Influence of the microstructure on dielectric and conducting properties of vanadium pentoxide

Ragot, F.; Badot, Jean-Claude; Baffier, N.; Fourrier-Lamer, Arlette

doi:10.1039/jm9950501155

Cited by 22 publications

(46 citation statements)

References 9 publications

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“…This procedure, which is recorded by homemade software, is obtained by successive subtractions of the different contributions from low to high frequencies. [22][23][24][25][26][27]51,52] Dielectric relaxations are often described by the complex Cole-Cole function,…”

Section: Study Of the Electrical Properties Of The Electrodesmentioning

confidence: 99%

“…Several polarization mechanisms at different scales with distinct characteristic frequencies can be separated and treated individually. When the frequency increases, different kinds of polarization appear in following order: a) interfacial polarization due to the existence of cluster and particle boundaries, [22][23][24][25] which give rise to relaxations in the low-frequency domain; and b) orientational polarization due to local charge motions (e.g., small polarons hopping in oxides), [22][23][24][25][26][27][28][29] which give rise to relaxations in the radio-and microwave frequency domains. The composite electrodes studied here were thoroughly characterized in our previous work.…”

Section: Introductionmentioning

confidence: 99%

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A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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International audienceThe broadband dielectric spectroscopy technique is applied, for the first time, to a composite material used as an electrode for lithium battery. The electrical properties (permittivity and conductivity) are measured from low (a few Hz) to microwave (a few GHz) frequencies. The results demonstrate that the broadband dielectric spectroscopy technique is very sensitive to the different scales of the electrode architecture involved in electronic transport, from interatomic distances to macroscopic sizes, as well as to the morphology at these scales, coarse or fine distribution of the constituents. This work opens up new prospects for a more fundamental understanding and more rational optimization of the electronic transport in composite electrodes for lithium batteries and other electrochemical energy storage technologies (including other batteries, supercapacitors, low- and medium-temperature fuel cells), electrochemical sensors and conductor-insulator composite materials

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Section: Study Of the Electrical Properties Of The Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The interpretation of dielectric and conductivity spectra was made only possible through the knowledge of the chemical properties (composition, ageing and surface states, structure and microstructures of the samples [15]). We must not forget that the elaboration processing of the samples also plays an important role on the electrical properties of the electrode (pressure to obtain samples, mixture process and environmental humidity).…”

Section: Resultsmentioning

confidence: 99%

Interest in broadband dielectric spectroscopy to study the electronic transport in materials for lithium batteries

Badot

Lestriez

Dubrunfaut

2016

Materials Science and Engineering: B

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“…In previous studies [21,22], we have shown that the dielectric properties between 10 and 10 10 Hz can provide very important information regarding small-polaron dynamics in powdered compounds. In the present work, we report the first detailed study concerning the dielectric and conductivity spectroscopy of Li 1−x Ni 1+x O 2 compound (x = 0.03) from 10 to 10 10 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…So, the conductivity measurements by usual dc or low-frequency techniques, which have shown the semiconducting behaviour of LiNiO 2 , cannot give any information on the electrical transport properties [18,19] owing to the complexity of the microstructures in compounds of this type: the existence of grain boundary barriers and of agglomeration of powder particles in some cases. Strong frequency dependence of the permittivity in the lowfrequency region was noted in many polycrystalline samples which consist of semiconducting grains (single crystals) separated by quasi-insulating grain boundary layers [20][21][22]. In this scheme, the central core (bulk) of the grains is surrounded by a quasi-insulating depletion or accumulation layer.…”

Section: Introductionmentioning

confidence: 99%

High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index

Shinoda¹,

Saito²,

Kondo³

et al. 2003

Jpn. J. Appl. Phys.

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Dielectric and conductivity spectra of the compound Li 1−x Ni 1+x O 2 (x = 0.03) are reported and analysed. The spectra were recorded for compacted powders within the broad frequency range 10-10 10 Hz at temperatures varying between 210 and 300 K. The evolution of the spectra of the sample with respect to the damage under air allows us to define two regimes: the first one is an interfacial regime and the second a bulk regime. The frequency of crossover (ν co ) between the two regimes lies in the interval 1 × 10 9 and 2 × 10 9 Hz at room temperature. At frequencies below ν co , the spectral analysis shows dielectric relaxations due to interfacial polarization phenomena in the sample. The complex resistivity plots (for ν < ν co ) allowed the determination of the dc conductivity of Li 1−x Ni 1+x O 2 versus temperature. At frequencies greater than ν co , one dielectric relaxation corresponding to small-polaron hopping has been observed. The corresponding relaxation frequency is thermally activated with an activation energy of 0.15-0.16 eV and a pre-exponential factor ν 0 ≈ 3×10 12 -4 × 10 12 Hz, which is of the order of the longitudinal-optical-phonon frequency ν L O . The conduction behaviour is interpreted in terms of hopping of small polarons (holes) on an oxygen network.

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Influence of the microstructure on dielectric and conducting properties of vanadium pentoxide

Cited by 22 publications

References 9 publications

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Interest in broadband dielectric spectroscopy to study the electronic transport in materials for lithium batteries

High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index

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