高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (9): 1633-1638.doi: 10.7503/cjcu20170060

• 物理化学 • 上一篇    下一篇

氮掺杂硅酸亚铁锂正极材料的制备及电化学性能

张冬1, 李亭亭1, 邱海龙1, 魏英进1, 王春忠1, 陈岗1, 岳惠娟2   

  1. 1. 吉林大学物理学院, 新型电池物理与技术教育部重点实验室, 长春 130012;
    2. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012
  • 收稿日期:2017-01-23 出版日期:2017-09-10 发布日期:2017-08-25
  • 通讯作者: 岳惠娟,女,博士,副教授,主要从事功能材料制备研究.E-mail:huijuan@jlu.edu.cn E-mail:huijuan@jlu.edu.cn
  • 基金资助:

    吉林省科技厅基金(批准号:20150204030GX,20160101320JC)资助.

Preparation and Characterization of N-doped Li2FeSiO4/C Cathode Materials for Lithium Ion Batteries

ZHANG Dong1, LI Tingting1, QIU Hailong1, WEI Yingjin1, WANG Chunzhong1, CHEN Gang1, YUE Huijuan2   

  1. 1. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2017-01-23 Online:2017-09-10 Published:2017-08-25
  • Supported by:

    Supported by the Science and Technology Development Planning of Jilin Province, China(Nos.20150204030GX, 20160101320JC).

摘要:

采用溶胶-凝胶法制备了氮掺杂的硅酸亚铁锂正极材料.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、充放电测试和交流阻抗测试(EIS)等对材料的结构及电化学性能进行了表征.结果表明,N元素已掺杂到Li2FeSiO4材料晶格中,样品具有较小的颗粒尺寸和优异的动力学性能,表现出较好的充放电比容量和倍率特性,首次放电比容量为130 mA·h/g,循环50次后比容量仍可达到124 mA·h/g,容量保持率高达95%.

关键词: 锂离子电池, 正极材料, 硅酸亚铁锂, 离子掺杂

Abstract:

N-doped lithium iron silicates(N-doped Li2FeSiO4, N-LFs) was prepared with sol-gel method. X-Ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, galvanosta-tic charge-discharge and electrochemical impedance spectra were used to investigate the effect of nitrogen doping on the characteristics of Li2FeSiO4. The results show that nitrogen does enter the cystal strucutre of Li2FeSiO4, resulting in smaller particle size and better kinetic properties, as well as higher specific capacity and rate capability. The doped sample could deliver a specific capacity of 130 mA·h/g in the first discharge and retain 124 mA·h/g after 50 cycles with the retention of 95%.

Key words: Lithium ion battery, Cathode material, Li2FeSiO4, Ion-doping

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