Morphology, structure and electrochemical properties of single phase electrospun vanadium pentoxide nanofibers for lithium ion batteries

Cheah, Yan Ling; Gupta, Neha; Pramana, Stevin S.; Aravindan, Vanchiappan; Wee, Grace; Srinivasan, Madhavi

doi:10.1016/j.jpowsour.2011.03.039

Cited by 158 publications

(151 citation statements)

References 32 publications

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“…From the data, it is clear that the introduction of a small amount (that is, 2%) of graphene has a profound effect on the electrochemical performance of V 2 O 5 , and the V 2 O 5 -G shows the best electrochemical performance of any reported V 2 O 5 hybrids in the coin cell configuration, as summarized in Supplementary Table 2 (refs 5,7,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. However, all performance changes are rooted in the material structure.…”

Section: Resultsmentioning

confidence: 99%

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

et al. 2015

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The long-standing issues of low intrinsic electronic conductivity, slow lithium-ion diffusion and irreversible phase transitions on deep discharge prevent the high specific capacity/energy (443 mAh g À 1 and 1,550 Wh kg À 1 ) vanadium pentoxide from being used as the cathode material in practical battery applications. Here we develop a method to incorporate graphene sheets into vanadium pentoxide nanoribbons via the sol-gel process. The resulting graphene-modified nanostructured vanadium pentoxide hybrids contain only 2 wt. % graphene, yet exhibits extraordinary electrochemical performance: a specific capacity of 438 mAh g À 1 , approaching the theoretical value (443 mAh g À 1 ), a long cyclability and significantly enhanced rate capability. Such performance is the result of the combined effects of the graphene on structural stability, electronic conduction, vanadium redox reaction and lithium-ion diffusion supported by various experimental studies. This method provides a new avenue to create nanostructured metal oxide/graphene materials for advanced battery applications.

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Section: Resultsmentioning

confidence: 99%

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

et al. 2015

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“…Electrospinning has also been employed recently in the synthesis of 1D V2O5 nanowires which display enhanced Li-ion performance [326,328,329,332]. For example, Mai et al [329], prepared ultra-long V2O5 nanowires with diameters between 100-200 nm and lengths of several millimetres, by electrospinning a solution of poly (vinyl alcohol) and NH4VO3 under an applied voltage of 20 kV.…”

Section: 14mentioning

confidence: 99%

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

et al. 2013

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Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin ABSTRACTThe performance of the lithium-ion cell is heavily dependent on the ability of the host electrodes to accommodate and release Li + ions from the local structure. While the choice of electrode materials may define parameters such as cell potential and capacity, the process of intercalation may be physically limited by the rate of solid-state Li + diffusion. Increased diffusion rates in lithium-ion electrodes may be achieved through a reduction in the diffusion path, accomplished by a scaling of the respective electrode dimensions.In addition, some electrodes may undergo large volume changes associated with charging and discharging, the strain of which, may be better accommodated through nanostructuring. Failure of the host to accommodate such volume changes may lead to pulverisation of the local structure and a rapid loss of capacity. In this review article, we seek to highlight a number of significant gains in the development of nanostructured lithium-ion battery architectures (both anode and cathode), as drivers of potential next-generation electrochemical energy storage devices.

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“…The elongation of the charged droplet expelled from the tip of the needle is caused by electrostatic repulsions experienced in the bends of the lengthening droplet into a fiber which creates the nanometre-scale diameters [49]. The surface morphology and diameter of the fibres can be controlled by varying parameters such as applied potential, feed rate of the sol gel solution and sol gel components [50]. Doping is easily achieved in electrospinning as the dopant precursor can be added into the electrospinning solution resulting in a homogenously distributed dopant [35,39,51].…”

Section: Introductionmentioning

confidence: 99%

Phase change effect on the structural and electrochemical behaviour of pure and doped vanadium pentoxide as positive electrodes for lithium ion batteries

Armer

Lübke

Reddy

et al. 2017

Journal of Power Sources

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Electrospun ceramic oxide fibers find myriad uses as energy materials such as in battery electrodes and vanadium oxides are one such family of materials. In this study, the structural and energy storage properties of electrospun vanadium pentoxide are compared to approximately 10 at% barium and titanium-doped equivalents. The vanadium pentoxide was doped in order to improve its electrochemical performance. The materials are characterised using powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller measurements, transmission electron microscopy and potentiostatic and galvanostatic analysis. X-ray diffraction analysis showed that each dopant has a critical effect on lattice distortions whilst showing no influence over the overall crystal structure, which is unusual for such large dopant amounts. The doped materials show better cyclability and higher efficiencies than the pure equivalent. Ex-situ X-ray diffraction measurements show detrimental phase changes within undoped V2O5 whereas the titanium-doped V2O5 predominantly remains as α-V2O5 after the first cycle.

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Morphology, structure and electrochemical properties of single phase electrospun vanadium pentoxide nanofibers for lithium ion batteries

Cited by 158 publications

References 32 publications

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

Graphene-modified nanostructured vanadium pentoxide hybrids with extraordinary electrochemical performance for Li-ion batteries

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

Phase change effect on the structural and electrochemical behaviour of pure and doped vanadium pentoxide as positive electrodes for lithium ion batteries

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