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化学电源近期研究专辑(武汉大学 杨汉西教授主编)

YF3包覆Li(Li0.22Ni0.17Mn0.61)O2正极材料的性能

  • 冯欣 ,
  • 李国然 ,
  • 叶世海 ,
  • 高学平
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  • 南开大学新能源材料化学研究所,天津 300071

收稿日期: 2011-11-24

  修回日期: 2012-02-16

  网络出版日期: 2012-02-21

基金资助

国家973计划(No. 2009CB220100)资助

Electrochemical Performance of YF3-Coated Li(Li0.22Ni0.17Mn0.61)O2 Cathode Material for Li-Ion Batteries

  • FENG Xin ,
  • LI Guo-Ran ,
  • YE Shi-Hai ,
  • GAO Xue-Ping
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  • Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

Received date: 2011-11-24

  Revised date: 2012-02-16

  Online published: 2012-02-21

摘要

富锂层状氧化物作为锂离子电池正极材料具有高比容量优势. 采用草酸盐共沉淀法制备Li(Li0.22Ni0.17Mn0.61)O2,并用YF3包覆电极. 采用X-射线衍射(XRD)、扫描电子显微镜(SEM)和X-射线能谱分析(EDS)表征材料结构、观察材料形貌. 研究结果表明,材料颗粒尺寸在100 ~ 200 nm范围,YF3包覆不会改变材料结构和形貌. 电化学恒流充放电测试表明,YF3包覆Li(Li0.22Ni0.17Mn0.61)O2电极的比容量,尤其倍率比容量,明显提高. 60 mA.g-1电流密度包覆电极材料30周循环后其比容量保持在220 mAh.g-1以上,1500 mA.g-1电流密度其比容量仍可达150 mAh.g-1. 电化学阻抗谱(EIS)测试结果表明,YF3包覆电极电荷转移电阻和扩散阻抗均明显降低,电化学性能改善.

本文引用格式

冯欣 , 李国然 , 叶世海 , 高学平 . YF3包覆Li(Li0.22Ni0.17Mn0.61)O2正极材料的性能[J]. 电化学, 2012 , 18(4) : 322 -327 . DOI: 10.61558/2993-074X.2925

Abstract

The Li(Li0.22Ni0.17Mn0.61)Owas prepared with oxalic co-precipitation and coated with an YF3 layer by a chemical deposition method. The as-prepared and YF3-coated Li-rich materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results demonstrate that the as-prepared and YF3-coated Li(Li0.22Ni0.17Mn0.61)O2 materials have a typical layered structure and are composed of sphere-like particles with a diameter of 100~200 nm. Galvanostatic charge-discharge tests show that the discharge capacity of the YF3-coated Li(Li0.22Ni0.17Mn0.61)O2 is obviously improved. At the low current density of 60 mA.g-1, the discharge capacity reaches 240 mAh.g-1, and remains 220 mAh.g-1 after 30 cycles. At the high current density of 1500 mA.g-1, the discharge capacity still keeps 150 mAh.g-1, showing an excellent high-rate capability. Electrochemical impedance spectra (EIS) reveal that the YF3-coated Li(Li0.22Ni0.17Mn0.61)O2 shows lower charge-transfer resistance and diffusion impedance as compared with the as-prepared Li(Li0.22Ni0.17Mn0.61)O2.

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