Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Wang, Ying; Cao, Guozhong

doi:10.1016/j.electacta.2006.01.026

Cited by 70 publications

(42 citation statements)

References 33 publications

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“…Upon applying an anodic potential of 1.5 V, which induces lithium extraction, the colour of the lm turned back into yellow with an increase in absorption in the 400-500 nm range, similar as reported for V 2 O 5 lms. 11,14,15,26 Cycling stability of the V 2 O 5 -LC polymer hybrid lms was investigated under alternating potentials between À0.5 V and 1.5 V (sweep rate of 50 mV s À1 ) by observing the transmittance at 450 nm via time-resolved UV-visible spectroscopy. Aer equilibration of the system achieved aer few switching cycles, the composite structures showed distinct transitions between intercalated (reduced/bleached) state and deintercalated (oxidized/coloured) state with a change in transmittance of $25% at 450 nm and a good long-term cycle stability with a decrease of less than $20% over more than hundred switching cycles ( Fig.…”

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confidence: 99%

Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films

et al. 2015

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Bio-inspired V 2 O 5 -polymer hybrid films were prepared following a one-step self-organization procedure based on liquid crystal formation of organic and inorganic components. These materials were previously reported to exhibit advantageous mechanical properties, comparable to biomaterials, such as human bone and dentin. Here, we show that these hybrid films prepared via a fast and simple synthesis procedure have an additional function as an electrochromic material, exhibiting a long-term cycle stability under alternating potentials. The structures were found to remain intact without visible changes after more than hundred switching cycles and storing the devices for several weeks. Consequently, this multifunctional V 2 O 5 -polymer hybrid system shows great promise for various technical applications.Organic-inorganic biomaterials, such as bone and nacre, consist of high, stiff and brittle, mineral fractions, which are embedded in a so organic matrix.1,2 These materials exhibit a pronounced hierarchical structure and a controlled coupling at the interface between organic and inorganic components. These structural characteristics contribute to their outstanding mechanical properties, combining both high stiffness and toughness.3-6 Very recently, we developed a biomimetic fabrication concept for the synthesis of organic-inorganic composites based on liquid crystal (LC) formation of organic and inorganic components.7 The LC 'gluing' polymer used was a statistical polyoxazoline with pendant cholesteryl and carboxyl side chains, enabling the polymer, on the one hand, to form chiral-nematic lyotropic phases on the length scale of several hundreds of micrometers upon shearing, and on the other hand, to selectively bind to nanoparticle faces via electrostatic interactions or hydrogen bridges.7,8 The inorganic nanoparticles, Laponite 7 and vanadium pentoxide (V 2 O 5 ), 8 are anisotropic in shape and consequently, were also able to form LC phases. V 2 O 5 -LC polymer composites structured on six hierarchical levels exhibiting a well-dened nanostructure and a hierarchical structuring on the length scale of several hundreds of micrometers were fabricated via this one-step selforganization process.8 Long-range orientation of the polymeric lyotropic phase was induced by rotational shearing by means of a shear cell. Remarkably, these materials exhibit advantageous mechanical properties, comparable to mechanical properties of natural hierarchically structured organic-inorganic composites like human bone and dentin (data obtained by nanoindentation; a video visualizing the bending performance of the composite is available in the ESI †).8 In this study, we investigated these materials regarding their electrochromic performance, a second feature of this composite system, besides mechanical reinforcement.Electrochromism of thin lms of transition-metal oxides, such as tungsten oxide (WO 3 ) or V 2 O 5 , have been previously studied. Upon cation intercalation (reduction) of the metal oxide, a change in absorbance in the visib...

