Washing effects on electrochemical performance and storage characteristics of LiNi0.8Co0.1Mn0.1O2 as cathode material for lithium-ion batteries

► The effect of water washing on fresh LiNi0.8Co0.1Mn0.1O2 cathode was firstly studied. ► Water washing improved the cycling performance and structural stability of material. ► Water washing resulted in a slight deleterious effect on the capacity. ► Water washing made material much less resistant to H2O and CO2 when storing in air.