Ultrathin-Y2O3-coated LiNi0.8Co0.1Mn0.1O2 as cathode materials for Li-ion batteries: Synthesis, performance and reversibility

Abstract

Nickel-rich lithium material LiNixCoyMn1-x-yO2(x > 0.6) becomes a new research focus for the next-generation lithium-ion batteries owing to their high operating voltage and high reversible capacity. However, the rate performance and cycling stability of these cathode materials are not satisfactory. Inspired by the characteristics of Y2O3 production, a new cathode material with ultrathin-Y2O3 coating was introduced to improve the electrochemical performance and storage properties of LiNi0.8Co0.1Mn0.1O2 for the first time. XRD, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive spectroscopy (EDS) and XPS were used to mirror the crystal and surface of LiNi0.8Co0.1Mn0.1O2 particles, results i that a uniform interface formed on as-prepared material. The impacts on the electrochemical properties with or without Y2O3 coating are discussed in detail. Notably, galvanostatic discharge-charge tests appear that Y2O3-coated sample especially 3% coating displayed a better capacity retention rate of 91.45% after 100 cycles than the bare one of 85.07%.