以铁泥为原料合成Fe2O3并制备LiFePO4/C

摘要采用溶解还原、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LiFePO₄/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LiFePO₄/C属橄榄石型晶系纯相。SEM图片显示LiFePO₄/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LiFePO₄/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LiFePO₄/C表现出较好的循环稳定性和倍率性能。

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关键词：锂离子电池; 磷酸铁锂; Fe₂O₃; 铁泥回用

Abstract： Fe was recovered from the iron sludge in form of Fe₂O₃ 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 olivine-type 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 Fe₂O₃ prepared via the optimal process as iron source shows good stability and rate performance due to the retention of Co, Cr and Ni.

Keywords： lithium ion battery; lithium iron phosphate; Fe₂O₃; iron sludge

Received 2013-05-02;

Fund:

国家973项目(2009CB220105)。

Corresponding Authors: 田建华,电话:(022)27890885,E-mail:jhtian@tju.edu.cn。 Email: jhtian@tju.edu.cn

About author: 常小龙(1988-),男,硕士,现从事锂离子电池正极材料研究。

引用本文:

常小龙, 田建华, 单忠强.以铁泥为原料合成Fe₂O₃并制备LiFePO₄/C[J]. 化学工业与工程, 2015,32(1): 6-10

Chang Xiaolong, Tian Jianhua, Shan Zhongqiang.Synthesis of LiFePO₄/C Using Fe₂O₃Prepared from the Iron Sludge as Iron Source[J]. Chemcial Industry and Engineering, 2015,32(1): 6-10

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