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锂离子和燃料电池近期研究专辑(厦门大学 董全峰教授主编)

Al掺杂尖晶石LiMn2O4正极材料的性能

  • 王永龙 ,
  • 王文阁 ,
  • 张倩 ,
  • 王昕 ,
  • 曹建胜 ,
  • 叶世海?
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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: 2012-10-12

  修回日期: 2013-01-16

  网络出版日期: 2013-01-21

基金资助

国家自然科学基金项目(No. 21273119)资助

Electrochemical Performance of Al-Doped Spinel LiMn2O4 Cathode Material for Li-ion Batteries

  • WANG Yong-Long ,
  • WANG Wen-Ge ,
  • ZHANG Qian ,
  • WANG Xin ,
  • CAO Jian-Sheng ,
  • YE Shi-Hai
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  • Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

Received date: 2012-10-12

  Revised date: 2013-01-16

  Online published: 2013-01-21

摘要

尖晶石LiMn2O4作为锂离子电池正极可大电流放电,且成本低、环境友好. 采用溶胶-凝胶法制备尖晶石LiMn2O4及Al掺杂材料. 使用X-射线衍射(XRD)和扫描电子显微镜(SEM)观察材料结构与形貌. 结果表明,复合材料颗粒尺寸300 ~ 500 nm,呈类球形. 电化学恒流充放电测试表明,Al掺杂尖晶石LiMn2O4电极的循环性明显提高,Al掺杂5%LiMn2O4(by mass,下同)正极在1C倍率充放电100周期循环后的容量保持率为98.2%,1C倍率充电、5C倍率放电下,100周期循环后其容量保持率为99.0%,表现出较优的电化学循环性能.

本文引用格式

王永龙 , 王文阁 , 张倩 , 王昕 , 曹建胜 , 叶世海? . Al掺杂尖晶石LiMn2O4正极材料的性能[J]. 电化学, 2013 , 19(3) : 232 -236 . DOI: 10.61558/2993-074X.2954

Abstract

Spinel LiMn2O4, a cathode material for Li-ion batteries, is featured as good high-rate performance, low cost and environmental friendly. The pristine and Al-doped LiMn2O4 samples were prepared by sol-gel method. The structure and micromorphology of the as-prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results demonstrated that the as-prepared LiMn2O4 samples had a typical cubic spinel structure and were composed of sphere-like particles with a diameter range of 300 ~ 500 nm. Galvanostatic charge-discharge tests showed that the LiMn2O4 samples doped with Al element exhibited an enhanced cycling performance. Especially, in the case of LiMn2O4 with 5% Al-doped, the discharge capacity retention was about 98.2% at the rate of 1C discharge and was 99% at the rate of 5C discharge, based on the same charge rate of 1C.
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