Residual Li Compounds-Selective Washing Process for Ni-Rich Layered Oxide Cathode Materials for Li-Ion Batteries

The industrial manufacturing process for Ni-rich layered oxides for Li-ion batteries includes a washing step to remove residual Li compounds, such as LiOH and Li 2 CO 3, from the oxide surface. However, Ni-rich layered oxides are deformed during a conventional water-based washing process, leading to the degradation of the oxide surface. In this regard, a significant challenge for Ni-rich layered oxides is to remove residual Li compounds without surface damage during a washing process. Herein, the residual Li compounds-selective washing process is introduced as a promising strategy for LiNi 0.945 Co 0.04 Al 0.015 O 2 to suppress the degradation of the oxide surface during washing. The selectively hydrophobic LiNi 0.945 Co 0.04 Al 0.015 O 2 powders are obtained through selective coating only on the LiNi 0.945 Co 0.04 Al 0.015 O 2 surface with hydrophobic polydimethylsiloxane, leaving resid…