Stress and electrochromism induced by Li insertion in crystalline and amorphous V2O5 thin film electrodes

Scarmínio, Jair; Talledo, A.; Andersson, A.; Passerini, Stefano; Decker, F.

doi:10.1016/0013-4686(93)85053-2

Cited by 68 publications

(44 citation statements)

References 17 publications

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“…The dependence between the electrochromic effect and the Li x V 2 O 5 crystalline phases is cited in the literature 9 but, as far as we know, never relating the changes in the optical transmittance with the single and two-phase regions.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, significant differences were reported on the potential and on the optical transmittance of amorphous and crystalline vanadium oxide thin film electrodes, under lithium electrochemical intercalation. 9 In polycrystalline V 2 O 5 electrodes, Li intercalation induces the formation of Li x V 2 O 5 phases, whose structures are, at present, well known. 10 Recently we developed a thin film deposition process, the hot filament metal oxide deposition (HFMOD), 11 with which tungsten and molybdenum oxide film electrodes were produced, and their electrochromic properties for Li intercalation were studied.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes

Scarmínio¹,

Catarini²,

Urbano³

et al. 2008

J. Braz. Chem. Soc.

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Filmes amorfos de óxido de vanádio foram depositados sobre substratos de vidro recobertos com ITO, pela técnica de deposição de filmes de óxidos metálicos por filamento aquecido. Os espectros de difração de raios-X mostraram que os filmes como-depositados tratados termicamente em atmosfera de argônio em 200 e 300 o C continuaram amorfos e os tratados a 400 e 500 o C tornaram-se policristalinos, com a estrutura do V 2 O 5 . Os eletrodos foram eletroquimicamente reversíveis sob intercalação de Li + , exibindo o efeito eletrocrômico, observado por medidas da transmitância ótica em 632,8 nm. O coeficiente de difusão do Li, DC, foi medido pela técnica de titulação galvanostática intermitente (GITT) em função da carga inserida. Para os filmes cristalinos, a absorbância ótica e o DC aumentam com a quantidade de Li inserido, nas regiões de fase única de Li x V 2 O 5 cristalino e decrescem nas regiões de duas fases. Para essas, um DC efetivo foi considerado. Nos filmes cristalinos foi inferida a presença de outros óxidos de vanádio misturados à matriz de V 2 O 5 , através das medidas de cronopotenciometria e de DC.Amorphous vanadium oxide films were synthesized onto ITO-coated glass substrates by the hot filament metal oxide deposition technique. The as-deposited samples were heat-treated in an argon atmosphere. X-ray diffraction analysis revealed that the films treated at 200 and 300 o C were still amorphous, while those treated at 400 and 500 o C were crystalline, with a V 2 O 5 structure. All electrodes were electrochemically reversible for Li + intercalation, exhibiting the electrochromic effect, observed from optical transmittance measurements at 632.8 nm. The Li-diffusion coefficient, DC, was measured by the galvanostatic intermittent titration technique (GITT) as function of the inserted charge. For the crystalline films it was observed that the optical absorbance and the DC increase with increasing Li insertion in the single-phase regions of crystalline Li x V 2 O 5 and decrease in the two-phase regions. For the latter, an effective DC was considered. The presence of other vanadium oxides mixed to the V 2 O 5 matrix was inferred for the crystalline films from the chronopotentiometric and DC measurements. Keywords: vanadium oxide film, chronopotentiometric, DC measurements IntroductionThin films of vanadium oxides have been extensively studied as electrodes for lithium electrochemical insertion. Owing to the usually high charge intercalation capacity of these films, they are highly promising as cathodes for secondary microbatteries 1 and electrochromic devices. 2 The interest in these oxides lies on their performance as high Li intercalation capacity, high potential, high energy density, good cycling performance and on the unusual double electrochromic effect. The latter is the appearance of an anodic coloration in the near-ultraviolet region and a cathodic coloration in the near-infrared region as Li is intercalated. 3 Amorphous and crystalline vanadium oxide thin film electrodes have been prepared using chemical...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes

Scarmínio¹,

Catarini²,

Urbano³

et al. 2008

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…4(c)). A plausible explanation is that during the Li + insertion process there are changes in volume and lattice parameters, not to mention on the fact that mechanical stress occurs in the films, thus contributing to the electrochemical instability after consecutive cycles and leading to a decrease in the total voltammetric charge [27][28][29][30].…”

