Li 1.875 Na 0.125 FeSiO ₄ cathode prepared via a wet ball‐milling using ferric iron sources: Storage, regeneration and performance

Li 1.875 Na 0.125 FeSiO 4 with polyvinylpyrrolidone (PVP)‐derived carbon was synthesized using wet ball‐milling followed by high‐temperature calcination. The results show that the combined effect of PVP carbon and sodium doping significantly enhances the material's resistance to oxidation and deliquescence. Furthermore, secondary calcination effectively regenerates the stored materials, achieving higher phase purity compared to the initial synthesis. The coin cells with regenerated cathodes exhibit unique continuously increasing capacity with cycling, attributed to the mild agglomeration effect of secondary calcination. Notably, the Li 1.875 Na 0.125 FeSiO 4 /Li cell can maintain a discharge capacity of 166.7 mAh·g −1 after 100 cycles while preserving its crystal characteristics. This work offers novel strategies for enhancing storage protection and optimizing the synthesis of iron‐based silicate electrodes.