium Storage
In article number 2309701, Xifei Li, Mingjun Wang, and co‐workers report that the electron spin state of Na4Fe3(PO4)2P2O7 cathode can be optimized from low‐spin to medium‐spin via Mn/F dual‐doping, thus decreasing the band gap and increasing the electronic conductivity of the material, which thereby results in superior sodium storage.