POSITIVE ELECTRODE ACTIVE MATERIAL FOR A LITHIUM SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME

摘要

The present invention relates to a positive electrode active material having improved thermal stability for a lithium secondary battery, to a method for producing the positive electrode active material, and to a lithium secondary battery comprising the material. The positive electrode active material may be expressed in the following chemical formula 1, and may contain particles, the mean diameter of which is 200 nm to 1 µm, wherein the surfaces of the particles are coated with a uniform carbon coating layer. [Chemical formula 1]: LiaMn1-xMxPO4 (where, M is any one or a mixture of any two or more elements selected from among Mg, Fe, Co, Cr, Ti, Ni, Cu, Zn, Zr, Nb and Mo, and where a satisfies 0.9 = a = 1.1 and x satisfies 0 = x < 0.5).