Thermodynamic and spectroscopic properties of spinel with the formula Li4/3Ti5/3O4

Knyazev, A. V.; Смирнова, Н. Н.; Mączka, Mirosław; Knyazeva, S.S.; Letyanina, I. A.

doi:10.1016/j.tca.2013.02.019

Cited by 22 publications

(12 citation statements)

References 31 publications

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“…The 426 cm –1 band is attributed to the E g mode due to vibrational stretching of the Li–O covalent bond inside LiO 4 tetrahedra . The third band, located at 231 cm –1 , is related to F 2g modes originating from both oxygen and lithium displacements in lower frequencies of the spectra . Some other weaker bands are also observed, at 751, 344, and 264 cm –1 , and can be attributed to LTO .…”

Section: Results and Discussionmentioning

confidence: 90%

“…57 The third band, located at 231 cm −1 , is related to F 2g modes originating from both oxygen and lithium displacements in lower frequencies of the spectra. 58 Some other weaker bands are also observed, at 751, 344, and 264 cm −1 , and can be attributed to LTO. 59 The LTO LowF sample spectrum shows no significant changes in the band positions or shapes compared to pristine LTO.…”

Section: Resultsmentioning

confidence: 94%

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Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey

Charles-Blin

Ledeuil

Guérin

et al. 2019

ACS Appl. Energy Mater.

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Li4Ti5O12 (LTO) particles are successfully modified by an atomic layer fluorination process using a one-shot solvent-free synthesis performed with a solid-state fluorinating agent, xenon difluoride, at room temperature. LTO is reported as a promising anode material for lithium-ion batteries (LIBs) where high charging rates and long cycle life are required, because of its high potential preventing lithium dendrite deposition. The fluorination leads to the formation of passivating “LiF” environments at the particle surface using the lowest amount of fluorine reported in the literature. Thanks to a multiprobing strategy, the impact of the fluorination on nonmodified, noncoated LTO has been characterized from the bulk to the extreme surface. The XRD patterns as well as the Raman spectra show no structural modification of the bulk while the combination of the XPS and NMR analysis gives insights about the impact of the fluorination on the entirety of the material. Auger fluorine chemical mapping displays the spatial distribution of a fluorinated layer all around the LTO particles.

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Section: Results and Discussionmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 94%

Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey

Charles-Blin

Ledeuil

Guérin

et al. 2019

ACS Appl. Energy Mater.

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“…1) is the Riemann n-function, and h max is the characteristic temperature. As follows from inferences [12], D can be evaluated from the experimental data on the temperaturedependent heat capacities from a slope of the corresponding rectilinear sections of the plot ln C v versus ln T. Without a substantial uncertainty, it may be assumed that at [14][15][16][17].…”

Section: Heat Capacitymentioning

confidence: 99%

Thermodynamic properties and X-ray diffraction of Bi4Ti3O12

Knyazev

Крашенинникова

Смирнова

et al. 2015

J Therm Anal Calorim

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The temperature dependence of heat capacity of Bi 4 Ti 3 O 12 has been measured for the first time in the range from 7 to 346 K by precision adiabatic vacuum calorimetry. The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity, enthalpy H o (T) -H o (0), entropy S o (T) -S o (0), and Gibbs function G o (T) -H o (0), in the range from T ? 0 to 346 K. The structure of Bi 4 Ti 3 O 12 is refined by the Rietveld method (space group Fmmm, Z = 4) at temperatures of 173, 273, 373, 473 K. Thermal deformation model is proposed on the basis of structural data.

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“…The second one is the low intensity but clear band near 620 cm −1 . Similar to low intensive band near 520 cm −1 , discussed in our recent paper, this band is one of the “mysterious” LTO bands, mentioned only in several papers . The nature of these “strange” bands (below 200 cm −1 and near 620 cm −1 ) is an interesting subject of investigation, but it lays out of our paper goal—characterization of the carbon coating, so we will skip its discussion.…”

Section: Resultsmentioning

confidence: 68%

Statistical Raman spectroscopy characterization of carbon additive in low‐C composites: Toward industrial quality control

Pelegov

Koshkina

Slautin

et al. 2019

J Raman Spectroscopy

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Two-phase composites with a low part of the auxiliary phase (about a few percent) are quite complex objects for qualitative and quantitative characterization. Battery electrode materials are typical example of such composites, comprising the active material with the small amount of conductive additive (carbon-based, mostly). This article presents an original "big-data" approach for morphological and structural characterization of carbon-coating component in Li 4 Ti 5 O 12 /C composites by statistical Raman spectroscopy. Although the most published Raman-spectroscopy-based papers focus on structural characterization only, in this work, we show that morphological study can be even more informative. Our approach proposed for monitoring the carbon coverage efficiency, and morphological mesoscale heterogeneity of low-C composites can be used for optimization of carbon-coating procedure and industrial quality control of carbon-coated electrode materials.

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Thermodynamic and spectroscopic properties of spinel with the formula Li4/3Ti5/3O4

Cited by 22 publications

References 31 publications

Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey

Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey

Thermodynamic properties and X-ray diffraction of Bi4Ti3O12

Statistical Raman spectroscopy characterization of carbon additive in low‐C composites: Toward industrial quality control

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Thermodynamic and spectroscopic properties of spinel with the formula Li4/3Ti5/3O4

Cited by 22 publications

References 31 publications

Atomic Layer Fluorination of the Li4Ti5O12 Surface: A Multiprobing Survey

Atomic Layer Fluorination of the Li4Ti5O12 Surface: A Multiprobing Survey

Thermodynamic properties and X-ray diffraction of Bi4Ti3O12

Statistical Raman spectroscopy characterization of carbon additive in low‐C composites: Toward industrial quality control

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Product

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Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey

Atomic Layer Fluorination of the Li₄Ti₅O₁₂ Surface: A Multiprobing Survey