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Article Dans Une Revue Chemistry of Materials Année : 2011

Confirmation of the Domino-Cascade Model by LiFePO(4)/FePO(4) Precession Electron Diffraction

Résumé

A recent transmission electron microscopy (TEM) method using precession electron diffraction (PED) was used to obtain LiFePO(4) and FePO(4) phase mapping at the nanometer-scale level on a large number of particles of sizes between 50 and 300 nm in a partially charged cathode. Despite the similarity of the two phases (the difference of lattice parameters is <5%), the method gives clear results that have been confirmed using high-resolution transmission electron microscopy (HRTEM) and energy-filtered transmission electron microscopy/electron energy loss spectroscopy (EFTEM/EELS) experiments. The PED maps show that the particles are either fully lithiated or fully delithiated and, therefore, bring a strong support to the domino-cascade model at the nanoscale level (scale of a particle). A core-shell model or spinodal decomposition at mesoscale (scale of agglomerates of particles) is possible. Size effects on the transformation are also discussed.

Domaines

Matériaux
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Dates et versions

hal-00664175 , version 1 (29-01-2012)

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Citer

G. Brunetti, D. Robert, P. Bayle-Guillemaud, J.L. Rouviere, E.F. Rauch, et al.. Confirmation of the Domino-Cascade Model by LiFePO(4)/FePO(4) Precession Electron Diffraction. Chemistry of Materials, 2011, 23 (20), pp.4515-4524. ⟨10.1021/cm201783z⟩. ⟨hal-00664175⟩
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