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化学电源近期研究专辑(武汉大学 杨汉西教授主编)

LiNi0.49Mn1.49Y0.02O4的合成及其电化学性能研究

  • 张先文 ,
  • 章正熙 ,
  • 杨立 ,
  • 房少华 ,
  • 屈龙
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  • 上海交通大学化学化工学院,上海 200240

收稿日期: 2011-11-24

  修回日期: 2012-01-06

  网络出版日期: 2012-01-16

基金资助

国家自然科学基金(21173148)资助

Synthesis and Electrochemical Properties of Yttrium-Doped LiNi0.49Mn1.49Y0.02O4

  • ZHANG Xian-Wen ,
  • ZHANG Zheng-Xi ,
  • YANG Li ,
  • FANG Shao-Hua ,
  • QU Long
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  • School of Chemistry and Chemical Engineering, Shanghai JiaoTong University ,Shanghai, 200240, China

Received date: 2011-11-24

  Revised date: 2012-01-06

  Online published: 2012-01-16

摘要

应用柠檬酸辅助溶胶凝胶方法,合成了Y3+取代的尖晶石LiNi0.49Mn1.49Y0.02O4材料. XRD、循环伏安法、恒流充放电和交流阻抗测试结果表明,Y3+的掺杂能提高LiNi0.5Mn1.5O4的倍率和循环性能,在电压区间3.5 ~ 4.9 V,1C倍率下,其初始容量为114.9 mAh?g-1,100次循环后放电比容量仍可达到113 mAh?g-1,容量保持率98.3%,掺杂Y3+能减小材料界面阻抗.

本文引用格式

张先文 , 章正熙 , 杨立 , 房少华 , 屈龙 . LiNi0.49Mn1.49Y0.02O4的合成及其电化学性能研究[J]. 电化学, 2012 , 18(2) : 140 -145 . DOI: 10.61558/2993-074X.2894

Abstract

The LiNi0.49Mn1.49Y0.02O4 cathode material was synthesized using the citric acid-assisted sol-gel method by partial substitutions of Ni and Mn with Y in the LiNi0.5Mn1.5O4 material. The influences of Y doping on the structure and electrochemical properties were investigated by means of X-ray diffraction, cyclic voltammetry, galvanostatic charge/discharge tests and AC impedance spectroscopy. The results showed that the introduction of Y into the LiNi0.5Mn1.5O4 greatly improved the cycle performance and rate capability. When the charge and discharge current was 1 C in the potential range from 3.5 to 4.9 V, the LiNi0.49Mn1.49Y0.02O4 electrode delivered the initial discharge capacity of 114.9 mAh?g-1 and 113mAh?g-1 after 100 cycles with the capacity retention of 98.3%. AC impedance data indicated that the LiNi0.49Mn1.49Y0.02O4 electrode had the lower impedance value during cycling, and Y doping effectively stabilized the crystal structure.
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