A POWDEROUS LITHIUM COBALT-BASED OXIDE CATHODE ACTIVE MATERIAL POWDER FOR RECHARGEABLE LITHIUM ION BATTERIES AND A METHOD FOR MAKING THEREOF

A lithium cobalt-based oxide cathode active material powder having: —a primary phase comprising Li, Co, and O, and —a secondary phase comprising LiNaSO, wherein the content of said LiNaSOsecondary phase in said powder is of at least 0.4 wt. % and inferior or equal to 1.1 wt. % with respect to a total weight of the cathode active material powder, said cathode active material powder being characterized in that it has a S/Na atomic ratio superior or equal to 0.80 and inferior or equal to 1.20.