In situ Raman microspectrometry investigation of electrochemical lithium intercalation into sputtered crystalline V2O5 thin films

Baddour‐Hadjean, R.; Navone, Christelle; Pereira-Ramos, J.P.

doi:10.1016/j.electacta.2009.06.052

Cited by 59 publications

(68 citation statements)

References 52 publications

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“…The ε phase was first reported in Refs [13,17,36], and spectroscopically identified for chemically lithiated powders [26] and electrochemically formed thin-film electrodes. [28,34] In the whole lithium composition domain corresponding to the ε/ε phase, lithium sites are elongated cubooctahedra joining the common faces, [36] the symmetry of such sites remaining unchanged with x. However, for lithium amounts <0.5, the number of unoccupied cubo-octahedra exceeds the number of occupied cubo-octahedra, whereas above x = 0.5, neighbouring cubo-octahedra are occupied.…”

Section: Resultsmentioning

confidence: 99%

“…It has been recently and successfully applied to follow the structural changes occurring in a Li x V 2 O 5 thinfilm electrode. [28,32,34] In this paper, a detailed description of the structural modifications induced in a Li x V 2 O 5 composite cathode during lithium electrochemical intercalation in the 4-2.15 V potential range is provided for the first time.…”

Section: Introductionmentioning

confidence: 99%

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Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Baddour‐Hadjean

Marzouk

Pereira-Ramos

2011

J Raman Spectroscopy

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The structural behaviour of the Li x V 2 O 5 active material in a composite electrode is determined upon lithium insertion/extraction in the 4-2.15 V potential range (0 ≤ x < 2) using Raman microspectrometry. For the first time, a detailed description of phase transitions occurring in the V 2 O 5 composite electrode is provided by Raman spectroscopy, on the basis of a complete assignment of the spectra. This approach has been successful because of the knowledge of the Raman fingerprints of the chemically lithiated compounds, combined with a rigorous and systematic deconvolution of the Raman spectra obtained for the electrochemically lithiated materials. The successive emergence of α, ε, δ and γ phases is clearly established, as well as the α/ε, ε/δ and δ/γ biphasic regions corresponding to the 3.4, 3.2 and 2.3 V potential plateaus, respectively. This study shows that Raman spectroscopy constitutes a sensitive and relevant tool to explore the emergence of the various phases governing the electrochemical properties of cathode materials for lithium batteries.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Baddour‐Hadjean

Marzouk

Pereira-Ramos

2011

J Raman Spectroscopy

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100

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“…To avoid the possible reactions between sample and air, various in situ devices were designed to study the structure changes and interface evolutions during electrochemical cycles [10][11][12][13][14][15][16][17][18]. Baehtz et al [10][11][12] designed the in situ cell for XRD to observe the structure evolutions of LiMn 2 O 4 , NaCoO 2 , and LiFeSO 4 F during ion insertion/extraction reactions.…”

Section: Introductionmentioning

confidence: 99%

Design and comparison of ex situ and in situ devices for Raman characterization of lithium titanate anode material

Shu

Shui

et al. 2011

Ionics

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In this paper, ex situ and in situ devices for Raman observations are designed and compared with each other by using lithium titanate as working electrode. In situ cell is made for Raman spectroscopy based on a confocal microscope Raman spectrometer. The instant evolutions of lithium titanate anode material during cycle can be recorded by in situ Raman in detail. Although the in situ technique is an important method to monitor the structure evolution of lithium titanate, it is difficult to conduct an in situ experiment in most laboratories. Moreover, the existence of electrolyte and surface deposits weakens the Raman signals of sample. Therefore, the structure evolution of Li 4 Ti 5 O 12 cannot be described accurately. For comparison, air-free ex situ device is a simple and cheap tool to achieve the information from lithiated and delithiated samples. By removing the electrolyte and deposits on the sample with dimethyl carbonate, the ex situ Raman pattern shows higher signal to noise ratio than that of in situ Raman result. As a result, the shift and recovery of ex situ Raman bands confirms that the electrochemical reaction of Li 4 Ti 5 O 12 with Li in 0.0-2.0 V is not a fully reversible process but a partially reversible process.

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“…Among the other chromogenic materials, vanadium pentoxide (V 2 O 5 ) in thin-film configuration is one of the TMOs, which has been receiving much attention owing to its quite motivating structural, chemical and chromogenic properties and exceptional industrial applications such as electrochromic devices and optical memory devices [7][8][9]. Most of the researchers have prepared thin films of V 2 O 5 on various solid substrates by different thin-film deposition techniques and investigated their microstructural, optical, electrochromic and electrochemical properties in detail [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and electrochromic properties of activated reactive evaporated nano-crystalline V2O5 thin films grown on flexible substrates

2013

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Vanadium pentoxide (V 2 O 5 ) thin films were grown on indium tin oxide-coated flexible Kapton substrates by homebuilt activated reactive evaporation technique. Film depositions were carried out at optimised oxygen partial pressure of 1 × 10 −3 Torr and plasma power of 8 W, and we investigated their microstructural and optoelectrochromic properties as a function of substrate temperature. The V 2 O 5 films grown at T s = 473 K exhibited a nano-crystalline nature as evidenced from X-ray diffraction, atomic force microscopy and Raman studies. The nanocrystalline films composed of vertical elliptical-shaped grainy morphology demonstrated a high optical transmittance of 75% with an estimated optical bandgap of 2.38 eV. The dry lithiated nano-crystalline V 2 O 5 films demonstrated an optical modulation of 36.1% with a coloration efficiency value of 26.2 cm 2 /C at a wavelength of 550 nm. As-deposited nano-crystalline V 2 O 5 thin films demonstrated a constant discharge capacity of about 60 μAh cm −2 μm −1 for a few cycles at room temperature in the potential window of 4.0 to 2.5 V.

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In situ Raman microspectrometry investigation of electrochemical lithium intercalation into sputtered crystalline V2O5 thin films

Cited by 59 publications

References 52 publications

Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Design and comparison of ex situ and in situ devices for Raman characterization of lithium titanate anode material

Spectroscopic and electrochromic properties of activated reactive evaporated nano-crystalline V2O5 thin films grown on flexible substrates

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In situ Raman microspectrometry investigation of electrochemical lithium intercalation into sputtered crystalline V2O5 thin films

Cited by 59 publications

References 52 publications

Structural modifications of LixV2O5 in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Structural modifications of LixV2O5 in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Design and comparison of ex situ and in situ devices for Raman characterization of lithium titanate anode material

Spectroscopic and electrochromic properties of activated reactive evaporated nano-crystalline V2O5 thin films grown on flexible substrates

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Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry

Structural modifications of Li_xV₂O₅ in a composite cathode (0≤x < 2) investigated by Raman microspectrometry