HUA, Huo; CHAMAS, Mohamad; LIPPENS, Pierre-Emmanuel; MÉNÉTRIER, Michel

doi:10.1021/jp210017b

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HUA, Huo
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]

CHAMAS, Mohamad
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM ICMMM]

LIPPENS, Pierre-Emmanuel
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM ICMMM]

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Ce document a été publié dans

Journal of Physical Chemistry C. 2012, vol. 116, n° 3, p. 2390-2398

American Chemical Society

Résumé en anglais

The composition of the solid electrolyte interface (SEI) layer on the Li-FeSn2 negative electrode has been determined by a multinuclear solid state NMR study. The strong e-nuclear dipolar and contact interactions between the as-formed superparamagnetic Fe nanoparticles and the SEI layer allows a layer wise observation highly depending on the proximity. Li+ from LiPF6, which is traditionally considered as a postdeposited product from the electrolyte solution,has been observed as presenting different solvation states by 19F → 7Li cross polarization magic angle spinning (CPMAS) NMR. Direct contact between LiOH and LixSn or Fe nanoparticles is suggested by Fermi-Contact shifts of −11 and −2 ppm observed in 7Li and 1H NMR spectra, respectively. The LixSn alloy signal remains invisible to 7Li NMR due to the close proximity to the Fe nanoparticles. Effects of different discharging rates and aging at the discharge state are discussed as well.< Réduire

Mots clés en anglais

Nuclear Magnetic Resonance

Electrodes

Inorganic coumpounds

Interface

Batteries

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Multinuclear NMR study of the solid electrolyte interface on the Li-FeSn2 negative electrodes for Li-ion batteries

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Résumé en anglais

Mots clés en anglais

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