Surface film formation on a graphite electrode in Li-ion batteries: AFM and XPS study

S. Leroy , Fabian Blanchard , Rémi Dedryvère (1) , Hervé Martinez (1) , B. Carre (2) , D. Lemordant , Danielle Gonbeau (3, 1)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 SPAM - Service des Photons, Atomes et Molécules
3 LCTPCM - Laboratoire de Chimie théorique et Physico-chimie moléculaire

The formation of a passivation film (solid electrolyte interphase, SEI) at the surface of the negative electrode of full LiCoO2/graphite lithium-ion cells using LiPF6 (1M) in carbonate solvents as electrolyte was investigated by means of x-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The analyses were carried out at different potentials of the first and the fifth cycles, showing the potentialdependent character of the surface-film species formation. These species were mainly identified as Li2CO3 up to 3.8 V and LiF up to 4.2 V. This study shows the formation of the SEI during charging and its partial dissolution during discharge. Copyright © 2005 John Wiley & Sons, Ltd.

Mots clés: Li-ion battery; graphite; electrode/electrolyte interface; XPS; AFM

Domaines: Chimie; Matériaux

S. Leroy, Fabian Blanchard, Rémi Dedryvère, Hervé Martinez, B. Carre, et al.. Surface film formation on a graphite electrode in Li-ion batteries: AFM and XPS study. Surface and Interface Analysis, 2005, 37 (10), pp.773-781. ⟨10.1002/sia.2072⟩. ⟨hal-01504000⟩