A novel hierarchical electrode material for Na-ion batteries composed of Sb nanoplates on Ni nanorod arrays is developed to tackle the issues of the rapid capacity fading and poor rate capability of Sb-based materials. The three-dimensional (3D) Sb-Ni nanoarrays as anodes exhibit the synergistic effects of the two-dimensional nanoplates and the open and conductive array structure as well as strong structural integrity. Further, their capacitive behavior is confirmed through a kinetics analysis, which shows that their excellent Na-storage performance is attributable to their unique nanostructure. When used as binder-free sodium-ion battery (SIB) anodes, the nanoarrays exhibit a high capacity retention rate (more than 80% over 200 cycles) at a current density of 0.5 A·g^–1 and excellent rate capacity (up to 20 A·g^–1), with their capacity being 580 mAh·g^–1. Moreover, a P2-Na_2/3Ni_1/3Mn_2/3O₂//3D Sb-Ni nanoarrays full cell delivers a highly reversible capacity of 579.8 mAh·g^–1 over 200 cycles and an energy density as high as 100 Wh·kg^–1. This design strategy for ensuring fast and stable Na storage may work with other electrode materials as well.

中文翻译：

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分层的Sb-Ni纳米阵列作为耐用的无粘合剂阳极，适用于高性能钠离子半电池和全电池

为了解决基于Sb的材料的快速容量衰减和差的倍率性能的问题，开发了一种用于Ni离子纳米棒阵列上的由Sb纳米板组成的Na离子电池的新型分层电极材料。三维（3D）Sb-Ni纳米阵列作为阳极表现出二维纳米板与开放和导电阵列结构以及强大的结构完整性的协同效应。此外，通过动力学分析证实了它们的电容性能，这表明它们出色的Na储存性能归因于其独特的纳米结构。当用作无粘合剂钠离子电池（SIB）阳极时，纳米阵列在0.5 A·g ^–1的电流密度下显示出高容量保持率（200个循环中超过80％）。以及出色的额定容量（高达20 A·g ^–1），容量为580 mAh·g ^–1。此外，P2-Na _2/3 Ni _1/3 Mn _2/3 O ₂ // 3D Sb-Ni纳米阵列全电池在200个循环中可提供579.8 mAh·g ^–1的高度可逆容量，能量密度高达100 Wh·kg ^–1。这种确保快速和稳定的Na储存的设计策略也可以与其他电极材料一起使用。