Cation distribution and phase transformations in LiMn2−yTiyO4 solid solutions

Petrov, Κ.; Rojas, R.M.; Alonso, Pablo J.; Amarilla, José Manuel; Lazarraga, M. G.; Rojo, J. M.

doi:10.1016/j.solidstatesciences.2004.10.041

Cited by 22 publications

(27 citation statements)

References 22 publications

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“…By comparison with results from the literature [12,13], the percentage of transition metal ions in the 8a site was found significantly smaller in the case of the present samples and the cubic unit-cell parameter is also smaller than in the literature for x ≥ 0.5. This could be due to the nature of the different reactants used for the solid state synthesis : carbonate, acetate and hydroxide salts used in the present study are more reactive than commercial oxides.…”

Section: Powder X-ray Diffractionsupporting

confidence: 56%

“…In conclusion our XRD refinements appear to confirm the results of Petrov et al [13], although it contradicts the XPS results of Arillo et al [11]. Investigation by other methods would be necessary in order to confirm the cationic distribution of model 2.…”

Section: Powder X-ray Diffractionsupporting

confidence: 50%

“…Recently, Petrov et al [13] proposed another model for the cationic distribution in Table 1, the CBV are now in much better agreement with the EBV, indicating that this model is more realistic than the previous one. The unit-cell parameters and reliability factors are given in Table 2, and the final atomic coordinates, site occupancy factors, and isotropic thermal parameters are given in Table 3.…”

Section: Powder X-ray Diffractionmentioning

confidence: 85%

“…While writing the present paper, we have become aware of a recent publication by Petrov et al [13]: in that paper, the authors put forward a new structural model with partial occupancy of the 8a crystallographic site by Mn 2+ instead of Ti…”

Section: Introductionmentioning

confidence: 99%

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LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

et al. 2006

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LiMn 2-x Ti x O 4 compounds with 0 ≤ x ≤ 1 were prepared by solid state reaction and Pechini technique. Powder X-ray diffraction showed that all samples crystallize with the spinel crystal structure (S.G. Fd 3 m). The cubic unit-cell parameter increases with Ti content.The influence of the Ti content and cationic distribution on the magnetic properties of the compounds was studied by measuring the temperature and magnetic field dependences of the magnetization : substitution by non magnetic d 0 Ti 4+ ions appeared to weaken the magnetic interactions between manganese ions. The electrical properties of LiMnTiO 4 were studied by AC impedance spectroscopy and DC polarisation measurements, which revealed the electronic character of the conduction process.

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Section: Powder X-ray Diffractionsupporting

confidence: 56%

Section: Powder X-ray Diffractionsupporting

confidence: 50%

Section: Powder X-ray Diffractionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

et al. 2006

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“…Furthermore, a significant change in the Li K-edge is observed from the bulk to the surface of the annealed particle. [50,51] Therefore, it can be concluded from the spectra that the oxidation state of the Mn from the bulk to the surface varies, with predominantly Mn 2+ near the surface and Mn 3+ /Mn 4+ in the bulk. According to EELS quantification, the Ti concentration (≈7%) in the surface region is lower compared to the ideal TMO phase, indicating that there would be vacancies on the tetrahedral sites.…”

mentioning

confidence: 99%

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

et al. 2017

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A novel two-step surface modification method that includes atomic layer deposition (ALD) of TiO followed by post-annealing treatment on spinel LiNi Mn O (LNMO) cathode material is developed to optimize the performance. The performance improvement can be attributed to the formation of a TiMn O (TMO)-like spinel phase resulting from the reaction of TiO with the surface LNMO. The Ti incorporation into the tetrahedral sites helps to combat the impedance growth that stems from continuous irreversible structural transition. The TMO-like spinel phase also alleviates the electrolyte decomposition during electrochemical cycling. 25 ALD cycles of TiO growth are found to be the optimized parameter toward capacity, Coulombic efficiency, stability, and rate capability enhancement. A detailed understanding of this surface modification mechanism has been demonstrated. This work provides a new insight into the atomic-scale surface structural modification using ALD and post-treatment, which is of great importance for the future design of cathode materials.

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Cation Distribution and Phase Transformations in LiMn_2‐yTi_yO₄ (0.2 ≤ y ≤ 1.5) Solid Solutions.

Petrov¹,

Rojas²,

Alonso³

et al. 2005

ChemInform

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2 ≤ y ≤ 1.5) Solid Solutions. -The title compounds are synthesized by solid state reaction at 1100°C and characterized by powder XRD, TG, and EPR spectroscopy. Compounds in the composition range 0.2 ≤ y ≤ 1.0 crystallize in the space group Fd3m, whereas those with y > 1.0 crystallize in the space group P4332. The tetrahedral sites of the structures are occupied by Li + and Mn 2+ . The new compound LiMn 0.5 Ti 1.5 O 4 crystallizes in the space group P4332, with all Mn 2+ ions being located on tetrahedral sites. The title spinels are currently receiving significant attention as cathode materials for lithium ion batteries. -(PETROV, K.; ROJAS*, R. M.; ALONSO, P. J.; AMARILLA, J. M.; LAZARRAGA, M. G.; ROJO, J. M.; Solid State Sci. 7 (2005) 3, 277-286; Inst.

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Cation distribution and phase transformations in LiMn2−yTiyO4 solid solutions

Cited by 22 publications

References 22 publications

LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Cation Distribution and Phase Transformations in LiMn_2‐yTi_yO₄ (0.2 ≤ y ≤ 1.5) Solid Solutions.

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Cation distribution and phase transformations in LiMn2−yTiyO4 solid solutions

Cited by 22 publications

References 22 publications

LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

LiMn2−xTixO4 spinel-type compounds (x≤1): Structural, electrical and magnetic properties

Nanoscale Manipulation of Spinel Lithium Nickel Manganese Oxide Surface by Multisite Ti Occupation as High‐Performance Cathode

Cation Distribution and Phase Transformations in LiMn2‐yTiyO4 (0.2 ≤ y ≤ 1.5) Solid Solutions.

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Cation Distribution and Phase Transformations in LiMn_2‐yTi_yO₄ (0.2 ≤ y ≤ 1.5) Solid Solutions.