State Key Laboratory of Material Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, China.
ACS Appl Mater Interfaces. 2017 Jan 18;9(2):1536-1541. doi: 10.1021/acsami.6b13421. Epub 2017 Jan 6.
Pyrite FeS 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 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 through voltage control (0.5-3 V), binder choice, and graphene coating. The FeS electrode with the synergistic approach exhibits high specific capacity (524 mA h g), long cycle life (87.8% capacity retention after 800 cycles), and excellent rate capability (323 mA h g at 5 A g). The results prove that a synergistic approach can be applied in the micron-sized sulfides to achieve high electrochemical performance.
黄铁矿(FeS) 因其高容量、低成本和丰富的资源而被广泛用作钠离子电池的阳极材料。然而，微米级的 FeS 通常循环性能较差，这是由于结构塌陷、活性材料剥落和硫溶解所致。在这里，我们采用协同方法通过电压控制（0.5-3 V）、选择粘结剂和石墨烯涂层来提高微米级 FeS 的储钠性能。采用协同方法的 FeS 电极具有高比容量（524 mA h g）、长循环寿命（800 次循环后容量保持率为 87.8%）和优异的倍率性能（在 5 A g 时为 323 mA h g）。结果证明，协同方法可应用于微米级硫化物中，以实现高电化学性能。
