文摘
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.