Abstract In this work, we demonstrate the FeS2/MoS2 composite embedded in rGO nanosheets (FeS2/MoS2-rGO composite) as an anode material for sodium-ion battery. The FeS2/MoS2 composite material was synthesized by one step hydrothermal method, and the prepared particles were wrapped by reduced graphene oxide (rGO) nanosheets, which facilitated the electronic transport between the particles, and suppressed the volume expansion of active materials as well as the polysulfide dissolution into the electrolyte during cycling. The FeS2/MoS2-rGO composite electrode delivered a high initial discharge capacity of 468.0 mA h g−1 and exhibited good cycling stability at a current density of 100 mA g−1. Due to the pseudocapacitive behavior of FeS2/MoS2-rGO electrode, a high reversible capacity of 346.5 mA h g−1 was achieved at 3000 mA g−1, which was much higher than those of FeS2, MoS2 and FeS2/MoS2 composite electrodes. The sodium-ion full cell assembled with FeS2/MoS2-rGO composite anode and Na3V2(PO4)2F3 cathode exhibited a high reversible capacity with good cycling stability, which demonstrates that the prepared FeS2/MoS2-rGO composite can be used as a promising anode material for sodium-ion batteries.

中文翻译：

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轻松合成缠绕在 rGO 纳米片上的 FeS2/MoS2 复合材料作为钠离子电池的高性能负极材料

摘要 在这项工作中，我们展示了嵌入 rGO 纳米片的 FeS2/MoS2 复合材料（FeS2/MoS2-rGO 复合材料）作为钠离子电池的负极材料。FeS2/MoS2 复合材料采用一步水热法合成，制备的颗粒被还原氧化石墨烯 (rGO) 纳米片包裹，促进了颗粒之间的电子传输，抑制了活性材料的体积膨胀以及多硫化物在循环过程中溶解到电解液中。FeS2/MoS2-rGO 复合电极具有 468.0 mA hg-1 的高初始放电容量，并在 100 mA g-1 的电流密度下表现出良好的循环稳定性。由于 FeS2/MoS2-rGO 电极的赝电容行为，在 3000 mA g-1 下实现了 346.5 mA hg-1 的高可逆容量，远高于 FeS2、MoS2 和 FeS2/MoS2 复合电极。FeS2/MoS2-rGO复合负极和Na3V2(PO4)2F3正极组装的钠离子全电池具有高可逆容量和良好的循环稳定性，表明制备的FeS2/MoS2-rGO复合材料可用作有前景的负极钠离子电池材料。