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Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy

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),...

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Main Authors: Rajan, Jose, Reddy, M. Venkatashamy, Le Viet, Anh, Ozoemenad, Kenneth I, Chowdary, B. V. R, Ramakrishna, S.
Format: Article
Language:English
Published: Elsevier 2014
Subjects:
QD Chemistry
Online Access:http://umpir.ump.edu.my/id/eprint/6248/1/fist-2014-rjose-Nb2O5Lidiffusion_abs_only.pdf
http://umpir.ump.edu.my/id/eprint/6248/
http://dx.doi.org/10.1016/j.electacta.2013.10.003
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spelling my.ump.umpir.62482018-02-19T07:37:46Z http://umpir.ump.edu.my/id/eprint/6248/ Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy Rajan, Jose Reddy, M. Venkatashamy Le Viet, Anh Ozoemenad, Kenneth I Chowdary, B. V. R Ramakrishna, S. QD Chemistry 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. Elsevier 2014 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/6248/1/fist-2014-rjose-Nb2O5Lidiffusion_abs_only.pdf 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 http://dx.doi.org/10.1016/j.electacta.2013.10.003 DOI: 10.1016/j.electacta.2013.10.003
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Rajan, Jose
Reddy, M. Venkatashamy
Le Viet, Anh
Ozoemenad, Kenneth I
Chowdary, B. V. R
Ramakrishna, S.
Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
description 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.
format Article
author Rajan, Jose
Reddy, M. Venkatashamy
Le Viet, Anh
Ozoemenad, Kenneth I
Chowdary, B. V. R
Ramakrishna, S.
author_facet Rajan, Jose
Reddy, M. Venkatashamy
Le Viet, Anh
Ozoemenad, Kenneth I
Chowdary, B. V. R
Ramakrishna, S.
author_sort Rajan, Jose
title Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
title_short Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
title_full Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
title_fullStr Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
title_full_unstemmed Studies on the Lithium Ion Diffusion Coefficients of Electrospun Nb2O5 Nanostructures Using Galvanostatic Intermittent Titration and Electrochemical Impedance Spectroscopy
title_sort studies on the lithium ion diffusion coefficients of electrospun nb2o5 nanostructures using galvanostatic intermittent titration and electrochemical impedance spectroscopy
publisher Elsevier
publishDate 2014
url http://umpir.ump.edu.my/id/eprint/6248/1/fist-2014-rjose-Nb2O5Lidiffusion_abs_only.pdf
http://umpir.ump.edu.my/id/eprint/6248/
http://dx.doi.org/10.1016/j.electacta.2013.10.003
_version_ 1643665335045324800
score 13.211869

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