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均匀沉淀法制备LiFePO_4/C及其电化学性能 被引量：7

Synthesis and electrochemical performance of LiFePO_4/C by homogeneous precipitation method
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摘要 以FeSO4·7H2O、H3PO4、H2O2和尿素为原料,采用均匀沉淀法制备LiFePO4的前驱体FePO4·xH2O,研究表面活性剂PEG对前驱体FePO4·xH2O形貌的影响。并将获得的FePO4·xH2O与Li2CO3及葡萄糖混合后合成LiFePO4/C。利用XRD、SEM、循环伏安测试、电化学性能测试、交流阻抗测试等手段对LiFePO4/C进行表征。结果表明:当不添加表面活性剂PEG时,FePO4·xH2O颗粒呈球形,但团聚现象严重;添加PEG后,颗粒较分散,形貌为多面体,合成的LiFePO4/C在0.1C时的首次放电比容量为151.0 mA·h/g,倍率性能好,振实密度达1.44 g/cm3。 FePO4·xH2O precursor was synthesized by the homogenous precipitation method from FeSO4·7H20, H3PO4, H202 arid urea. The influence of surfactant PEG on the morphology of FePOa·xH20 was studied. The LiFePO4/C composites were synthesized with the as-prepared FePO4·xH2O, LizCO3 and glucose as raw materials. The performance of LiFePO4/C was characterized by XRD, SEM, cyclic voltammograms （CV）, electrochemical performance and electrochemical impedance spectroscopy （EIS） tests. The results show that FePO4·xH2O synthesized without surfactant PEG has spherical shape, but serious reunion phenomenon. The particles of FePO4·xH2O synthesized with surfactant PEG disperse well and have polyhedron shape, the discharge specific capacity of LiFePO4/C is 151 mA.h/g at 0.1C, showing good rate performance. The tap density reaches 1.44 g/cm3.
作者 彭忠东 唐代春 胡国荣 杜柯 曹雁冰
机构地区 中南大学冶金科学与工程学院
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2012年第5期1319-1325,共7页 The Chinese Journal of Nonferrous Metals
基金 国家"十一五"科技支撑计划资助项目(2007BAE12B01-1) 湖南省科技计划资助项目(2009GK3150)
关键词 电极材料 FePO4·xH2O LIFEPO4/C 电化学性能 均匀沉淀法 electrode materials FePO4·xH2O LiFePO4/C electrochemical performance homogenous precipitation method
分类号 TM912.9 [电气工程—电力电子与电力传动]
  • 相关文献

参考文献22

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二级参考文献16

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共引文献16

同被引文献83

  • 1吴爱德,张向军,卢世刚,阚素荣.Li_2CO_3,FePO_4和葡萄糖合成LiFePO_4的机制研究[J].稀有金属,2010,34(6):880-886. 被引量：6
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引证文献7

二级引证文献15

中国有色金属学报
2012年 第5期

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