Lithium-active molybdenum trioxide coated LiNi_0.5Co _0.2Mn_0.3O₂ cathode material with enhanced electrochemical properties for lithium-ion batteries

LiNi_0.5Co_0.2Mn_0.3O₂ cathode material was coated with MoO₃ via a wet coating process. X-ray diffraction patterns show that the coating surface is composed of MoO ₃ and Li₂MoO₄. The 3 wt.% MoO₃ coated LiNi_0.5Co_0.2Mn_0.3O₂ cathode (Li₂MoO₄ is treated as equivalent mole of MoO₃) exhibits the best improved cycling performance. It performs a capacity retention of 90.9% after 100 cycles while that of the pristine material is only 82.8%. After being coated by 3 wt.% MoO₃, the rate performance is also greatly enhanced and the charge transfer resistance is greatly decreased. The improvement of electrochemical performance is related to the fact that the coating layer diminishes the side reactions between the cathode and the electrolyte.