Abstract
The structural and electrochemical effects of electrospun V2O5 with 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 V2O5 was further studied with computational modelling. Structural analysis suggested that the dopants had been incorporated into the V2O5 structure 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 V2O5 offered 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.

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Acknowledgements
The authors thank the A*STAR Research Attachment Program, Institute of Materials Research and Engineering (IMRE), Singapore. Thanks to Professor B V R Chowdari, National University of Singapore Department of Physics, for the use of his laboratories in processing these coin cells. Further thanks to Luxmi Devi Narain for graphical support. The authors acknowledge the use of the UCL Legion High Performance Computing Facility (Legion@UCL), and associated support services, in the completion of this work.
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Highlights
Dopants of varying oxidation states incorporated into electrospun V2O5 are studied.
Doping showed significant impacts on the crystallinity and V4+ concentration.
2 at% Na+ and 3 at% Ba2+ in V2O5 improved electrochemical performance.
Doping 3 at% Al3+ in V2O5 did not improve electrochemical performance.
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Armer, C.F., Lübke, M., Johnson, I. et al. Enhanced electrochemical performance of electrospun V2O5 fibres doped with redox-inactive metals. J Solid State Electrochem 22, 3703–3716 (2018). https://doi.org/10.1007/s10008-018-4055-3
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DOI: https://doi.org/10.1007/s10008-018-4055-3