无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2014, Vol. 46 ›› Issue (3): 75-.

• 论文 • 上一篇    

铁位掺杂对磷酸铁锂电化学性能的影响

周勇华1,方 莹1,李 镇1,刘玲玲2,钱 慧1,曹 君1,顾龙华1   

  1. 1.南京工业大学材料科学与工程学院,江苏南京 210009;2.南昌航空大学环境与化学工程学院
  • 出版日期:2014-03-10 发布日期:2014-03-07

Effects on the electrochemical performance of LiFePO4 by doping at Fe site

Zhou Yonghua1,Fang Ying1,Li Zhen1,Liu Lingling2,Qian Hui1,Cao Jun1,Gu Longhua1   

  1. 1.School of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China;
    2.School of Environmental and Chemical Engineering,Nanchang Hangkong University
  • Online:2014-03-10 Published:2014-03-07

摘要: 采用球磨法制备了铁位掺杂的磷酸铁锂(LiFePO4)正极材料。使用X射线衍射(XRD)、环境扫描电子显微镜(ESEM)对制备的材料进行表征,并将材料组装成扣式电池,使用蓝电系统和电化学工作站对其进行电化学性能测试和分析。结果表明,LiM0.05Fe0.95PO4和LiFePO4结构几乎一样,在0.1 C倍率下LiFePO4的首次放电比容量为125 mA·h/g,掺杂M(M=Mg,Cu,Zn)后首次放电比容量为145、141、139 mA·h/g,材料的电化学性能明显提高,其交流阻抗减小,循环50次后容量保持率为87%左右。

关键词: 磷酸铁锂, 掺杂, 电化学性能

Abstract: LiFePO4 anode materials which were doped at the Fe site were prepared by ball milling.The samples were characterized by X-ray diffraction(XRD) and environmental scanning electron microscope(ESEM),and they were made in button-type electrochemical cells for performance testing and analysis by using the Land system and electrochemical working station.Results indicated that the LiM0.05Fe0.95PO4 and LiFePO4 samples had the same crystal structure.At 0.1 C rates,the initial discharge capacity of LiFePO4 was 125 mA·h/g,and the initial discharge capacities were up to 145,141,and 139 mA·h/g after doping by M(M=Mg,Cu,and Zn) at Fe site,respectively.It improved the electrochemical properties of the materials significantly and reduced its alternating-current impedance.The capacity remaining rate was about 87% after 50 cycles.

Key words: LiFePO4, doping, electrochemical properties

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