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Environmentally Friendly Synthesis of LiFePO4 Using Fe–P Waste Slag and Greenhouse Gas CO2

Cui, Qian, Luo, Chunhui, Li, Gen, Wang, Guixin, Yan, Kangping
Industrial & Engineering Chemistry Research 2016 v.55 no.26 pp. 7069-7075
carbon dioxide, greenhouse gases, thermogravimetry, X-ray diffraction, energy, slags, chemical reactions, manufacturing, electrochemistry, carbon, phosphoric acid, reaction mechanisms, industrial wastes, spectral analysis, phosphorus, calorimetry
An environmentally friendly and feasible route was creatively put forward to synthesize LiFePO₄ using two industrial wastes, Fe–P and CO₂ from yellow phosphorus manufacture. LiFePO₄ was obtained via a one-step synthesis in which the mixture of Fe₁.₅P, Li₂CO₃, and H₃PO₄ in an appropriate molar ratio was calcined at 800 °C for 6 h in CO₂. The chemical reaction mechanism was investigated by thermogravimetric and differential scanning calorimetric analysis and X-ray diffraction measurements; thereby, the appropriate synthesis conditions were determined. The electrochemical performances of the synthesized LiFePO₄ coated with 5.3 wt % carbon were characterized by charge–discharge tests, cyclic voltammetric experiments, and electrochemical impedance spectroscopic measurements, which indicate high capacity, good cyclic capability, and low impedance. Fe–P waste slag and the greenhouse gas CO₂ are successfully converted into the energy materials in this work, which improves the traditional two-step synthesis route and provides a new route of LiFePO₄ production.