Reinvestigation of the magnetic behavior of O3–LiCoO₂

Alla Artemenko (1) , Michel Ménétrier (1) , Michaël Pollet (1) , Claude Delmas (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Stoichiometric high temperature LiCoO₂ obtained by long annealing in oxygen was characterized by electron spin resonance and magnetization measurements. Both methods allow identifying unambiguously not only the presence of traces of cobalt oxides in the material but also paramagnetic defects in lithium cobaltite itself. We report on the presence of surface Li⁺-O^- centers in pure LiCoO₂, which has not been observed before in this material, and on the presence of Co²⁺ related centers in argon- and subsequent oxygen-annealed samples.

Mots clés: Annealing; Lithium compounds; Magnetisation; Paramagnetic resonance; Secondary cells; Stoichiometry

Domaines: Matériaux

Alla Artemenko, Michel Ménétrier, Michaël Pollet, Claude Delmas. Reinvestigation of the magnetic behavior of O3–LiCoO₂. Journal of Applied Physics, 2009, 106 (6), pp.064914. ⟨10.1063/1.3226700⟩. ⟨hal-00432947⟩