Low Temperature Aqueous Precipitation Synthesis of LiMnPO4 Nano Particles for Li Ion Battery Cathodes
Here, we describe an optimized LMP low temperature (100°C) aqueous precipitation synthesis method2, resulting in nanoparticles (NP), with typical sizes of 50-200 nm, of which the reaction time could be significantly reduced, by modifying the base, used for inducing the precipitation. By an in-depth study of several synthesis parameters such as the flow rate, reaction time, temperature, base, … the complexity of this thermodynamically and even kinetically fragile system is emphasized. Our results show that phase pure LMP NP are only obtained in a particular small subset of these parameter values. Outside this range, secondary phases (like Li3PO4, MnHPO4 hydrate and Mn5(HPO4)2(PO4)2.4H2O (hureaulite)) are formed, or LMP is even completely absent.
The figure shows a TEM image of the LMP NP as synthesized after 24 hours at 100°C.
T. Vranken is a Ph.D. fellow of the Research Foundation – Flanders (FWO).
(1) Wang, H.; Yang, Y.; Liang, Y.; Cui, L.-F.; Casalongue, H. S.; Li, Y.; Hong, G.; Cui, Y.; Dai, H. Angew. Chemie Int. Ed. 2011, 50, 7364–7368.