Cathode material, method of preparing it and non-aqueous solvent type secondary battery having a cathode comprising it

摘要

A cathode material for a lithium ion secondary battery, especially of the non-aqueous solvent type, comprises a compound of the formula Li1-X-aAXNi1-Y-bBYO2. wherein: A is at least one alkaline earth metal component and may be selected. from (1) at least two of magnesium, calcium, strontium and barium, (2) strontium alone and (3) barium alone; B is at least one transition metal element other than Ni; X is the total number of moles of A and if A consists of more than one alkaline earth metal element, then X is the total number of moles of all alkaline earth metal elements; Y is the total number of moles of B and if B consists of more than one transition metal element, then Y is the total number of moles of all transition metal elements; and X, Y, a and b satisfy the respective equations: $$ $ $ A\; method\; of\; preparing\; the\; cathode\; material\; comprises\; the\; steps\; of:\; mixing\; a\; starting\; compound\; containing\; lithium\; and\; A\; with\; a\; starting\; compound\; containing\; nickel\; and\; B;\; heating\; the\; mixture\; in\; an\; oxidizing\; atmosphere.$$$$