Due to the advantages of high specific capacity, various temperatures, and low cost, layered LiNi_0.6Co_0.2Mn_0.2O₂ has become one of the potential cathode materials for lithium-ion battery. However, its application was limited by the high cation mixing degree and poor electric conductivity. In this paper, the influences of synthesis methods and modification such surface coating and doping materials on the electrochemical properties such as capacity, cycle stability, rate capability, and impedance of LiNi_0.6Co_0.2Mn_0.2O₂ cathode materials are reviewed and discussed. The confronting issues of LiNi_0.6Co_0.2Mn_0.2O₂ cathode materials have been pointed out, and the future development of its application is also prospected.