MULTI-COMPONENT-SYSTEM LITHIUM PHOSPHATE COMPOUND PARTICLES HAVING AN OLIVINE STRUCTURE, MANUFACTURING METHOD THEREOF AND LITHIUM SECONDARY BATTERY EMPLOYING THE LITHIUM PHOSPHATECOMPOUND PARTICLES AS A POSITIVE ELECTRODE MATERIAL

摘要

Multi-element lithium phosphate compound particles having an olivine structure, which are represented by the following general formula: LiYM11-ZM2ZPO4 (wherein M1 represents one metal element selected from a group consisting of Fe, Mn and Co; Y represents a number satisfying 0.9 = Y = 1.2; M2 represents at least one metal element other than M1 and selected from a group consisting of Mn, Co, Mg, Ti and Al; and Z represents a number satisfying 0 < Z = 0.1).  The multi-element lithium phosphate compound particles are characterized in that the concentration of the metal element M2 in the particle surface is higher than that in the particle center, and that the concentration of the metal element M2 is continuously decreased from the particle surface to the particle center.