화학공학소재연구정보센터
Electrochimica Acta, Vol.56, No.22, 7437-7441, 2011
Synthesis and electrochemical performance of bismuth-vanadium oxyfluoride
Bismuth-vanadium oxyfluoride (Bi2VO5F) has been synthesized using a simple, solid-state reaction process at different sintering temperatures. The structure and performance of the samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge experiments. The results show that bismuth-vanadium oxyfluoride belongs to a tetragonal crystal system with space group 14mm. The sample that was synthesized at 550 degrees C (P550) exhibits relatively good electrochemical properties. Sample P550 shows a high, initial discharge capacity of 222 mAh g(-1) at a rate of 100 mA g(-1) between 1.4 and 3.5 V. Sample P550 also shows acceptable electrochemical cycling properties. After the first cycle, the discharge specific capacity remains between 106 and 155 mAh g(-1), which plateaus between 2.1 and 1.9 V during the first 15 cycles. (C) 2011 Elsevier Ltd. All rights reserved.