Rajan, Jose and Reddy, M. Venkatashamy and Le Viet, Anh and Ozoemenad, Kenneth I and Chowdary, B. V. R and Ramakrishna, S. (2014) Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy. Electrochimica Acta, 128. pp. 198-202. ISSN 0013-4686. (Published)
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Abstract
We have studied the Li-diffusion coefficient values of electrospun Nb2O5 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) Nb2O5 phases. Electrochemical properties were evaluated by galvanostatic technique at room temperature. The H-, O- and M-Nb2O5 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-Nb2O5 phases are in the range 10−17–10−16, 10−15–10−14, and 10−13–10−12 cm2 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.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Prof. Dr. Jose Rajan |
| Date Deposited: | 04 Aug 2014 02:02 |
| Last Modified: | 19 Feb 2018 07:37 |
| URI: | http://umpir.ump.edu.my/id/eprint/6248 |
| Download Statistic: | View Download Statistics |
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