Thermal dynamics and optimization on solid-state reaction for synthesis of Li2MnSiO4 materials

Gao, Kun; Dai, Changsong; Lv, Jing; Li, Shu-Dan

doi:10.1016/j.jpowsour.2012.03.048

Cited by 28 publications

(11 citation statements)

References 33 publications

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“…The vibrational behaviors of [TiO x ] polyhedrons are collected in Figure S1 b. The marked bands in Li 2 MnSiO 4 sample are related to [SiO 4 ] tetrahedrons (528, 579, 889 and 920 cm −1 ) and C−O vibrational mode (1450 and 1510 cm −1 ) . However, the bands located at 410.7 and 433.9 cm −1 are detected only in Li 2 Mn 0.85 Ti 0.15 SiO 4 sample, which are associated with [TiO 6 ] octahedrons .…”

Section: Resultsmentioning

confidence: 99%

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Zhao

Wei

et al. 2018

ChemistrySelect

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Li2MnSiO4 cathode material suffers from structural distortion caused by irreversible transition of [MnO4] tetrahedron to [MnO6] octahedron and layer exfoliation upon full delithiation, thus resulting in rapid capacity decay during cycling. In this study, Ti was introduced into the Mn site in Li2MnSiO4 as pillars to prevent the structural collapse. The results showed that [TiO4] tetrahedrons and [TiO6] octahedrons coexisted in Mn sites, and the proportion of [TiO6] octahedrons increased with increasing Ti. [TiOx] pillared Li2MnSiO4 samples presented greatly improved cycling stability, especially [TiO6] enriched Li2Mn0.85Ti0.15SiO4, which achieved the highest initial Coulumbic efficiency (86%) and the best capacity retention at C/20 rate. Moreover, Li2Mn0.85Ti0.15SiO4 exhibited excellent rate performance and retained 93% of initial discharge capacity after 50th cycles at C/2 rate. Ex‐situ XPS revealed [TiOx] pillars, especially [TiO6] pillars facilitated the reversible transition of [MnOx] during cycling. Ex‐situ XRD demonstrated better structure reversibility of [TiO6] enriched sample. The enhanced structural reversibility and cycling stability are ascribed to the pillaring effect of [TiOx], especially large [TiO6] octahedrons in structure, which ensure the reversible oxidation/reduction of Mn and alleviate the layer exfoliation during cycling.

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Section: Resultsmentioning

confidence: 99%

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Zhao

Wei

et al. 2018

ChemistrySelect

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“…These characteristic vibrational modes are in agreement with the observed results in literature. [23][24][25][26] The presence of carbon can noticed from the C-O vibrational modes near 1500 cm À1 for both orthorhombic and monoclinic LMS samples, which is not seen for solid state orthorhombic LMS material. These observations conrm the presence of carbon coating in sol-gel synthesized nanostructured materials.…”

Section: Resultsmentioning

confidence: 99%

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials

et al. 2017

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Li 2 MnSiO 4 is a promising cathode material for lithium ion rechargeable batteries, however, synthesizing the desired crystallographic phase is challenging. We report the synthesis and electrochemical charge/ discharge studies of carbon coated nanostructured Li 2 MnSiO 4 in orthorhombic and monoclinic crystallographic phases. Li 2 MnSiO 4 has been synthesized using solid state and sol-gel processes in bulk and nano-geometries without and with carbon coatings. The electrochemical performance of these Li 2 MnSiO 4 samples was measured at a C/20 charge/discharge rate within 1.

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“…Reaction dynamics: The Kissinger differential method has been widely utilized to estimate the activation energy of reaction with its advantage not requiring any detailed information on the reaction mechanism 6 . The reaction activation energy (E) can be calculated by Kissinger equation 7 :…”

Section: Resultsmentioning

confidence: 99%

Thermodynamics and Kinetics of Reaction Between NaCl and KF

Yang¹,

Wang²,

Tang³

et al. 2014

Asian J. Chem.

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Thermodynamics and kinetics of reaction between NaCl and KF were investigated. The negative Gibbs free energy change for the reaction indicated that the reaction was thermodynamically possible. Differential thermal analysis was used to study the reaction. Differential thermal analysis analysis revealed that the reaction between NaCl and KF occurred at 595 °C after a eutectic liquid formation at 582 °C and its activation energy was calculated to be 805 KJ/mol using Kissinger differential method. Moreover, powder X-ray diffraction measurement further confirmed the formation of NaF and KCl.

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Thermal dynamics and optimization on solid-state reaction for synthesis of Li2MnSiO4 materials

Cited by 28 publications

References 33 publications

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials

Thermodynamics and Kinetics of Reaction Between NaCl and KF

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Thermal dynamics and optimization on solid-state reaction for synthesis of Li2MnSiO4 materials

Cited by 28 publications

References 33 publications

Improved Structural Reversibility and Cycling Stability of Li2MnSiO4 Cathode Material by the Pillar Effect of [TiOx] Polyanions

Improved Structural Reversibility and Cycling Stability of Li2MnSiO4 Cathode Material by the Pillar Effect of [TiOx] Polyanions

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li2MnSiO4cathode materials

Thermodynamics and Kinetics of Reaction Between NaCl and KF

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Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials