Improved Electrochemical Performance for High-Voltage Spinel LiNiMnO Modified by Supercritical Fluid Chemical Deposition.

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 LiNiMnO (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 AlO type to modify the surface of the spinel LNMO: the supercritical fluid chemical deposition (SFCD) route.