欢迎访问《电化学(中英文)》期刊官方网站,今天是

电化学(中英文) ›› 2012, Vol. 18 ›› Issue (2): 140-145.  doi: 10.61558/2993-074X.2894

• 化学电源近期研究专辑(武汉大学 杨汉西教授主编) • 上一篇    下一篇

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   

  1. 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 出版日期:2012-04-28 发布日期:2012-01-16
  • 通讯作者: 章正熙, 杨立 E-mail: zhengxizhang@yahoo.com.cn; liyangce@sjtu.edu.cn
  • 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   

  1. School of Chemistry and Chemical Engineering, Shanghai JiaoTong University ,Shanghai, 200240, China
  • Received:2011-11-24 Revised:2012-01-06 Published:2012-04-28 Online:2012-01-16
  • Contact: ZHANG Zheng-Xi, YANG Li E-mail: zhengxizhang@yahoo.com.cn; liyangce@sjtu.edu.cn

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.

关键词: 锂离子电池, LiNi0.5Mn1.5O4, Y掺杂

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.

Key words: lithium-ion batteries, LiNi0.5Mn1.5O4, Y doping

中图分类号: