Unravelling the morphological dependency of the LiNi0.6Mn0.2Co0.2O2 layered oxide reactivity in Li-ion batteries

Adrien Soloy (1) , Delphine Flahaut (2, 3) , Jean-Bernard Ledeuil (2, 3) , Joachim Allouche (2, 3) , Dominique Foix (2, 3) , Germain Vallverdu (2, 3) , Emmanuelle Suard (4) , Erwan Dumont (5) , Lucille Gal (5) , François Weill (1, 6, 3) , Laurence Croguennec (1, 6, 3)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
3 RS2E - Réseau sur le stockage électrochimique de l'énergie
4 ILL - Institut Laue-Langevin
5 SAFT [Bordeaux]
6 ALISTORE-ERI - Advanced Lithium Energy Storage Systems - ALISTORE-ERI

LiNi0.6Mn0.2Co0.2O2 is one of the most promising positive electrode material for Li-ion batteries. Platelet-shaped particles of 17 nm and 86 nm thickness were obtained, with the required composition and a structure close to the ideal 2D layered structure (less than 5.2% Ni2+ ions in Li+ sites). The electrochemical performances and surface reactivity of the materials were characterized in Li-ion batteries and compared to that of 280 nm particles with a more conventional morphology. Post-cycling analyses revealed a particular reactivity at high potential for the platelets compared to the conventional particles. X-Ray photoelectron spectroscopy and ex situ XRD analyses were performed to characterize the composition of the positive electrode/electrolyte interface and the structural changes undergone by the three materials upon cycling respectively. This study showed that, as well as the particles’ composition, their morphology plays a significant role regarding the reactivity and the structural changes occurring during cycling at high potential.

Mots clés: Li-ion battery; Layered oxide; NMC; morphology; reactivity; performances

Domaines: Matériaux

Adrien Soloy, Delphine Flahaut, Jean-Bernard Ledeuil, Joachim Allouche, Dominique Foix, et al.. Unravelling the morphological dependency of the LiNi0.6Mn0.2Co0.2O2 layered oxide reactivity in Li-ion batteries. ACS Applied Energy Materials, 2022, 5 (7), pp.8669-8685. ⟨10.1021/acsaem.2c01223⟩. ⟨hal-03684103⟩