Abstract Sodium iron silicate (Na2FeSiO4) has been investigated as a novel cathode material for electrochemical sodium storage due to the abundance of Na and Fe resources, good structure stability and high theoretical capacity. Herein, we report a simple strategy for fabricating the 3D CNTs-decorated Na2FeSiO4 microspheres through a facile spray-drying method. Inside the microspheres, the Na2FeSiO4 nanocrystals are anchored on the CNTs, forming the conductive transport pathways for electrons and Na+-ions. This cathode exhibits a high specific capacity of 168.7 mAh g−1 at 0.1 C and also shows excellent cycling performances at high current rates. Therefore, the as-fabricated 3D composite is an advanced electrode for rechargeable sodium-ion batteries.

中文翻译：

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用Na2FeSiO4纳米晶体锚定的3D导电碳纳米管作为电化学储钠的新型阴极材料

摘要 硅酸铁钠 (Na2FeSiO4) 具有丰富的 Na 和 Fe 资源、良好的结构稳定性和较高的理论容量，已被研究作为一种新型的电化学储钠正极材料。在此，我们报告了一种通过简便的喷雾干燥方法制造 3D CNTs 装饰的 Na2FeSiO4 微球的简单策略。在微球内部，Na2FeSiO4 纳米晶体固定在 CNT 上，形成电子和 Na+离子的导电传输通路。该正极在 0.1 C 下表现出 168.7 mAh g-1 的高比容量，并且在高电流速率下也表现出优异的循环性能。因此，制造的 3D 复合材料是用于可充电钠离子电池的先进电极。