A lithium metal oxide powder for use as a cathode material in a rechargeable battery, consisting of a core material and a surface layer, the core having a layered crystal structure consisting of the elements Li, a metal M and oxygen, wherein the Li content is stoichiometrically controlled, wherein the metal M has the formula M\u2550Co1-aM\u2032a, with O\u2266a\u22660. A ball distribution device is located within the second chamber and functions to sort all spherical members according to their size and color. In the first initialization period, scanning of a plurality of signals and weighting of a holding period of each signal are performed. The second end has at least one mounting slot and at least one first opening in communication with the mounting slot.