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研究论文

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
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  • 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

  网络出版日期: 2015-08-28

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
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  • College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Received date: 2015-01-13

  Revised date: 2015-03-23

  Online published: 2015-08-28

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.

本文引用格式

胡俊艳 , 王蒙蒙 , 刘洪涛 . 尖晶石型LiMn1.9Al0.1O3.95F0.05材料的制备及其增强的倍率性能[J]. 电化学, 2015 , 21(4) : 382 -386 . DOI: 10.13208/j.electrochem.150113

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).
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