Construction of Amorphous FePO₄ Nanosheets with Enhanced Sodium Storage Properties

Two-dimensional (2D) nanomaterials have drawn enormous attention as anode materials for sodium-ion batteries. However, the synthesis of 2D cathode materials for advanced sodium-ion batteries remains a big challenge. Herein, amorphous FePO4 nanosheets are successfully synthesized through a simple template method. The as-synthesized amorphous FePO4 nanosheets possess a mesoporous structure. Electrochemical measurements reveal that the amorphous FePO4 nanosheets exhibit a large initial discharge capacity of 126.4 mAh g–1 at a current density of 20 mA g–1, superior cycling performance (89.8% capacity retention over 100 cycles), and high rate capability (42.1 mAh g–1 at 1000 mA g–1). These results indicate that the amorphous FePO4 nanosheets can serve as a promising cathode material for sodium-ion batteries.