MONOCRYSTALLINE POSITIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREOF AND LITHIUM-ION BATTERY

Provided are a monocrystalline positive electrode material, a preparation method thereof and a lithium-ion battery. The monocrystalline positive electrode material is a particulate matter, including an inner layer material and a coating layer coated on the surface of the inner layer material; where the particulate matter includes first particles having an average particle diameter Fof 1.0-2.0 μm and second particles having an average particle diameter Fof 2.5-6.0 μm, and the average thickness Tof the coating layer of the first particles is less than the average thickness Tof the coating layer of the second particles; and the coating layer includes a fast ion conductor.