| 简介 |
PURPOSE : Provided are a method for preparing a positive electrode active material for a lithium secondary battery, and a positive electrode active material prepared by the method, to improve high temperature swelling characteristic by controlling the pH of a coating solution.
CONSTITUTION : The method comprises the steps of adding a first compound containing an element capable of forming a double bond with the oxygen of a lithium metal oxide and a second compound containing at least one element selected from the group consisting of an alkali metal, an alkaline earth metal, an element of groups 13 and 14, a transition metal and a rare earth element to a solvent to prepare an acidic coating solution having a pH of 0.01-3; adding a lithium-containing compound to the obtained acidic coating solution to coat the lithium-containing compound; and heating the coated lithium-containing compound to form a surface treated layer comprising represented by MXOk, wherein M is at least one element selected from the group consisting of an alkali metal, an alkaline earth metal, an element of groups 13 and 14, a transition metal and a rare earth element; X is an element capable of forming a double bond with oxygen; and k is an integer of 2-4. Preferably X is selected from the group consisting of P, S, W and their combination.
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