Patent ID: 8841023

Claim:
A multi component system lithium phosphate compound particle having an olivine structure and represented by a 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 a number satisfying a formula of 0≦Z≦0.1, wherein a concentration of the metal element M2 contained in a surface of the particle is higher than the concentration of the metal element M2 contained in a core portion of the particle, and the concentration of the metal element M2 is continuously lowered from the surface of particle to a core portion of the particle.