ELECTRODE KINETICS STUDIES OF ELECTROSPUN Nb2O5 NANOSTRUCTURES
We have studied the electrode kinetics of electrospun Nb2O5 nanofibers and nanonuggets for lithium batteries. In brief, Nb2O5 nanofibers are prepared by electrospinning followed by sintering at temperatures range, 500-1100 °C for 1 h in air to obtain pseudo-hexagonal (H), orthorhombic (O), and monoclinic (M)Nb2O5 phases. The compounds are characterized by SEM, XRD, density and BET surface area techniques. Electrochemical properties are evaluated by galvanostatic technique at room temperature. The H-, O-and M-Nb2O5 polymorphs deliver discharge capacities (at second cycle) of 152, 189 and 242 (±5) mA h g-1, respectively. The lithium diffusion coefficients (DLi) are calculated using Galvanostatic Intermittent Titration Technique (GITT) and Electrochemical impedance spectroscopy (EIS) techniques at room temperature. The evaluated DLi values by GITT for H, O, and M-Nb2O5 phases are in the range 10-17-10-15, 10-15-10-13, and 10-13-10-11 cm2s-1 respectively, in the voltage range 1.0-2.6 V vs. Li/Li+. DLi evaluated by EIS give similar trend in the values but higher by one order of magnitude.
A. LE VIET M .V. REDDY R. JOSE B. V. R. CHOWDARI S. RAMAKRISHNA
Department of Physics, National University of Singapore, 117546, Singapore.Nanoscience and Nanotech Department of Physics,National University of Singapore, 117546, Singapore. Nanoscience and Nanotechnology Initiative, National University of Singapore, 117546, Singapore.
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
627-634
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）