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电化学（中英文） ›› 2013, Vol. 19 ›› Issue (3): 232-236.  doi: 10.61558/2993-074X.2954

• 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） • 上一篇    下一篇

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*   

  1. 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 发布日期:2013-01-21 出版日期:2013-06-28
  • 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*   

  1. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China
  • Received:2012-10-12 Revised:2013-01-16 Online:2013-01-21 Published:2013-06-28

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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.

关键词:

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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