Abstract: On the basis of the superiority in capacity and cost of high nickel ternary cathode materials, the high nickel LiNi_0.8Co_0.1Mn_0.1O₂ materials with large size single crystal particles were prepared by gradient calcination and high temperature solid-state method. The newly-manufactured material is compared with the materials prepared by traditional solid state reaction calcination. XRD diffraction shows the structural characteristics, reflecting the mixed discharge degree of cations. Scanning electron microscope and transmission electron microscope were used to characterize the surface morphology and crystal characteristics. The results of cyclic voltammetry high magnification testing testify the obvious advantages of cyclic stability and capacity retention, which is in line with the safe and stable conditions faced by lithium-ion battery in the rapid development process in recent years. The NCM-811 material prepared by molten salt method provides a new idea for preparing micron-sized single crystal cathode materials.