Reduced Surfactant Uptake in Three Dimensional Assemblies of VOx Nanotubes Improves Reversible Li+ Intercalation and Charge Capacity

O’Dwyer, Colm; Lavayen, Vladimir; Tanner, David A.; Newcomb, S. B.; Benavente, E.; González, Guillermo; Torres, C. M. Sotomayor

doi:10.1002/adfm.200801107

Cited by 82 publications

(78 citation statements)

References 54 publications

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“…By forming nanourchin morphologies (Fig. 29), O'Dwyer et al [359] demonstrated that the reduced amine uptake during synthetic functionalisation when making nanotubes in radial arrays such as nanourchin forms, frees up the V2O5 (010) surface within the high surface area material, allowing improved density and rate for Li ion insertion. High-resolution TEM studies revealed the unique observation of nanometer-scale nanocrystals of pristine unreacted V2O5 throughout the length of the nanotubes in the nanourchin.…”

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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Section: 14mentioning

confidence: 99%

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

et al. 2013

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“…67 When coupled with the nano-scale dimensions of the VONTs which facilitate shorter diffusion lengths for Li ions to the scrolled V 2 O 5 crystal making up the VONT, the reversibility of the insertion-removal redox process can potentially be improved compared to bulk materials, provided that intercalation sites for cations are not blocked by organic templates. 68,69 In this work we show how high quality vanadium oxide nanotubes (VONTs) produced using an optimized synthetic protocol with aminebased structural templates, can be transformed into polycrystalline nanorods (poly-NRs) of V 2 O 5 during annealing. We detail this process by monitoring both the inorganic and organic phase change and decomposition, respectively using IR spectroscopy, electron microscopy and X-ray diffraction analyzes.…”

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confidence: 99%

Polycrystalline Vanadium Oxide Nanorods: Growth, Structure and Improved Electrochemical Response as a Li-Ion Battery Cathode Material

McNulty

Buckley

O’Dwyer

2014

J. Electrochem. Soc.

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Thermally removing amine molecules that serve as chemical templates for vanadium oxide nanotubes is demonstrated to significantly improve the performance when tested as a cathode material in Li-ion battery cells. Capacity fading issues associated with blocked intercalation sites on the (010) faces of layered vanadium oxide that form the nanotubes are prevented. Thermal treatment of the nanotubes up to 600 • C is shown to cause a specific conversion from nanotubes to polycrystalline nanorods and removal of the organic template. The conversion process was monitored by thermogravimetric analysis, X-ray diffraction, transmission electron microscopy and infra-red spectroscopy. In a potential window of 4.0-1.2 V drawing 30 μA (C/30), the nanorods show improved specific capacities of ∼280 mAh g −1 with a modest 6% capacity fade compared to ∼8 mAh g −1 with 62% capacity fade for the VONTs. The improvements in specific capacity and cycling performance are due to the successful removal of amine molecules and conversion to nanorods containing nanoscale crystals. The cathode material also demonstrated enhanced energy densities (∼700 W h kg −1 ) compared to composites of the same overall weight, without conductive carbon additives or polymeric binders. In recent years there has been a significant increase in the desire and need to improve the performance and cycle life of commercial rechargeable lithium ion batteries.1-6 The advent of smart phones and tablet devices has highlighted the limitations of current generation lithium ion batteries. Rechargeable lithium ion batteries still hold great promise for use in powering electric and hybrid electric vehicles and continue to be crucial in medical and handheld portable devices. 7However it is vital that factors such as power and energy density, coulometric efficiency and rate performance are improved upon in order to meet demands for improved performance in advanced Liion batteries (∼400 Wh/kg). 1,4,[7][8][9] It is no surprise that nanostructured materials are attracting significant attention because of their novel properties and their potential applications in a wide range of devices such as biological and gas sensors, 10-18 field effect transistors 19,20 and as electrode materials for next generation high energy density batteries. 21-23 Nanostructured cathode electrodes offer improved energy storage capacity and charge-discharge kinetics, as well as better cyclic stabilities.24 This is, in part, due to the increased surface area in direct contact with the electrolyte, and better electronic and ionic conductivity, and shorter distances for cation diffusion as compared with bulk materials. 25 Nanostructured electrodes are also able to better accommodate volume changes associated with cyclic intercalation and deintercalation of lithium ions into and from the host lattice. This reduces pulverization issues associated with bulk materials and consequently improves cycle life. 62 Nanostructures such as vanadium oxide nanotubes (VONTs) and nanorods are particularly attractive in prin...

