Abstract
The Ni-rich NCM622 is a promising cathode material for future high energy lithium ion batteries, but unstable electrochemical performance of NCM622 hinder its large scale commercial application. The cycling peformance of nickel-rich LiNi(0.6)Co(0.2)Mn(0.2)O(2) (NCM622) cathode materials can be improved by surface coating. Here, a one-step approach based on TiF(4) is used to successfully manufacture modified NCM622 cathode materials with a TiO(2)-LiF coating. The TiO(2)-LiF coated NCM622 preserves 79.7% capacity retention which is higher than the pure NCM622 (68.9%) at 1C after 200 cycles within 2.7-4.3 V. This material serves as the cathode for lithium-ion batteries (LIBs). The uniform TiO(2)-LiF coating layer can alleviate structural degradation brought on by unfavorable side reactions with the electrolyte has been validated. TiO(2)-LiF coated on NCM622 cathode materials can be modified easily by one-step approach.