| 摘要 |
PURPOSE: A lithium secondary battery is provided to offer high capacity, charging density, electrochemical property, and excellent lifetime property of a positive electrode active material having a core-shell two layer structure. CONSTITUTION: A production method of a composite metal oxide which is a precursor for a positive electrode active material for a lithium secondary battery comprises the following steps: selecting three kinds of compounds from nickel, cobalt, iron, manganese, and aluminum to produce a metal solution; adding a precipitation agent and a carrier to the metal solution, inserting the mixture into a continuous reactor for stirring and obtaining a core unit; mixing the core unit with a transition metal mixed aqueous solution, the precipitation agent, and the carrier to form a transition metal oxide layer on the surface of the core unit as a shell; and filtering, washing, and drying to obtain the precursor. The positive electrode active material has a core-shell two layer structure. The precipitation agent is sodium carbonate, and the carrier is an ammonia solution. |
