Mechanism of Capacity Fade in Sodium Storage and the Strategies of Improvement for FeS<sub>2</sub> Anode Kongyao Chen Wuxing Zhang Lihong Xue Weilun Chen Xinghua Xiang Min Wan Yunhui Huang 10.1021/acsami.6b13421.s001 https://acs.figshare.com/articles/journal_contribution/Mechanism_of_Capacity_Fade_in_Sodium_Storage_and_the_Strategies_of_Improvement_for_FeS_sub_2_sub_Anode/4524683 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. 2016-12-23 00:00:00 mA FeS 2 Anode Pyrite FeS 2 structure collapse capacity sodium storage performance graphene coating anode material sodium-ion batteries FeS 2 electrode approach exhibits Sodium Storage micron-sized sulfides Capacity Fade micron-sized FeS 2 sulfur dissolution electrochemical performance