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

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• 作者：Qian Cui ; Chunhui Luo ; Gen Li ; Guixin Wang ; Kangping Yan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：55
• 期：26
• 页码：7069-7075
• 全文大小：499K
• 年卷期：0
• ISSN：1520-5045

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 Fe_1.5P, 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.