Mechanism of Capacity Fade in Sodium Storage and the Strategies of Improvement for FeS<sub>2</sub> Anode ChenKongyao ZhangWuxing XueLihong ChenWeilun XiangXinghua WanMin HuangYunhui 2016 Pyrite FeS<sub>2</sub> has attracted extensive interest as anode material for sodium-ion batteries due to its high capacity, low cost, and abundant resource. However, the micron-sized FeS<sub>2</sub> usually suffers from poor cyclability, which stems from structure collapse, exfoliation of active materials, and sulfur dissolution. Here, we use a synergistic approach to enhance the sodium storage performance of the micron-sized FeS<sub>2</sub> through voltage control (0.5–3 V), binder choice, and graphene coating. The FeS<sub>2</sub> electrode with the synergistic approach exhibits high specific capacity (524 mA h g<sup>–1</sup>), long cycle life (87.8% capacity retention after 800 cycles), and excellent rate capability (323 mA h g<sup>–1</sup> at 5 A g<sup>–1</sup>). The results prove that a synergistic approach can be applied in the micron-sized sulfides to achieve high electrochemical performance.