MULTI-ELEMENT LITHIUM PHOSPHATE COMPOUND PARTICLES HAVING OLIVINE STRUCTURE, METHOD FOR PRODUCING SAME, AND LITHIUM SECONDARY BATTERY USING SAME IN POSITIVE ELECTRODE MATERIAL

摘要

There is disclosed a multi-component system lithium phosphate compound particles having an olivine structure and represented by a general formula of Li Y M1 1-Z M2 Z PO 4 in which M1 is one metal element selected from the group consisting of Fe, Mn and Co, Y is a number satisfying a formula of 0.9 ‰¤ Y ‰¤ 1.2, M2 is at least one metal element selected from the group consisting of Mn, Co, Mg, Ti and Al, and Z is an number satisfying a formula of 0 < Z ‰¤0.1, wherein a concentration of the metal element M2 existing on a surface of the particle is higher than the concentration of that existing in core portion of the particle and that the concentration of the metal element M2 is continuously lowered from the surface of particle to a core portion of the particle.