Understanding the Stabilizing Effects of Nanoscale Coatings on Lithium-Ion Battery Positive Electrode Materials (NMC811)

High energy density and improved safety combined with long cycle life are crucial goals for the development of the more environmentally being next generation lithium batteries (LIBs). Layered lithium nickel manganese cobalt oxides (NMC811) are one of the most promising positive electrode materials due to their high capacity and low cost. However, the structural instability of NMC811 seriously restricts the battery performance and decreases lifetime. To improve NMC811 performance, a thin protective coating can be used on the electrode for stabilizing NMC811 at high voltages. We have synthesized a novel coating on the surface of a NMC811 electrode which enhances the structural and chemical stability even at high working potentials, and consequently protect the cathode capacity. Synchrotron X-ray tomography will be in a key role to investigate the role of the coating against the parasitic reactions, and crack formation, for developing NMC811 enhancement.