The effects of reheating process on the electrochemical properties of single crystal LiNi0.6Mn0.2Co0.2O2

Single crystal primary LiNi0.6Mn0.2Co0.2O2 cathode materials were successfully synthesized via a developed ball milled route and followed by a proper reheating process. The influences of ball milling and reheating processes on the structure and electrochemical properties of LiNi0.6Mn0.2Co0.2O2 cathode material were investigated by X-Ray diffraction, scanning electron microscope, high resolution transmission electron microscopy, selected area electron diffraction, cyclic voltammetry, electrochemical impedance spectroscopy and electrochemial tests. The results showed that the reheating process was the key to obtain fine single crystal particles with excellent electrochemical properties. The single crystal primary LiNi0.6Mn0.2Co0.2O2 exhibited a discharge capacity of 179.7 mAh g−1 at 1.0C, and sightly decreased to 173.4 mAh g−1 after 50 cycles, with the excellent capacity retention of 96.5%. The low increases of resistance and high lithium ions diffusion coefficient all illustrated the single crystal particles had good lithium ion kinetic properties.