Patent ID: 10388954

Abstract:
An olivine-type positive active material for a lithium battery, a lithium battery having the olivine-type positive active material, and a method of manufacturing the olivine-type positive active material are provided. The olivine-type positive active material includes a plurality of particles represented by LixMyM′zXO4-wBw. M and M′ are independently an element selected from the group consisting of Fe, Ni, Co, Mn, Cr, Zr, Nb, Cu, V, Mo, Ti, Zn, Al, Ga, Mg, B, and the combination thereof, X is one element selected from the group consisting of P, As, Bi, Sb, and the combination thereof, B is one element selected from the group consisting of F, S, and the combination thereof, 0<x≤1, 0<y≤1, 0<z≤1, 0<x+y+z≤2, and 0≤w≤0.5. The particle is a secondary particle having a plurality of primary particles, a first carbon coating layer is on the surface of the primary particle and a second carbon coating layer is on the surface of the secondary particle, and carbon is dispersed inside the primary particle.