Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.electacta.2013.10.003
Title: Studies on the lithium ion diffusion coefficients of electrospun Nb 2O5 nanostructures using galvanostatic intermittent titration and electrochemical impedance spectroscopy
Authors: Reddy, M.V. 
Jose, R.
Le Viet, A.
Ozoemena, K.I.
Chowdari, B.V.R. 
Ramakrishna, S.
Keywords: EIS
GITT
Li-diffusion coefficient
SEM
Issue Date: 10-May-2014
Citation: Reddy, M.V., Jose, R., Le Viet, A., Ozoemena, K.I., Chowdari, B.V.R., Ramakrishna, S. (2014-05-10). Studies on the lithium ion diffusion coefficients of electrospun Nb 2O5 nanostructures using galvanostatic intermittent titration and electrochemical impedance spectroscopy. Electrochimica Acta 128 : 198-202. ScholarBank@NUS Repository. https://doi.org/10.1016/j.electacta.2013.10.003
Abstract: We have studied the Li-diffusion coefficient values of electrospun Nb 2O5 nanofibers and nanonuggets for lithium batteries. In brief, Nb2O5 nanofibers were prepared by electrospinning followed by sintering at temperatures range 500-1100 °C for 1 h in air to obtain pseudo-hexagonal, orthorhombic (O), and monoclinic (M) Nb 2O5 phases. Electrochemical properties were evaluated by galvanostatic technique at room temperature. The H-, O- and M-Nb 2O5 polymorphs delivered 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 carried at room temperature. The evaluated DLi values by GITT for H-, O-, and M-Nb2O 5 phases are in the range 10-17-10-16, 10 -15-10-14, and 10-13-10-12 cm 2 s-1, respectively, in the voltage range 1.0-2.6 V vs. Li. DLi evaluated by EIS gave similar trend in the values but with a difference of one order higher magnitude. © 2013 Elsevier Ltd.
Source Title: Electrochimica Acta
URI: http://scholarbank.nus.edu.sg/handle/10635/98080
ISSN: 00134686
DOI: 10.1016/j.electacta.2013.10.003
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