Magnetic analysis of lamellar oxides for Li-ions batteries

X. Zhang (1) , C.M. Julien (2) , A. Mauger (1) , F. Gendron (3)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques
3 INSP - Institut des Nanosciences de Paris

We show that the investigation of magnetic properties is the best tool to identify and quantify the impurities and defects that limit the ability of the lamellar intercalation compounds for use as cathode for Li-ion batteries. The results are illustrated for LiNiO2, LiNi1-yCoyO2, LiCoO2, LiNi0.5Mn0.5O2, and LiNi1/3Mn1/3Co1/3O2 (LNMCO). Despite the extensive studies of these ionic compounds in the past, not only for practical use, but also for themselves, the present work reveals that the magnetic properties of these lamellar compounds have been largely misunderstood, and that, at contrast with the common belief, they do not belong to the family of two dimensional frustrated antiferromagnets. The misunderstanding comes from confusion between extrinsic and intrinsic effects. This distinction allows for an overall understanding of the intrinsic properties of these materials, and opens the route to their optimization, in particular for LNMCO that is the most promising element of this family.

Mots clés: Lamellar intercalation compounds; Lithium-ion batteries; Magnetic properties

Domaines: Physique Quantique [quant-ph]

X. Zhang, C.M. Julien, A. Mauger, F. Gendron. Magnetic analysis of lamellar oxides for Li-ions batteries. Solid State Ionics, 2011, 188 (1), pp.148-155. ⟨10.1016/j.ssi.2010.11.003⟩. ⟨hal-00616824⟩