Effect of CO2 on Layered Li1+zNi1-x-yCoxMyO2 (M=Al,Mn) Cathode Materials

We investigated the effect of CO2 on Li1+zNi1-x-yCoxMyO2 (M = Al, Mn) cathode materials which were synthesized by spray drying method. The change of CO2 absorptivity associated with composition were closely related the electrochemical performance. CO2 absorptivity was very high for Li1.04Ni0.80Co0.15Al0.05O2 and very low for Li1.02Ni0.33Co0.33Mn0.33O2. In Li1.04Ni0.80Co0.15Al0.05O2, XRD and SEM indicated the surface of CO2 exposure sample was covered with Li2CO3 film. In Li1+zNi1-x-yCoxMyO2 (M = Al, Mn), Ni3+ content obviously correlates with the carbonate ion content, indicating that the reactivity of cathode material with CO2 depends on Ni3+ content.