Sodium-ion batteries are a potentially low-cost and safe alternative to the prevailing lithium-ion battery technology. However, it is a great challenge to achieve fast charging and high power density for most sodium-ion electrodes because of the sluggish sodiation kinetics. Here we demonstrate a high-capacity and high-rate sodium-ion anode based on ultrathin layered tin(II) sulfide nanostructures, in which a maximized extrinsic pseudocapacitance contribution is identified and verified by kinetics analysis. The graphene foam supported tin(II) sulfide nanoarray anode delivers a high reversible capacity of ∼1,100 mAh g(-1) at 30 mA g(-1) and ∼420 mAh g(-1) at 30 A g(-1), which even outperforms its lithium-ion storage performance. The surface-dominated redox reaction rendered by our tailored ultrathin tin(II) sulfide nanostructures may also work in other layered materials for high-performance sodium-ion storage.

中文翻译：

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纳米片阵列可通过可调伪电容实现超快和高容量的Na离子存储。

钠离子电池是潜在的低成本和安全的替代锂离子电池技术的替代品。然而，由于缓慢的溶解动力学，对于大多数钠离子电极而言，实现快速充电和高功率密度是一个巨大的挑战。在这里，我们展示了一种基于超薄层状硫化锡（II）纳米结构的高容量高倍率钠离子阳极，其中通过动力学分析确定并验证了最大的外在拟电容贡献。石墨烯泡沫支撑的硫化锡（II）纳米阵列阳极在30 mA g（-1）时可提供约1,100 mAh g（-1）的高可逆容量，在30 A g（-1）时可提供约420 mAh g（-1）的高可逆容量。 ，甚至胜过其锂离子存储性能。