Improved electrochemical performance for high voltage spinel LiNi0.5Mn1.5O4 modified by supercritical fluid chemical deposition

Gwenaëlle Courbaron (1, 2) , Emmanuel Petit (1, 3) , Jon Serrano-Sevillano (1, 4, 5) , Christine Labrugère-Sarroste (6) , Jacob Olchowka (1, 3, 4) , Dany Carlier (1, 3, 4) , Nathalie Delpuech (2, 3, 4) , Cyril Aymonier (1, 3) , Laurence Croguennec (1, 3, 4)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Technocentre, Renault SAS
3 RS2E - Réseau sur le stockage électrochimique de l'énergie
4 ALISTORE-ERI - Advanced Lithium Energy Storage Systems - ALISTORE-ERI
5 CIC ENERGIGUNE - Parque Tecnol Alava
6 PLACAMAT - Plateforme Aquitaine de Caractérisation des Matériaux

Among candidates at the positive electrode of the next generation of Li-ion technology and even beyond post Li-ion technology as all-solid-state batteries, spinel LiNi0.5Mn1.5O4 (LNMO) is one of the favorites. Nevertheless, before its integration into commercial systems, challenges still remain to be tackled, especially the stabilization of interfaces with the electrolyte (liquid or solid) at high voltage. In this work, a simple, fast, and cheap process is used to prepare a homogeneous coating of Al2O3 type to modify the surface of the spinel LNMO: the supercritical fluid chemical deposition (SFCD) route. This process is, to the best of our knowledge, used for the first time in the battery field. Significantly improved performance was demonstrated vs those of bare LNMO, especially at high rates and for highly loaded electrodes.

Mots clés: Lithium-ion batteries; Surface modification; High-voltage positive electrode material; Spinel oxide LiNi0.5Mn1.5O4; Supercritical fluid chemical deposition

Domaines: Matériaux

Gwenaëlle Courbaron, Emmanuel Petit, Jon Serrano-Sevillano, Christine Labrugère-Sarroste, Jacob Olchowka, et al.. Improved electrochemical performance for high voltage spinel LiNi0.5Mn1.5O4 modified by supercritical fluid chemical deposition. ACS Applied Materials & Interfaces, 2023, 15 (2), pp.2812-2824. ⟨10.1021/acsami.2c14777⟩. ⟨hal-03947373⟩