Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (6): 9-13.doi: 10.3969/j.issn.1000-565X.2016.06.002

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Preparation and Battery Performance of Spherical LiFePO4 /C Doped with Mg2+

YANG Wei1 XUE Jian-jun2 CHEN Sheng-zhou3 HU Xin-fa2 XIA Xin-de2 LIN Wei-ming1   

  1. 1.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Guangzhou Great Power Energy & Technology Co.,Ltd.,Guangzhou 511483,Guangdong,China; 3.School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,Guangdong，China
  • Received:2015-08-24 Revised:2015-10-25 Online:2016-06-25 Published:2016-05-03
  • Contact: 杨伟(1982-)，男，博士，助理研究员，主要从事应用电化学与新能源材料研究． E-mail:wyang608@163.com
  • About author:杨伟(1982-)，男，博士，助理研究员，主要从事应用电化学与新能源材料研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China(21376056，21463030)

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Abstract: Spherical LiFePO4 /C  doped with Mg2+ (namely LiMgx Fe1－x PO4 /C) was prepared by means of the spray drying-carbonthermal reduction,with citric acid,ferrous oxalate and magnesium acetate as the carbon source,the iron source and the magnesium source,respectively.Then,the effects of Mg2+ doping on the structure and electrochemical performance of the prepared LiFePO4 /C material were investigated.The results indicate that (1) LiMgx Fe1－x PO4 /C possesses a hollow ball-shaped structure and a high specific capacity; (2) the crystal struc- ture of lithium iron phosphate keeps unchanged at a low Mg2+ dosage; and (3) LiMg0.04 Fe0.96 PO4 /C possesses the best charge/discharge performance.For instance，its initial discharge capacities are 149. 0,145. 6,141. 3,132. 6 and 123. 3mAh/g at the rates of 0. 2C,0. 5C，1. 0C,2. 0C and 5. 0 C,respectively; and the capacity retention ra- tio of LiMg0.04 Fe0.96 PO4 /C at 1. 0C keeps more than 97. 3% after 100 charge-discharge cycles.

Key words: Mg2+ doping, spherical lithium iron phosphate, spray drying-carbothermal reduction, lithium ion battery

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