One-pot facile co-precipitation synthesis of the layered Li1+x(Mn0.6Ni0.2Co0.2)1-xO2 as cathode materials with outstanding performance for lithium-ion batteries

The Li-rich layered Li1 + x(Mn0.6Ni0.2Co0.2)1 − xO2 (x = 0.14, 0.165, 0.19) cathode materials have been successfully synthesized through a one-pot facile co-precipitation route. The synthesized MCO3 (M = Mn0.6Ni0.2Co0.2) precursor mixing with Li2CO3 was annealed at 500 °C and calcinated at 900 °C. The morphology and structure of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that the sample Li1.165Mn0.501Ni0.167Co0.167O2 (x = 0.165) exhibits the most outstanding electrochemical performance, which may be ascribed to uniform particle size and high crystallinity. It delivers an initial discharge-specific capacity of approximately 241.7 mAh g−1 with an initial coulombic efficiency of 70.3 % at a constant density of 25 mA g−1. A reversible discharge-specific capacity of approximately 207.2 mAh g−1 is still obtained after 100 cycles. The discharge capacities of nearly 226.8, 194.4, 158.9, 143.7, 116.8, 97.5, and 47.6 mAh g−1 can also be attained under 0.1 C, 0.2 C, 0.5 C, 1 C, 2 C, 5 C, and 10 C (1 C = 250 mA g−1), respectively. The Li-rich layered Li1.165Mn0.501Ni0.167Co0.167O2 will be a promising cathode material for advanced lithium-ion batteries.