Electrochemical characterization of voltage fade of Li1.2Ni0.2Mn0.6O2 cathode

Li- and Mn-rich composite cathodes, such as Li1.2Ni0.2Mn0.6O2 are attractive for electrified transportations. However, this type of materials suffers from a voltage decay during cycling, which makes it unpractical in real applications. For a better characterization and understanding of the voltage fade phenomenon, the average voltage and average quasi-OCP were measured to estimate the voltage decay rate. As a possible solution, atomic-layer-deposition (ALD) Al2O3 coatings were applied to the powder to stabilize the material's surface. The voltage fade of the ALD-coated sample was also evaluated.