A Comparative Study of Layered Transition Metal Oxide Cathodes for Application in Sodium-Ion Battery
A Comparative Study of Layered Transition Metal Oxide Cathodes for Application in Sodium-Ion Battery
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DOI：
10.1021/am5080437
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发表时间：
2015-03-11
影响因子：
9.5
通讯作者：
Hassoun, Jusef
中科院分区：
文献类型：
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作者：
Hasa, Ivana;Buchholz, Daniel;Hassoun, Jusef
在此，我们报道了一项对通式为$NaxMO_2$（$M = Ni$，$Fe$，$Mn$）的P型层状钠过渡金属基氧化物的研究。我们通过共沉淀法合成材料，随后在空气中退火并用水冲洗，并且我们使用基于碳酸丙烯酯的电解质将这些电极作为钠离子电池的阴极进行检测。我们充分研究了镍铁比、退火温度和钠含量对电极电化学性能的影响。这些参数对材料结构和电化学性能的影响分别通过X射线衍射、扫描电子显微镜和循环伏安法得以揭示。这类P型材料对钠电池应用的适用性最终通过循环测试得以证明，该测试表明在放电容量（即约200 mAh g$^{-1}$）和充放电效率（接近100%）方面具有优异的电化学性能。
Herein, we report a study on P-type layered sodium transition metal-based oxides with a general formula of NaxMO2 (M = Ni, Fe, Mn). We synthesize the materials via coprecipitation followed by annealing in air and rinsing with water, and we examine the electrodes as cathodes for sodium-ion batteries using a propylene carbonate-based electrolyte. We fully investigate the effect of the Ni-to-Fe ratio, annealing temperature, and sodium content on the electrochemical performances of the electrodes. The impact of these parameters on the structural and electrochemical properties of the materials is revealed by X-ray diffraction, scanning electron microscopy, and cyclic voltammetry, respectively. The suitability of this class of P-type materials for sodium battery application is finally demonstrated by cycling tests revealing an excellent electrochemical performance in terms of delivered capacity (i.e., about 200 mAh g(-1) and charge-discharge efficiency (approaching 100%).