以铁泥为原料合成Fe_2O_3并制备LiFePO_4/C

Synthesis of Li Fe PO_4/C Using Fe_2O_3 Prepared from the Iron Sludge as Iron Source

采用溶解还原、沉淀、球磨、灼烧、稀HNO3处理等工艺过程,将铁泥中的Fe以Fe2O3的形式回收。以得到的Fe2O3为原料经过高温固相法合成Li Fe PO4/C作为锂离子电池的正极材料。分别研究了＂球磨＂和＂稀HNO3处理＂两个工艺步骤对产品性能的影响。XRD分析结果表明Li Fe PO4/C属橄榄石型晶系纯相。SEM图片显示Li Fe PO4/C颗粒均匀,尺寸分布在100-150 nm之间。通过电池充放电测试表征了Li Fe PO4/C的电化学性能,实验结果表明,由于采用优化的工艺过程制备的Fe2O3中适量保留了铁泥中的Co、Cr和Ni元素,所合成的Li Fe PO4/C表现出较好的循环稳定性和倍率性能。

Fe was recovered from the iron sludge in form of Fe203 via a method including dissolving, reducing, ball milling, precipitating, being treated with dilute HNO3 and calcining. LiFePO4/C was synthesized using the Fe2O3 as iron source. The influence of ball milling and treatment with dilute HNO3 on the performance of LiFePO4/C was investigated. XRD patterns show that the LiFePO4/C is single olivinetype phase and well crystallized. Particles of the LiFePO4/C with size ranging from 100 nm to 150 nm distribute homogeneously. Electrochemical performance is investigated with galvanostatic charge/discharge tests. The LiFePO4/C using Fe203 prepared via the optimal process as iron source shows good stability and rate performance due to the retention of Co, Cr and Ni.