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引用次数: 0
摘要
铌基磷酸盐具有高稳定性和环保等优点，在钠离子电池中具有良好的应用前景。本研究采用不同方法成功合成了纯相Na(NbO2)2PO4（NNP）粉末，并通过XRD、XPS、SEM和电化学方法对材料进行了表征。在 100 mA g-1 的电流密度下，NNP 在第一个循环中的放电比容量为 521.8 mAh g-1，200 个循环后仍保持在 462.4 mAh g-1 的水平，表明其具有良好的循环稳定性。循环伏安法（CV）得出的动力学结果显示，伪电容贡献占容量的很大比例。NNP 的电荷转移电阻为 260.3 Ω，明显小于电化学阻抗谱（EIS）得出的其他电阻。这表明了 NNP 作为 SIB 负极材料的优势。
NASICON-Na(NbO2)2PO4 anode material with high capacity and good stability for sodium-ion batteries
Niobium-based phosphates have the advantages of high stability and environmental protection and have good application prospects in sodium-ion batteries. The pure phase of Na(NbO2)2PO4 (NNP) powder was successfully synthesized by different methods in this work, and the materials were characterized via XRD, XPS, SEM, and electrochemical methods. At the current density of 100 mA g−1, the discharge-specific capacity of NNP is 521.8 mAh g−1 in the first cycle and remains at 462.4 mAh g−1 after 200 cycles, indicating that it has good cycling stability. The kinetic results obtained from cyclic voltammetry (CV) show the pseudo-capacitance contribution accounts for a large percentage of the capacity. The charge transfer resistance of NNP is 260.3 Ω, which is significantly smaller than the others derived from electrochemical impedance spectroscopy (EIS). These pointed to the advantages of NNP in anode material for SIBs.
期刊介绍：
Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.
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