Etude structurale de Li2MnO3

Riou, A.; Lecerf, A.; Gérault, Y.; Cudennec, Y.

doi:10.1016/0025-5408(92)90055-5

Cited by 46 publications

(27 citation statements)

References 5 publications

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“…[24] All these structures can be derived (upon Li substitution for Mn) from the rhombohedral a-NaFeO 2 structure, which in turn is structurally related to the (face centered cubic) B1-NaCl structure. In rhombohedral NaFeO 2 , O occupies B1-NaCl anion positions, while Na-and Fe-hexagonal close-packed planes alternately occupy cation sites.…”

Section: Mnomentioning

confidence: 99%

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

et al. 2010

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Li-ion batteries are promising candidates for electrical energy storage in applications ranging from portable electronics to hybrid and electric vehicles. In this context, layered compounds in the Li(1+delta)(TM(x)Mn(1-x))(1-delta)O(2) family (TM = transition metal) have received much attention due to their high capacity and stability. In this Research News article we describe recent advances on structural characterization of Li-ion electrode materials using state-of-the-art electron microscopy. Direct evidence of the monoclinic nature of Li(2)MnO(3) has been provided. It has been demonstrated that differences in Z-contrast imaging between Li(2)MnO(3) and LiTMO(2) may be used to screen samples for phase separation in the 10-100 nm scale.

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Section: Mnomentioning

confidence: 99%

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

et al. 2010

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“…It has to be mentioned that essentially two different structures for Li 2 MnO 3 are reported in literature. Jansen and Hoppe 18) as well as Riou et al 19) found a monoclinic cell, spacegroup C2/c, Pearson Symbol mC8, with a ³ 4.92 ¡, b ³ 8.53 ¡, c ³ 9.61 ¡ and ¢ ³ 99.5°. In contrast, Strobel and Lambert-Andron 1) found a smaller monoclinic cell, spacegroup C2/m, Pearson Symbol mC4, with a = 4.937 ¡, b = 8.532 ¡, c ³ 5.030 ¡ and ¢ ³ 109.5 ¡.…”

Section: Synthesis Thermal Stability and Xrd Of LI 2 Mnomentioning

confidence: 99%

Enthalpy of formation and heat capacity of Li<sub>2</sub>MnO<sub>3</sub>

Cupid

Gebert

et al. 2016

J. Ceram. Soc. Japan

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The enthalpy of formation of Li 2 MnO 3 was measured by high temperature oxide solution calorimetry in a sodium molybdate solvent and the heat capacity of the compound was determined using differential scanning calorimetry. The enthalpy of formation of Li 2 MnO 3 from the elements is slightly less exothermic than that of the orthorhombic and monoclinic modifications of LiMnO 2 but more exothermic than that of LiNiO 2 , LiCoO 2 , the LiNi 1¹x Co x O 2 solid solutions and the Li 1+x Mn 2¹x O 4 spinels. The heat capacity of Li 2 MnO 3 is also slightly lower than the estimated heat capacity based on stoichiometric amounts of Li 2 O and MnO 2 according to the Neumann-Kopp approximation. The slight differences in heat capacities are attributed to the differences in the bonding environments of Li + ions in Li 2 MnO 3 and the constituent binary oxide Li 2 O. The thermochemical data presented here are essential for the advanced thermodynamic modeling of multicomponent electrode materials based on the promising xLi 2 MnO 3 ·(1 ¹ x)LiMO 2 nano-composite cathode system.

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“…A first work on X-ray powder diffraction data assigned the space group C2/c to Li/MnO3, according to the structure model of the isotype compound LizSnO3 (Jansen & Hoppe, 1973). Recently, single-crystal diffraction studies proposed both space group C2/c (Riou, Lecerf, Gerault & Cudennec, 1992) and C2/m (Strobel & LambertAndron, 1988): in this last case the presence of a mirror…”

Section: Introductionmentioning

confidence: 99%

Ab InitioStructure Determination of Li₂MnO₃from X-ray Powder Diffraction Data

Massarotti¹,

Bini²,

Capsoni³

et al. 1997

J Appl Crystallogr

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The results of the structural determination of Li2MnO3 from X-ray powder diffraction data and the refinement by the Rietveld technique are presented. The Li2MnO3 structure has a monoclinic cell with space group C2/m(Z=4) and cell parameters a=4.9246 (1) and S=3.52. Such a so~'ution agrees with a single-crystal structure determination previously reported in the literature and allows other hypotheses to be rejected. plane parallel to the ac plane was underlined that the other authors did not consider.The aim of this work is to demonstrate that conventional laboratory X-ray powder diffraction data may very well be used for structure determination of compounds of low symmetry, like Li2MnO3. For such a compound, a detailed comparison with the pertinent single-crystal data is possible. The programs actually available for the treatment of powder data are sufficiently reliable, and represent a valid choice when single-crystal data cannot be obtained. Many different programs were used in each step for the ab initio structure determination, both to test the solution found and to compare different computing methods.

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Etude structurale de Li2MnO3

Cited by 46 publications

References 5 publications

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

Enthalpy of formation and heat capacity of Li<sub>2</sub>MnO<sub>3</sub>

Ab InitioStructure Determination of Li₂MnO₃from X-ray Powder Diffraction Data

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Etude structurale de Li2MnO3

Cited by 46 publications

References 5 publications

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

Local Structure of Layered Oxide Electrode Materials for Lithium‐Ion Batteries

Enthalpy of formation and heat capacity of Li<sub>2</sub>MnO<sub>3</sub>

Ab InitioStructure Determination of Li2MnO3from X-ray Powder Diffraction Data

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Ab InitioStructure Determination of Li₂MnO₃from X-ray Powder Diffraction Data