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Influence of atomization conditions on spray drying Lithium Iron Phosphate nanoparticle suspensions

Abstract

Removing solvents from nanoparticle solid suspensions requires the same diligence as drying pharmaceutical ingredients. LiFePO4 nanoparticles suspension in water oxidize, sinter, and Li3PO4 segregates on the surface when they dry in a furnace. Spray drying preserves the material properties because contact times are on the orders of seconds; furthermore, the atomized droplets ensure particles are small (5µm to 20 µm) and dispersed. A Yamato GA‐32 (120 mm inner diameter) spray dried in co‐current flow a nanoparticle suspension of LiFePO4 in water, with a solid content up to 60%. Atomization gas velocities of 140 ms−1 to 350 ms−1 agglomerated the nanomaterial into spherical particles that ranged from 3 µm to 10 µm. The particle diameters ranged from 10 µm to 20 µm at atomization velocities of 50 ms−1 to 140 ms−1. At this condition, yield was lower because the semi‐dried particles adhere on the wall. At (150°C to 200°C) the surface area reached 26 m2g−1while from (50°C to 100°C) it varied from 14 m2g1 to 20 m2g−1. The trend for mesoporosity versus spray drying temperature is the same as for surface area: pore volumes are higher (0.18 cm3g−1) above 200°C and 20% lower below 200°C. Drying temperature modifies drying speed; low temperatures compact the powders more than high temperature which results in lower surface area and porosity. This article is protected by copyright. All rights reserved

Authors:   Marco G. Rigamonti, Yu‐Xiang Song, He Li, Nooshin Saadatkhah, Pierre Sauriol, Gregory S. Patience
Journal:   The Canadian Journal of Chemical Engineering
Year:   2017
Pages:   n/a
DOI:   10.1002/cjce.23106
Publication date:   18-Dec-2017
Facts, background information, dossiers
  • Lithium Iron Phosphate
  • gas
  • flow
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