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电化学(中英文) ›› 2015, Vol. 21 ›› Issue (4): 382-386.  doi: 10.13208/j.electrochem.150113

• 研究论文 • 上一篇    下一篇

尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能

胡俊艳,王蒙蒙,刘洪涛*   

  1. 中南大学化学化工学院,湖南 长沙 410083
  • 收稿日期:2015-01-13 修回日期:2015-03-23 出版日期:2015-08-28 发布日期:2015-08-28
  • 通讯作者: 刘洪涛 E-mail:liuht@csu.edu.cn
  • 基金资助:

    湖南省科技计划重点项目(No. 2014FJ2007)、湖南省自然科学基金重点项目(No. 10JJ2004)及国家自然科学基金面上项目(No. 20976198)资助

Preparation and Enhanced Rate Capability of Spinel LiMn1.9Al0.1O3.95F0.05

HU Jun-yan, WANG Meng-meng, LIU Hong-tao*   

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
  • Received:2015-01-13 Revised:2015-03-23 Published:2015-08-28 Online:2015-08-28
  • Contact: LIU Hong-tao E-mail:liuht@csu.edu.cn

摘要: 通过溶胶-凝胶和高温固相掺杂反应可控合成了形貌均匀、结晶性好的尖晶石型LiMn1.9Al0.1O3.95F0.05正极材料,探究了Al部分取代Mn、F部分取代O后对结构的影响,测试并比较了电极材料的倍率性能和循环充放电性能. 结果表明,尖晶石型LiMn1.9Al0.1O3.95F0.05和LiMn2O4有同样的晶型,但电极较传统的LiMn2O4电极倍率稳定性有显著提高. 在连续混合(如0.1C、0.5C和1C)充放电150次后,LiMn1.9Al0.1O3.95F0.05电极的容量仍能保持90%以上.

关键词: 尖晶石锰酸锂, 锂离子电池, 溶胶-凝胶, 倍率性能, 容量保持

Abstract: Spinel LiMn1.9Al0.1O3.95F0.05 cathode materials with good crystallinity were synthesized by a sol-gel process followed with a high-temperature solid reaction. The effects of partial substitution of Al for Mn, and F for O on the structure and the electrochemical performance were investigated. The results showed that LiMn1.9Al0.1O3.95F0.05 exhibited the same crystalline state as LiMn2O4, but much better electrochemical stability at higher rate cycling. As a result, LiMn1.9Al0.1O3.95F0.05 could maintain stable electrochemical lithium storage even suffering from different rate currents that retains over 90% of the initial capacity after 150 cycles at continuously varying currents (i.e. 0.1C, 0.5C, and 1C).

Key words: spinel lithium manganese oxide, lithium-ion battery, sol-gel method, rate capability, capacity retention

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