Evaluations of Discharge Capacity and Cycle Stability for a Graphene-added Li 1.9 Ni 0.35 Mn 0.65 O 2 Cathode Fabricated by using Carbonate Co-precipitation

Li-rich cathode materials are receiving considerable attention for use inlithium-ion batteries (LIBs) owing to their high capacity of more 250 mAh/g or higher in the voltage range of 3.0–4.5 V. However, due to the sharply fading capacity and poor rate-capability of Li-rich cathode materials, numerous efforts have been made to improve the rate-capability. In this research, Li-rich Li1.9Ni0.35Mn0.65O2 cathode materials were prepared via a carbonate coprecipitation route, and graphene, which provides high conductivity and thermal stability, was used during the slurry mixing process. The structures and microstructures of those cathode materials were confirmed using confirmed usnig X-ray diffraction (XRD) and scanning electron microscopy (SEM). The discharge capacity and capacity retention were enhanced owing to the high electric conductivity and thermal stability of graphene.