Lithium transition metal phosphate secondary agglomerates and process for its manufacture
A Lithium-transition-metal-phosphate compound of formula Li 0.9+x Fe 1-y M y PO 4 ) in the form of secondary particles made of agglomerates of spherical primary particles wherein the primary particles have a size in the range of 0.02-2 pm and the secondary particles a mean size in the range of 10-40 pm and a BET surface of 16-40 m 2 /g, a process for its manufacture and the use thereof.
1. A lithium-transition-metal-phosphate compound of formula Li 0.9+x Fe 1-y M y (PO 4 ) with x≤0.3 and 0≤y≤1 and M is a metal or semimetal or mixtures thereof in the form of secondary particles made of agglomerates of spherical primary particles,
wherein the primary particles have a size in the range of 0.02-2 μm and
the secondary particles have a mean size (d 50 ) of 5-40 μm and a BET surface of 16-40 m 2 /g and
wherein the lithium-transition-metal-phosphate compound has a tap density of 1250-1600 g/l.
2. A lithium-transition-metal-phosphate compound of formula Li 0.9+x Fe 1-y M y (PO 4 ) with x≤0.3 and 0≤y≤1 and M is a metal or semimetal or mixtures thereof in the form of secondary particles made of agglomerates of spherical primary particles,
wherein the primary particles have a size in the range of 0.02-2 μm,
wherein the secondary particles have a mean size (d 50 ) of 5-40 μm and a BET surface of 16-40 m 2 /g,
wherein the lithium-transition-metal-phosphate compound has a tap density of 1250-1600 g/l and,
wherein the lithium-transition-metal phosphate compound has a bulk porosity of 65-80%.
3. The lithium-transition-metal-phosphate compound according to claim 1 with a tap porosity of 55-65%.
4. The lithium-transition-metal-phosphate compound according to claim 1 with a bulk density of 750-1250 g/l.
5. The lithium-transition-metal-phosphate compound according to claim 1 with a press density of 2000-2800 g/l.
6. The lithium-transition-metal-phosphate compound according to claim 1 which is LiFePO 4 , LiMnPO 4 or Li 0.9+x Fe 1-y Mn y PO 4 .
7. The lithium-transition-metal-phosphate compound according to claim 1 , wherein the primary particles have a conductive carbon deposit on at least a part of the surface of the primary particles.
8. The lithium-transition-metal-phosphate compound according to claim 2 with a tap porosity of 55-65%.
9. The lithium-transition-metal-phosphate compound according to claim 2 which is LiFePO 4 , LiMnPO 4 or Li 0.9+x Fe 1-y Mn y PO 4 .
10. The lithium-transition-metal-phosphate compound according to claim 2 , wherein the primary particles have a conductive carbon deposit on at least a part of the surface of the primary particles.