On the preparation and characterization of a new polymorph of V2O5

Coccíantelli, J.M.; Gravereau, P.; Doumerc, Jean‐Pierre; Pouchard, Michel; Hagenmuller, Paul

doi:10.1016/0022-4596(91)90323-a

Cited by 109 publications

(94 citation statements)

References 4 publications

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“…It comes out that the α-, ε-, δ-and γ -Li x V 2 O 5 phases are identified in the 0 < x < 2 composition range, in good agreement with previous XRD studies on Li x V 2 O 5 composite electrodes. [6,9,16] Fig. 7 reports the evolution of the a and c lattice parameters as a function of the Li uptake.…”

Section: Resultsmentioning

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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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%

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 widely known phase is the orthorhombic V 2 O 5 , also known as ␣-V 2 O 5 [5]. A metastable variety of Vanadium pentoxide is ␥-V 2 O 5 , obtained at atmospheric pressure by chemical or electrochemical deintercalation of Li from ␥-LiV 2 O 5 [6]. ␥-V 2 O 5 is orthorhombic and easily returns to ␣-V 2 O 5 upon heating at T higher than 340 • C.…”

Section: Introductionmentioning

confidence: 99%

V2O5 phase diagram revisited at high pressures and high temperatures

Balog

Orosel

Čančarević

et al. 2007

Journal of Alloys and Compounds

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“…Conversely, if more than one lithium ion per structural unit is accommodated, irreversible structural changes resulting in the formation of the γ-LiV 2 O 5 phase take place. [7][8][9] The layered structure of γ-LiV 2 O 5 with a mixed V 5+ /V 4+ valence state of the metal ions, together with relatively high lithium content, makes this phase very interesting as cathode material for lithium-ion batteries. [10][11][12][13][14] In such batteries using carbon as the anode material, the cathode active material must be in fully lithiated state thus allowing Li + ions to be produced through the oxidation of the positive electrode during the first charge.…”

Section: Introductionmentioning

confidence: 99%

“…6 From the electrochemical point of view the voltage composition curve of V 2 O 5 was found to be in accord with this Li x V 2 O 5 phase diagram. 4,[7][8][9] Indeed, several structural transformations of the bulk material take place depending on the amount of Li ions x intercalated in V 2 O 5 pristine structure. The α-, ε-, and δ-Li x V 2 O 5 phases were identified in the 0 < x ≤ 1 composition range and a reversibility of the Li insertion was established, i.e.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Computational Study of Structural Changes in γ-LiV₂O₅Cathodic Material Induced by Lithium Intercalation

Smirnov

Roginskiĭ²,

Kazimirov

et al. 2015

J. Phys. Chem. C

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Structure, electronic states, and vibrational dynamics of γ-LiV 2 O 5 were studied by combined use of the quantum-chemical calculations and Raman spectroscopy. The spin-polarized DFT+U calculations correctly mimic the structural changes induced by the Li intercalation into the V 2 O 5 framework. The analysis of the density of electronic states shows that the electrons of Li atoms are transferred to the Vb atoms and are aligned in ferromagnetic order. The charge distribution in the system reflects the change of valence state of the Vb atoms from 5+ to 4+ and it is in line with changes of Vb-O bond lengths. The calculated Raman spectrum of the γ-LiV 2 O 5 structure is in line with the experimental Raman spectra that allows a reliable assignment of all prominent Raman peaks. The comparison of the spectra of γ-LiV 2 O 5 and γ ′ -V 2 O 5 indicates spectral signatures of structural changes induced by the Li insertion into the γ ′ -V 2 O 5 lattice. Results of the study opens the opportunity of using the Raman spectroscopy for characterization of structural modifications of the vanadate framework upon intercalation of guest species.

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On the preparation and characterization of a new polymorph of V2O5

Cited by 109 publications

References 4 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

V2O5 phase diagram revisited at high pressures and high temperatures

Spectroscopic and Computational Study of Structural Changes in γ-LiV₂O₅Cathodic Material Induced by Lithium Intercalation

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On the preparation and characterization of a new polymorph of V2O5

Cited by 109 publications

References 4 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

V2O5 phase diagram revisited at high pressures and high temperatures

Spectroscopic and Computational Study of Structural Changes in γ-LiV2O5Cathodic Material Induced by Lithium Intercalation

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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

Spectroscopic and Computational Study of Structural Changes in γ-LiV₂O₅Cathodic Material Induced by Lithium Intercalation