Author: Elise Ramleth Østli
Title: Surface coated LiNi0.5Mn1.5O4 as a high-voltage cathode material for Li-ion batteries
Affiliation: Norwegian University of Science and Technology
Abstract
LiNi0.5Mn1.5O4 (LNMO) is a promising cathode material for Li-ion batteries (LIBs) due to its high operating voltage, and its environmental and economic advantages compared to other cathode materials. Commercialization of LNMO is however hindered by the unstable cathode/electrolyte interface that leads to transition metal ion dissolution and a reduced battery life. The stabilizing effect of protective surface coatings, such as Al2O3, TiO2, and ZnO, have previously been reported. However, several of these studies have performed electrochemical characterization in half-cell configuration, thus losing important information of degradation effects that can be hidden by the unlimited Li supply. In this study, we investigate LNMO coated with TiO2 by atomic layer deposition (ALD). We perform electrochemical characterization in full-cell configuration with a graphite anode and, combined with post-mortem analysis, we determine the stabilizing effect of TiO2 on the cathode/electrolyte interface