Sylvain Franger

Comparison between different LiFePO4 synthesis routes and their influence on its physico-chemical properties

Abstract LiFePO4 powders were synthesized under several different conditions (solid state reactions at high temperatures, co-precipitation in aqueous medium, hydrothermal synthesis or mechanochemical activation). The samples were characterized by X-ray diffraction (XRD), chemical titration and their electrochemical performance were investigated in terms of cycling behavior. We also report, in this work, the benefit of introducing an electronic conductor precursor (typically a sucrose) during or after the synthesis in order to overcome the poor charge transfer associated with the lithium iron phosphate.

Optimized Lithium Iron Phosphate for High-Rate Electrochemical Applications

Structural and electrochemical properties of a new highly rechargeable lithium iron phosphate are described here, Its behavior as cathodic material was also tested in a complete power system based on a nanocrystalline Li 4 Ti 5 O 12 anode and a nonaqueous liquid electrolyte (1 mol L -1 LiPF 6 in ethylene carbonate/dimethyl carbonate). This cell operates with a very flat voltage profile at around 2 V, with very little capacity fading upon cycling, even at a very high rate (4C or 8C). These features, combined with the low cost and the lack of toxicity of the components, make this system an attractive and inexpensive power source for the low voltage electronic market.