| 摘要 |
PURPOSE: A surface-treated positive electrode active material for a lithium secondary battery and its preparation method are provided, to improve the charge/discharge characteristic, the lifetime, the high efficiency characteristic and the thermal stability of a battery. CONSTITUTION: The positive electrode active material is coated with at least one compound selected from the group consisting of oxides, hydroxides and oxyhydroxides of a material having high electronegativity; oxides, hydroxides and oxyhydroxides of an amphiphilic element; and oxides, hydroxides and oxyhydroxides of a basic element. Preferably the material having a high electronegativity is Co1-xMx, In1-xSnx, Al1-xNx or Li(CO1-xAlx, wherein M is Al, Zn, Mg, In, Sb, Bi or Mn, and 0<=x<=1.0); the amphiphilic element is Sb, Zn, In, Sn, Pb, B or Al; and the basic element is Co, Mg, Si, Zr, Mn, Bi or Ce. The method comprises the steps of adding a chelating agent to an aqueous solution of an element precursor and a positive electrode active material to prepare a mixture solution; dispersing the solution; and removing the solvent. |
