Patent ID: 8734676
Filing Date: 2014-05-27
Classification: C01B,H01M,Y02E,Y02P

Abstract:
1. Lithium iron phosphate having an olivine crystal structure, wherein the lithium iron phosphate has a composition represented by the following Formula 1 and carbon (C) is coated on the particle surface of the lithium iron phosphate containing a predetermined amount of sulfur (S): wherein M is at least one selected from Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn and Y, X is at least one selected front F, S and N, and 0.5≦a≦+0.5, 0≦x≦0.5, 0≦b≦0.1 wherein the sulfur (S) is contained at an amount of 0.05 to 5% by weight, based on the total weight of the lithium iron phosphate wherein the sulfur and the carbon are present in the form of a structure selected from the group consisting of (i) a structure in which carbon is coated on the surface of lithium iron phosphate particles in a state in which a predetermined amount of sulfur is contained on the surface of lithium iron phosphate particles, (ii) a structure in which both sulfur and carbon are coated on the surface of lithium iron phosphate particles, (iii) a structure in which a composite of sulfur and carbon is coated on the surface of lithium iron phosphate particles, (iv) a structure in which carbon is bonded through sulfur to lithium iron phosphate particles, and combinations thereof.