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电化学(中英文) ›› 2002, Vol. 8 ›› Issue (2): 165-171. 

• 研究论文 • 上一篇    下一篇

掺锶尖晶石相-LiSr_xMn_(2-x)O_4的合成和电化学性能研究

詹晖,周运鸿   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北,武汉430072 ,湖北,武汉430072
  • 收稿日期:2002-05-28 修回日期:2002-05-28 出版日期:2002-05-28 发布日期:2002-05-28

An investigation on Sr-doped spinel phase-LiSr xMn _(2-x ) O _4

ZHAN Hui,ZHOU Yun_hong*   

  1. (College of chemistry & molecule Science, Wuhan University,Wuhan 430072,China
  • Received:2002-05-28 Revised:2002-05-28 Published:2002-05-28 Online:2002-05-28

摘要: 采用固相合成方法制备掺锶尖晶石型锂锰氧化物 ,通过X射线衍射法对材料的结构进行了表征 .结果表明 ,当掺入的锶含量较低时 ,得到的产物具有尖晶石结构特征 ,并表现出极佳的电化学性能 ,材料在充放电循环 90周次后仍能保持 95%的容量

关键词: LiSrxMn2-xO4, 尖晶石相, 循环性能

Abstract: Sr_doped spinel phase_LiSrxMn 2-x O4 was successfully prepared by solid_state method. Structural and electrochemical characterizations were carried out. Although Sr 2+ has a large ion radius_1.12 ,the spinel structure can be well maintained for LiSrxMn 2-x O4 sample as far as the x value doesn't surpass 0.05. Electrochemical study presents supporting evidence that doping the stoichiometric LiSrxMn 2-x O4 phase with Sr is an effective way to improve the cycleability of LiSrxMn 2-x O4 spinel material. A remarkable enhancement of the cycleability with retention of the initial capacity >90 % after 95 cycles was observed for the Sr_doped spinel.

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