Section: Discussionmentioning

confidence: 98%

“…Furthermore, a decrease in the total charge is verified for this xerogel in acetonitrile after successive reduction/oxidation cycles. This decrease can be associated with the loss of peak definition, attributed to Li + insertion/deinsertion, which is probably due to the production of stable Li x V 2 O 5 crystalline phases, making the release of lithium ions to the supporting electrolyte solution more difficult [27,28]. Another explanation is related to water loss from the intercalated compound into the solvent during its reduction and subsequent oxidation in acetonitrile solution, which should lead to mechanical stress and a lower capacity fade [27][28][29][30].…”

Section: Discussionmentioning

confidence: 99%

Preparation of silica microspheres coated with V2O5 xerogel and V2O5/WO3 composite xerogel via adapted Stöber process

Barbosa¹,

Bolsoni²,

Oliveira³

2008

Journal of Non-Crystalline Solids

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“…In particular, significant differences are reported, being them related to the optical transmittance of amorphous and crystalline vanadium oxide thin film electrodes under lithium electrochemical intercalation, as a consequence of external perturbation (external potential). 11 Amorphous phase is characterized by a lamellar structure which directly dependents on the amount of water present and heat treatment to which such material is subjected. [12][13][14] The lamellar distance plays an important role in the intercalation/mobility of ions for charge compensation during the redox processes.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

Oliveira¹,

Oliveira²,

Alves³

et al. 2015

Revista Virtual De Química

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Resumo: Neste trabalho um novo procedimento de síntese do V 2 O 5 usando a combinação de dois métodos tradicionais, melt quenching e sonoquímica, chamado de melt sonoquenching foi proposto. O nanomaterial produzido foi caracterizado por vários métodos visando verificar características físicas e químicas, e sua possível aplicação como material eletrocrômico. Imagens de microscopia eletrônica de varredura mostraram nanofibras de óxido de vanádio com comprimentos variando de 140 a 160 nm, e diâmetros variando de 10 a 15 nm. Estudos de difração de raios X revelaram uma estrutura amorfas com espaçamento interlamelar de 13,3 Å. A composição foi estimada por TGA, sugerindo que a composição do óxido de vanádio xerogel foi de V 2 O 5 .1.8H 2 O. Em adição a isto, caracterizações espectroeletroquímicas mostraram uma variação de transmitância de 45 % em 410 nm, com uma persistência de coloração de 91,3 %; tempos de resposta para oxidação e redução foram de respectivamente 1 s e 3,5 s. e a eficiência eletrocrômica foi de 55 cm 2 C -1 ao longo de 100 ciclos de mudanças de coloração entre azul-verde-laranja. Palavras-chave:Eletrocromismo; eletrocrômico; V 2 O 5 ; fusão sonoresfriamento, melt sonoquenching. AbstractThis paper reports a new procedure for V 2 O 5 synthesis using the combination of two traditional methods, melt quenching and sonochemistry, called melt sonoquenching. The resulting nanomaterial was characterized by several methods in order to verify physical and chemical characteristics, and its possible use as electrochromic electrode material. Scanning electron micrographs revealed V 2 O 5 nanofibers with lengths varying from 140 to 160 nm, and diameters varying from 10 to 15 nm, X-ray diffraction experiments pointed to an amorphous structure with an interlamellar spacing of 13.3 Å. Chemical composition was estimated by TGA, suggesting that the composition for such xerogel oxide was V 2 O 5 .1.8H 2 O. Besides these, spectroelectrochemical characterization showed a transmittance variation of 45 % at 410 nm, with coloration persistence of 91.3 %, response times for the oxidation and reduction were, respectively, 1 s and 3.5 s, being such electrochomic efficiency of 55 cm 2 C -1 in throughout 100 cycles of color changes from blue-green-orange.

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Stress and electrochromism induced by Li insertion in crystalline and amorphous V2O5 thin film electrodes

Cited by 68 publications

References 17 publications

Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes

Li diffusion and electrochromism in amorphous and crystalline vanadium oxide thin film electrodes

Preparation of silica microspheres coated with V2O5 xerogel and V2O5/WO3 composite xerogel via adapted Stöber process

Electrochromic Behavior of Vanadium Oxide Nanostructures Synthesized by Melt Sonoquenching

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