Abstract
This investigation is a contribution to the research on alternative cathode materials with much more promising performances for lithium batteries. It deals with the electrochemical properties of iron phosphate compound FePO4, chemically prepared through the so-called sol–gel Pechini process, terminated by a calcination of the product precursor at temperatures (T c) ranging between 350°C and 650°C. A crystalline phase was obtained for temperatures ≥400°C. The particle size decreased with the decrease in T c, giving rise to a Brunauer–Emmett–Teller (BET)-specific surface area, S BET, as high as 28 m2 g−1 for the sample annealed at 400°C. The electrochemical properties of FePO4-based composite cathodes were characterized on three-electrode laboratory cells. Charge–discharge cycling determined a maximum reversible capacity of 132 mAh g−1, which fell with the increase in T c. A direct correlation was established between the activity of the material and its active surface area.
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Kahoul, A., Hammouche, A. Electrochemical performances of FePO4-positive active mass prepared through a new sol–gel method. Ionics 16, 105–109 (2010). https://doi.org/10.1007/s11581-009-0371-z
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DOI: https://doi.org/10.1007/s11581-009-0371-z