CobaltMaghrebV1, Main, Exploration, bibRecord, 000443

Study of the local structure of LiNi0.33+δMn0.33+δCo0.33-2δO2 (0.025 < δ ≤ 0.075) oxides

Identifieur interne : 000443 ( Main/Exploration ); précédent : 000442; suivant : 000444

Study of the local structure of LiNi0.33+δMn0.33+δCo0.33-2δO2 (0.025 < δ ≤ 0.075) oxides

Auteurs : K. Ben-Kamel [Tunisie] ; N. Amdouni [Tunisie] ; A. Mauger [France] ; Cm. Julien [France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2012.

RBID : Pascal:12-0217771

Descripteurs français

Pascal (Inist)
- Structure locale, Procédé sol gel, Structure lamellaire, Mode vibration, Méthode Rietveld, Diffraction RX, Spectre Raman, Spectrométrie FTIR, Angle magique, Résonance magnétique nucléaire, Microscopie électronique transmission, Lithium Métal transition Oxyde Mixte, Nanoparticule, Réseau rhomboédrique, Cristal lamellaire, Nanocristal.

English descriptors

KwdEn :
- Fourier-transformed infrared spectrometry, Lamellar structure, Layered crystals, Lithium Transition elements Oxides Mixed, Local structure, Magic angle, Nanocrystal, Nanoparticles, Nuclear magnetic resonance, Raman spectra, Rietveld method, Sol-gel process, Transmission electron microscopy, Trigonal lattices, Vibrational modes, XRD.

Abstract

A series of oxides of the composition LiNi_y+δMn_y+δCo_y-2δO₂ (y=0.33; δ=0.025, 0.05, 0.075) were synthesized using the sol-gel method assisted by citric acid as chelating agent. The resulting nano-sized particles crystallize with a layered structure in the rhombohedral system. They exhibit an ordered rock-salt α-NaFeO₂-type structure (R3m space group) having an interlayer spacing close to 0.47 nm. Long- and short-range structural properties were characterized using several techniques such as X-ray diffraction (XRD), Raman scattering (RS), Fourier transform infrared (FTIR) and ⁷Li magic angle spinning (MAS) NMR spectroscopy, high-resolution transmission electron microscopy (HRTEM) and energy dispersive analysis of X-rays (EDAX). Rietveld refinements of the XRD diagrams and NMR resonance integration show that the concentration of Ni²⁺ ions located onto Li-3b sites is lower than 3% for the three samples. HRTEM images show layered structure without dislocations. The role of the cobalt is investigated quantitatively. The results show that the increasing cobalt content induces better crystallinity, smaller cation mixing, and a change of particles morphology, from octahedron- to spherical-like shape with size in the range 200-350 nm.

Affiliations:

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Le document en format XML

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Mn<sub>0.33+δ</sub>
Co<sub>0.33-2δ</sub>
O<sub>2</sub>
 (0.025 < δ ≤ 0.075) oxides</title>
<author><name sortKey="Ben Kamel, K" sort="Ben Kamel, K" uniqKey="Ben Kamel K" first="K." last="Ben-Kamel">K. Ben-Kamel</name>
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Mn<sub>0.33+δ</sub>
Co<sub>0.33-2δ</sub>
O<sub>2</sub>
 (0.025 < δ ≤ 0.075) oxides</title>
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<author><name sortKey="Amdouni, N" sort="Amdouni, N" uniqKey="Amdouni N" first="N." last="Amdouni">N. Amdouni</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Université Tunis-El Manar, U.R. Physico-Chimie des Matériaux Solides</s1>
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<author><name sortKey="Julien, Cm" sort="Julien, Cm" uniqKey="Julien C" first="Cm." last="Julien">Cm. Julien</name>
<affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Universite Pierre et Marie Curie-Paris-6, Laboratoire des Electrolytes, Colloïdes et Systèmes Analytiques (PECSA), 4 place Jussieu</s1>
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<term>Lamellar structure</term>
<term>Layered crystals</term>
<term>Lithium Transition elements Oxides Mixed</term>
<term>Local structure</term>
<term>Magic angle</term>
<term>Nanocrystal</term>
<term>Nanoparticles</term>
<term>Nuclear magnetic resonance</term>
<term>Raman spectra</term>
<term>Rietveld method</term>
<term>Sol-gel process</term>
<term>Transmission electron microscopy</term>
<term>Trigonal lattices</term>
<term>Vibrational modes</term>
<term>XRD</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Structure locale</term>
<term>Procédé sol gel</term>
<term>Structure lamellaire</term>
<term>Mode vibration</term>
<term>Méthode Rietveld</term>
<term>Diffraction RX</term>
<term>Spectre Raman</term>
<term>Spectrométrie FTIR</term>
<term>Angle magique</term>
<term>Résonance magnétique nucléaire</term>
<term>Microscopie électronique transmission</term>
<term>Lithium Métal transition Oxyde Mixte</term>
<term>Nanoparticule</term>
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<front><div type="abstract" xml:lang="en">A series of oxides of the composition LiNi<sub>y+δ</sub>
Mn<sub>y+δ</sub>
Co<sub>y-2δ</sub>
O<sub>2</sub>
 (y=0.33; δ=0.025, 0.05, 0.075) were synthesized using the sol-gel method assisted by citric acid as chelating agent. The resulting nano-sized particles crystallize with a layered structure in the rhombohedral system. They exhibit an ordered rock-salt α-NaFeO<sub>2</sub>
-type structure (R3m space group) having an interlayer spacing close to 0.47 nm. Long- and short-range structural properties were characterized using several techniques such as X-ray diffraction (XRD), Raman scattering (RS), Fourier transform infrared (FTIR) and <sup>7</sup>
Li magic angle spinning (MAS) NMR spectroscopy, high-resolution transmission electron microscopy (HRTEM) and energy dispersive analysis of X-rays (EDAX). Rietveld refinements of the XRD diagrams and NMR resonance integration show that the concentration of Ni<sup>2+</sup>
 ions located onto Li-3b sites is lower than 3% for the three samples. HRTEM images show layered structure without dislocations. The role of the cobalt is investigated quantitatively. The results show that the increasing cobalt content induces better crystallinity, smaller cation mixing, and a change of particles morphology, from octahedron- to spherical-like shape with size in the range 200-350 nm.</div>
</front>
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Study of the local structure of LiNi0.33+δMn0.33+δCo0.33-2δO2 (0.025 < δ ≤ 0.075) oxides

Study of the local structure of LiNi0.33+δMn0.33+δCo0.33-2δO2 (0.025 < δ ≤ 0.075) oxides

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

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Pour mettre un lien sur cette page dans le réseau Wicri