Highly-ordered microstructure and well performance of LiNi0.6Mn0.2Co0.2O2 cathode material via the continuous microfluidic synthesis.

• NCM 622 cathode material was synthesized via a facile microfluidic reactor. • The material has well-developed layered structure, excellent elemental distribution, small size and uniform particles. • The structural stability and cycling performance of the cathode was improved. Ni-rich layered oxides are potential cathode candidate's materials for Li-ion batteries due to their low cost and high energy density. However, it is difficult to reproducibly prepare uniformly distributed element and well-controlled morphology of Ni-rich layered oxide particles. This study develops a continuous microfluidic reaction process to synthesize spherical carbonate precursors (Ni 0.6 Mn 0.2 Co 0.2 CO 3). The as-synthesized LiNi 0.6 Co 0.2 Mn 0.2 O 2 materials exhibit well-defined microsphere morphology, uniform particles size distribution, better thermal stability and homogeneous transition metal distribution, due to the excellent mixing, well mass and heat transfer rate during the microfluidic reaction. Moreover, the as-prepared LiNi 0.6 Co 0.2 Mn 0.2 O 2 materials achieve higher initial capacity, excellent electrochemical reversibility and capacity retention than that of the samples prepared by traditional co-precipitation. Therefore, our results demonstrate that microfluidic reaction is a simple and effective synthesis technology for preparing Ni-rich layered cathode. [ABSTRACT FROM AUTHOR]