Continuous Supercritical Hydrothermal Synthesis of Lithium Iron Phosphate (LiFePO4) Nanoparticles and Their Electrochemical Properties
- Continuous Supercritical Hydrothermal Synthesis of Lithium Iron Phosphate (LiFePO4) Nanoparticles and Their Electrochemical Properties
- Issue Date
- 2011 MRS Spring meeting
- In a typical supercritical hydrothermal synthesis (SHS) process, aqueous precursor solution at room temperature and supercritical water are directly mixed at short reaction time under high temperature and pressure conditions. The flow at the mixing tee has a significant effect on nucleation and growth during SHS. In this study, continuous supercritical hydrothermal synthesis (SHS) is used to synthesis nanosize lithium iron phosphate (LiFePO4) particles using various mixing tees including a 90 degree tee, a 50 degree tee, and a swirling-type tee. The LiFePO4 particles were characterized in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer, Emmet, and Teller (BET) analysis, thermal gravimetric analysis (TGA), and charge-discharge testing. The flow behaviors at each mixing tee are simulated using CFD. Depending on the mixing tee, particle size, crystallinity, morphology, and electrochemical properties of synthesized LiFePO4 are different. When the swirling-type mixing is used, as-synthesized LiFePO4 delivers reversible capacity of ~ 90 mAh/g at a current density of 0.1 C without carbon coating while almost no capacity decay at ~ 152 mAh/g is observed during the 30 cycles in carbon-coated LiFePO4.
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