Hydro thermal synthesis and electrochemical characterization of (V1/2Sb1/2Sn)O4 and (Fe1/2Sb1/2Sn)O4 as energy storage materials

M. A. Kumar, Hendry. I. Elim, M. Idris, A. H. Yuwono, B. Yuliarto, P. D. Rompas, Azeez Abdullah Barzinjy, F. Hamed, R. Jose, Zaghib Karim, M. V. Reddy
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引用次数: 2

Abstract

This paper reports the hydrothermal synthesis of alloy anode materials (V1/2Sb1/2Sn)O4 and (Fe1/2Sb1/2Sn)O4 and determine the effect of heat treatment on reversible capacities of the two oxides, and evaluation of their electrochemical properties. The compounds were initially prepared using the hydrothermal method at 180°C, and part of the active materials were reheated at 500°C in the air to improve the crystallinity and reduce the impurities. The materials were characterized by X-ray diffraction, scanning electron microscopy (SEM), Raman spectroscopy, and BET surface area. Anodic electrochemical behavior was examined by cyclic voltammetry (CV), galvanostatic cycling, and electrochemical impedance spectroscopy (EIS). Results show that (Fe1/2Sb1/2Sn)O4 reheated at 500°C delivers a better capacity of ∼400 mAh/g at 0.005-1.0 V voltage range up to 60th cycle. When we cycled a higher cut-off voltage of 0.005-3.0V, higher reversible capacity and higher capacity fading were noted due to alloying and conversion reaction of these mixed oxides. Cyclic voltammetry studies show reversible alloying/de-alloying peaks at ∼0.25 and ∼0.5 V vs. Li
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(V1/2Sb1/2Sn)O4和(Fe1/2Sb1/2Sn)O4储能材料的水热合成及电化学表征
本文报道了水热合成合金阳极材料(V1/2Sb1/2Sn)O4和(Fe1/2Sb1/2Sn)O4,并测定了热处理对两种氧化物可逆性能的影响,并评价了它们的电化学性能。在180℃条件下采用水热法初步制备化合物,部分活性物质在500℃空气中再加热,以提高结晶度,减少杂质。采用x射线衍射、扫描电镜(SEM)、拉曼光谱(Raman spectroscopy)和BET表面积对材料进行了表征。采用循环伏安法(CV)、恒流循环法和电化学阻抗谱法(EIS)检测阳极电化学行为。结果表明,(Fe1/2Sb1/2Sn)O4在500°C下再加热,在0.005-1.0 V电压范围内可提供约400 mAh/g的更好容量,直至60次循环。当我们在0.005-3.0V的高截止电压下循环时,由于混合氧化物的合金化和转化反应,可逆容量增大,容量衰退加剧。循环伏安法研究表明,与Li相比,在~ 0.25 V和~ 0.5 V处出现可逆的合金化/去合金化峰
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