The surface of LiNi0.6Mn0.2Co0.2O2 particles and current collector was modified with Cr2O3, and NaOH solution, respectively and the electrochemical performance of NMC622 as a cathode material of Li-ion battery was investigated. The contact angle test shows the more wettability of the modified Al foil, confirming the better adhesion of cathode material slurry on that. The cellfig with a modified current collector has more capacity (176.6 mAh g-1 at 0.1C) at the first cycle and better cyclic performance (capacity loss of 12.8% after 50 cycles) than the cell with the unmodified current collector (172.3 mAh g-1 at 0.1C, and capacity loss of 17% after 50 cycles). Moreover, modifying the surface of NMC622 particles as a cathode active material with 0.5 wt% of Cr2O3 and surface treatment of the current collector leads to a high capacity (179.8 mAh g-1 at 0.1C ) and improved cyclic stability; capacity loss of 9.1% after 50 cycles.

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