钠离子电池正极材料Na0.7Co1-xNbxO2(x = 0,0.05)的电化学分析

J. Pati, M. Chandra, R. Dhaka
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引用次数: 1

摘要

钠离子电池(SIBs)由于钠的大量可用性和低成本而成为储能应用的有前途的替代方案,受到了极大的关注。本文研究了固相反应合成的Na$_{0.74}$Co$_{1-x}$Nb$_x$O$_2$ ($x= 0和0.05样品)的电化学行为。x射线衍射图的Rietveld细化揭示了具有P63/mmc空间群的六方晶体对称性。Na$ {0.74}$Co$ {0.95}$Nb$ {0.05}$O$_2$阴极在电流密度为6 mAg$^{-1}$时的比容量约为91 mAhg$^{-1}$,而Na$ {0.74}$CoO$_2$的比容量相对较低(在电流密度为6 mAg$^{-1}$时的比容量为70 mAhg$^{-1}$)。用循环伏安法(CV)和电子阻抗谱法(EIS)测定了Na的扩散系数,其范围为10$^{-10}$ cm$^2$ 5 $^{-1}$。
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Electrochemical analysis of Na0.7Co1-xNbxO2(x = 0, 0.05) as cathode materials in sodium-ion batteries
Sodium-ion batteries (SIBs) have received significant attention as promising alternative for energy storage applications owing to the large availability and low cost of sodium. In this paper we study the electrochemical behavior of Na$_{0.74}$Co$_{1-x}$Nb$_x$O$_2$ ($x=$ 0 and 0.05 samples), synthesized via solid-state reaction. The Rietveld refinement of x-ray diffraction patterns reveals the hexagonal crystal symmetry with P63/mmc space group. The Na$_{0.74}$Co$_{0.95}$Nb$_{0.05}$O$_2$ cathode exhibits a specific capacity of about 91 mAhg$^{-1}$ at a current density of 6 mAg$^{-1}$, whereas Na$_{0.74}$CoO$_2$ exhibits comparatively low specific capacity (70 mAhg$^{-1}$ at a current density of 6 mAg$^{-1}$). The cyclic voltammetry (CV) and electron impedance spectroscopy (EIS) were performed to determine the diffusion coefficient of Na, which found to be in the range of 10$^{-10}$ cm$^2$s$^{-1}$.
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