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Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films

et al. 2015

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“…[201] The fabrication of such nanostructures was accomplished using template-based growth by sol electrophoretic deposition [202][203][204][205][206][207][208] and electrochemical deposition. [209][210][211][212] Furthermore, platelet and fibrillar nanostructured V 2 O 5 films have been fabricated by solutionbased methods. [186] These platelet and fibrillar films consist of randomly oriented nanoscale V 2 O 5 particles or nanoscale fibers protruding from the substrate surface.…”

Section: Cathodes In Li-ion Batteriesmentioning

confidence: 99%

Oriented Nanostructures for Energy Conversion and Storage

et al. 2008

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Recently, the role of nanostructured materials in addressing the challenges in energy and natural resources has attracted wide attention. In particular, oriented nanostructures demonstrate promising properties for energy harvesting, conversion, and storage. In this Review, we highlight the synthesis and application of oriented nanostructures in a few key areas of energy technologies, namely photovoltaics, batteries, supercapacitors, and thermoelectrics. Although the applications differ from field to field, a common fundamental challenge is to improve the generation and transport of electrons and ions. We highlight the role of high surface area to maximize the surface activity and discuss the importance of optimum dimension and architecture, controlled pore channels, and alignment of the nanocrystalline phase to optimize the transport of electrons and ions. Finally, we discuss the challenges in attaining integrated architectures to achieve the desired performance. Brief background information is provided for the relevant technologies, but the emphasis is focused mainly on the nanoscale effects of mostly inorganic-based materials and devices.

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“…Nanostructured active materials provide a short lithium-ion insertion/extraction distance and a higher surface to volume ratio to contact with the electrolyte, which can conspicuously enlarge capacity and improve the stability during cycles [9,10]. There are reports about binder-and carbon-free V 2 O 5 film electrodes, which exhibited comparable electrochemical performance to the conventional electrodes [11,12].…”

Section: Introductionmentioning

confidence: 97%

“…For their highly recognized electrochemical potential and environmental friendliness, vanadium oxide thin films have been prepared on various substrates by a large variety of film growth techniques including sputtering [13], chemical vapor deposition [14], sol-gel method [15], electrophoretic deposition [12], etc. However, the aforementioned preparations depend on complex vanadium resource materials and complicated processing methods, which inevitably result in a high cost and long fabrication time.…”

Section: Introductionmentioning

confidence: 99%

Nanosheet-structured vanadium pentoxide thin film as a carbon- and binder-free cathode for lithium-ion battery applications

Zeng

Yang

2015

J Solid State Electrochem

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Vanadium pentoxide (V 2 O 5 ) nanosheet thin film without conductive additives and binders has been synthesized via sol-gel and liquid phase deposition methods on ITO glass substrate followed by heat treatment at 450°C. The SEM and TEM results showed that the as-deposited film presents an intertwined nanowire structure with a length of several micrometers and a width of dozens of nanometers, and it transformed into nanosheet-like crystalline orthorhombic V 2 O 5 after annealing. Possible formation process of the nanowired structure is briefly discussed. The analysis of XRD confirmed that the film exhibits a strong preferred orientation along c-axis. The Raman spectrum verified the layered structure of the film. The corresponding electrochemical performance tests indicated that the binder-and carbon-free film possesses comparable high specific capacity and good cyclic stability to the conventional electrodes, which manifests that this facile synthesized material is quite promising and it provides a low-cost alternative for lithium-ion battery applications.

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Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Cited by 70 publications

References 33 publications

Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films

Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films

Oriented Nanostructures for Energy Conversion and Storage

Nanosheet-structured vanadium pentoxide thin film as a carbon- and binder-free cathode for lithium-ion battery applications

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Li+-intercalation electrochemical/electrochromic properties of vanadium pentoxide films by sol electrophoretic deposition

Cited by 70 publications

References 33 publications

Electrochromic properties of self-organized multifunctional V2O5–polymer hybrid films

Electrochromic properties of self-organized multifunctional V2O5–polymer hybrid films

Oriented Nanostructures for Energy Conversion and Storage

Nanosheet-structured vanadium pentoxide thin film as a carbon- and binder-free cathode for lithium-ion battery applications

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Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films

Electrochromic properties of self-organized multifunctional V₂O₅–polymer hybrid films