The positive electrode active material and its production method and its use for a rechargeable lithium battery

Abstract: also charged and discharged at a high temperature cycle property and storage stability good and high capacity, lithium for a lithium battery positive electrode can be configured lithium secondary battery having a high output - providing a transition metal-based halogenated oxide to. A general formula (Wherein, M is V, Cr, Fe, Co, at least one or more substituted metal element selected from Ni, X is at least one kind of halogen element.) X Depth to attenuate to 0 percent, 0.3 to 50 from the outermost surface An inclined structure such that nm, and the atomic ratio of the total halogen content and the total content of metallic elements other than lithium in the positive electrode active material X / (Mn + Mg + M) is from 0.002 to 0. Cathode active material for a lithium secondary battery which is 15.