LITHIUM-IRON PHOSPHATE, HAVING AN OLIVINE STRUCTURE, AND METHOD FOR PRODUCING IT

摘要

1. Phosphate of lithium-iron of the olivine type, consisting of secondary particles having an average particle diameter (D50) from 5 to 100 μm, formed by the aggregation of primary particles having an average particle diameter (D50) from 50 to 550 nm, in which the primary and the secondary particles have a composition represented by formula I below, and the secondary particles have a porosity of 15 to 40%: in which M is selected from Al, Mg, Ni, Co, Mn, Ti, Ga, Cu, V, Nb, Zr, Ce, In, Zn, Y, and combinations thereof; X is selected from F, S, N, and combinations thereof, with -0.5 а a + 0.50 x 0.5 and 0 b 0 0.1. 2. The olivine type lithium iron phosphate according to claim 1, wherein the primary particles each independently have an olivine type crystal structure. The olivine type lithium iron phosphate according to claim 1, wherein the primary particles are aggregated by physical bonds to form secondary particles. The olivine type lithium iron phosphate according to claim 1, wherein the pore size of the secondary particles is from 10 to 1000 nm. The olivine type lithium iron phosphate according to claim 1, wherein the primary particles have an average particle diameter (D50) of 100 to 300 nm, and the secondary particles have an average particle diameter (D50) of 5 to 40 μm. The olivine type lithium iron phosphate according to claim 1, wherein the secondary particles are spherical. The olivine-type lithium iron phosphate of claim 1, wherein the secondary particles have a specific surface area (BET) of 5 to 15 m / g. The olivine type lithium iron phosphate according to claim 1, wherein the olivine type lithium iron phosphate has a bulk density of 0.5 to 1.5 g / ml. The olivine type lithium iron phosphate according to claim 8, wherein the olivine type lithium iron phosphate has a bulk density of 0.8 to 1.3 g / ml. The olivine type lithium iron phosphate according to claim 1, wherein the lithium phosphate