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“…The layered geometry of orthorhombic crystalline V 2 O 5 makes it ideally suited to the reversible intercalation of mobile guest species, 21,22 such as Li + and other cations. [23][24][25][26] While the lattice structure is theoretically maintained upon mild intercalation, phase changes are known to occur and the interlayer van der Waals spacing characteristic of its layered orthorhombic crystal structure can become deformed at lower voltages (higher Li mole fraction). 27,28 Large particle sizes can also limit the solid state diffusional rate of cation insertion.…”

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3D Vanadium Oxide Inverse Opal Growth by Electrodeposition

Armstrong

O’Sullivan

O’Connell

et al. 2015

J. Electrochem. Soc.

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Three-dimensional vanadium pentoxide (V 2 O 5 ) material architectures in the form of inverse opals (IOs) were fabricated using a simple electrodeposition process into artificial opal templates on stainless steel foil using an aqueous solution of VOSO 4 .χH 2 O with added ethanol. The direct deposition of V 2 O 5 IOs was compared with V 2 O 5 planar electrodeposition and confirms a similar progressive nucleation and growth mechanism. An in-depth examination of the chemical and morphological nature of the IO material was performed using X-ray crystallography, X-ray photoelectron spectroscopy, Raman scattering and scanning/transmission electron microscopy. Electrodeposition is demonstrated to be a function of the interstitial void fraction of the artificial opal and ionic diffusivity that leads to high quality, phase pure V 2 O 5 inverse opals is not adversely affected by diffusion pathway tortuosity. Methods to alleviate electrodeposited overlayer formation on the artificial opal templates for the fabrication of the porous 3D structures are also demonstrated. Such a 3D material is ideally suited as a cathode for lithium ion batteries, electrochromic devices, sensors and for applications requiring high surface area electrochemically active metal oxides. The growth in portable electronics and the need for cleaner energy solutions has led to the rising interest in materials research and energy storage material architectures that may help drive advancement in energy storage technologies to mitigate current issues in some energy storage materials and batteries such as capacity fading and lower life times, for example. [1][2][3][4] In recent years, three-dimensional (3D) material architectures 5 have become a particularly attractive approach to achieving significant improvements in charge rate performance, maintenance of specific capacity and opportunities for higher power density supercapacitors. [6][7][8][9] For this reason, the development of synthesis routes for the fabrication of three-dimensional nanostructured active materials onto metallic current collector substrates is important. [10][11][12][13] Electrodeposition is a particularly facile route for the formation of metal and metal oxide films on a variety of conductive substrates and has recently gained a lot of attention for synthesising three-dimensional materials when combined with templates and sacrificial architecture-directing structures. [14][15][16][17] Vanadium pentoxide is a particularly attractive replacement cathode material with its mixed valence, V 4+ and V 5+ , making it an ideal candidate for a large number of redox-dependent applications. 23-26 While the lattice structure is theoretically maintained upon mild intercalation, phase changes are known to occur and the interlayer van der Waals spacing characteristic of its layered orthorhombic crystal structure can become deformed at lower voltages (higher Li mole fraction). 27,28 Large particle sizes can also limit the solid state diffusional rate of cation insertion. The growth of a porous, thre...

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Reduced Surfactant Uptake in Three Dimensional Assemblies of VO_x Nanotubes Improves Reversible Li⁺ Intercalation and Charge Capacity

Cited by 82 publications

References 54 publications

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

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

Polycrystalline Vanadium Oxide Nanorods: Growth, Structure and Improved Electrochemical Response as a Li-Ion Battery Cathode Material

3D Vanadium Oxide Inverse Opal Growth by Electrodeposition

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