Memory effect highlighting in silicon anode for high energy density lithium-ion batteries

Michel Ulldemolins (1, 2) , Frédéric Le Cras (2) , Brigitte Pecquenard (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 LITEN - Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les nanomatériaux

A memory effect occurring on silicon electrodes during lithium insertion/deinsertion was revealed by means of electrochemical characterizations. The reversible capacity fading is triggered when the electrodes are cycled between Li-rich compositions, which are actually achieved in selected conditions (current density, voltage window, electrode thickness). It is correlated with a structural evolution of Li-rich alloys, i.e. the crystallization of Li15Si4 or the probable ordering of other Li-rich phases. It should be avoided in Li-ion practical cells by an appropriate cell design.

Mots clés: Memory effect; Silicon electrode; Lithium-silicon alloys; Li15Si4; Lithium-ion batteries

Domaines: Matériaux

Michel Ulldemolins, Frédéric Le Cras, Brigitte Pecquenard. Memory effect highlighting in silicon anode for high energy density lithium-ion batteries. Electrochemistry Communications, 2013, 27, pp.22-25. ⟨10.1016/j.elecom.2012.10.027⟩. ⟨hal-00762228⟩