10.1021/acsami.6b13421.s001 Kongyao Chen Kongyao Chen Wuxing Zhang Wuxing Zhang Lihong Xue Lihong Xue Weilun Chen Weilun Chen Xinghua Xiang Xinghua Xiang Min Wan Min Wan Yunhui Huang Yunhui Huang Mechanism of Capacity Fade in Sodium Storage and the Strategies of Improvement for FeS<sub>2</sub> Anode American Chemical Society 2016 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 2016-12-23 00:00:00 Journal contribution 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.