Improving Electrochemical Performance of NMC622 Cathode by Coating with Cr2O3 Nanopowders and Modified Current Collector

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 cell 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.

Automated summary

The surface modification of LiNi0.6Mn0.2Co0.2O2 particles and current collector improves the electrochemical performance of NMC622 as a cathode material of Li-ion battery, including better wettability, higher capacity, and improved cyclic stability.