Armer, CF;
Lübke, M;
Johnson, I;
McColl, K;
Cora, F;
Yeoh, JS;
Reddy, MV;
... Lowe, A; + view all
(2018)
Enhanced Electrochemical Performance of Electrospun V2O5 Fibres Doped With Redox-inactive Metals.
Journal of Solid State Electrochemistry
, 22
(12)
pp. 3703-3716.
10.1007/s10008-018-4055-3.
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Abstract
The structural and electrochemical effects of electrospun V2O5with selected redox-inactive dopants (namely Na+, Ba2+and Al3+) have been studied. The electrospun materials have been characterised via a range of analytical methods including X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area measurements and scanning and transmission electron microscopy. The incorporation of dopants in V2O5was further studied with computational modelling. Structural analysis suggested that the dopants had been incorporated into the V2O5structure with changes in crystal orientation and particle size, and variations in the V4+concentration. Electrochemical investigations using potentiodynamic, galvanostatic and impedance spectroscopy analysis showed that electrochemical performance might be dependent on V4+concentration, which influenced electronic conductivity. Na+- or Ba2+-doped V2O5offered improved conductivities and lithium ion diffusion properties, whilst Al3+doping was shown to be detrimental to these properties. The energetics of dopant incorporation, calculated using atomistic simulations, indicated that Na+and Ba2+occupy interstitial positions in the interlayer space, whilst Al3+is incorporated in V sites and replaces a vanadyl-like (VO)3+group. Overall, the mode of incorporation of the dopants affects the concentration of oxygen vacancies and V4+ions in the compounds, and in turn their electrochemical performance. [Figure not available: see fulltext.].
| Type: | Article |
|---|---|
| Title: | Enhanced Electrochemical Performance of Electrospun V2O5 Fibres Doped With Redox-inactive Metals |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s10008-018-4055-3 |
| Publisher version: | https://doi.org/10.1007/s10008-018-4055-3 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Lithium ion battery, Positive electrode, Electrospinning, V2O5, Doping |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10060587 |
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