LITHIUM IRON PHOSPHATE INCLUDING SULFUR COMPOUNDS WITH SULFIDE BOND AND LITHIUM SECONDARY BATTERY USING THE SAME

Disclosed is lithium iron phosphate having an olivine crystal structure, wherein the lithium iron phosphate has a composition represented by the following Formula 1, a sulfur compound with a sulfide bond is contained, as an impurity, in the lithium iron phosphate particles, and carbon (C) is coated on particle surfaces of the lithium iron phosphate: LiFeM(PO)X (1) (wherein M, X, a, x, and b are the same as defined in the specification).