辽宁石油化工大学学报

辽宁石油化工大学学报 ›› 2015, Vol. 35 ›› Issue (5): 5-9.DOI: 10.3969/j.issn.1672-6952.2015.05.002

• 石油化工 • 上一篇    下一篇

L i F e 1-yMg yP O4的制备及电化学性能研究

康晓雪,于雪飞,杨占旭   

  1. ( 辽宁石油化工大学化学化工与环境学部, 辽宁抚顺1 1 3 0 0 1)
  • 出版日期:2015-10-25 发布日期:2015-11-02
  • 作者简介:康晓雪( 1 9 7 6 - ) , 女, 博士, 讲师, 从事电极材料、 复合材料及电化学研究; E - m a i l : k a n g x x 2 2@o u t l o o k. c o m。
  • 基金资助:
     国家自然科学基金项目( 2 1 4 0 1 0 9 3) ; 辽宁省自然科学基金项目( 2 0 0 8 2 1 8 7) ; 辽宁省博士科研启动基金项目( 2 0 1 1 1 0 6 1) ; 辽宁省教育厅科技攻关项目( L 2 0 1 1 0 5 7) 。

Synthesis and Electrochemical Properties of L i F e 1-yMg yP O4

Kang Xiaoxue, Yu Xuefei, Yang Zhanxu   

  1. (College of Chemistry, Chemical Engineering and Environmental Engineering,  Liaoning Shihua University, Fushun Liaoning 113001, China)
  • Published:2015-10-25 Online:2015-11-02

摘要: 采用机械活化一步固相法, 在F e位掺杂 Mg 2+ 合成了结晶度较好的 L i F e 1-yMg yP O4。采用 XR D、S EM 等方法对L i F e 1-yMg yP O4的结构和形貌进行了表征, 利用恒电流充放电法研究了 Mg 2+ 掺杂对 L i F e 1-yMg yP O4电化学性能的影响。结果表明, 适量 Mg 2+掺杂不改变L i F e P O4的晶体结构, 同时可以细化颗粒粒径, 增强导电性和可逆性, 有效地提高L i F e P O4的倍率性能和循环稳定性。L i F e 0. 9 9Mg 0. 0 1P O4在0. 1C和1C倍率条件下首次放电比容量分别为1 5 8. 7mA h / g和1 4 1. 9mA h / g, 循环5 0次后放电比容量几乎没有衰减。

关键词: 锂离子电池, L i F e P O4, L i F e 1-yMg yP O4, Mg 2+掺杂, F e位掺杂

Abstract: Fe site doped  L i F e 1-yMg yP O4 was synthesized by mechanical activationonestep solidification method. The structure, morphology and electrochemical properties of the product were investigated by XRD, SEM, CV and galvanostatic charge/discharge determination. The effect of Mg2+doping on electrochemical properties of the samples was discussed. The results show that the crystal structure of LiFePO4 was not changed after proper doping of Mg2+. In the meantime, the proper doping can refine the particle size, and improve the electrical conductivity and reversibility of LiFePO4. Accordingly, the rate performance and the cycling stability of LiFePO4 can be improved effectively. The initial discharge capacity of LiFe0.99Mg0.01PO4 was 158.7 mAh/g at 0.1 C rate and 141.9 mAh/g at 1.0 C rate. And the capacity has almost no attenuation after 50 cycles.

Key words: Li ion battery, LiFePOL i F e 1-yMg yP O4, Mg2+ doping, Fesite doping

引用本文

康晓雪,于雪飞,杨占旭. L i F e 1-yMg yP O4的制备及电化学性能研究[J]. 辽宁石油化工大学学报, 2015, 35(5): 5-9.

Kang Xiaoxue, Yu Xuefei, Yang Zhanxu. Synthesis and Electrochemical Properties of L i F e 1-yMg yP O4[J]. Journal of Liaoning Petrochemical University, 2015, 35(5): 5-9.

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