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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第5期    总第249期    2015年5月

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文章编号:1672-7207(2015)05-1595-07
固体电解质Li5La3Ta2O12包覆LiMn2O4的改性研究
彭红建,曹远尼,肖理红,栾向峰,刘素琴

(中南大学 化学化工学院,湖南 长沙,410083)

摘 要: 采用溶胶-凝胶的方法低温制备石榴石结构的固体电解质Li5La3Ta2O12,并用其包覆LiMn2O4来改善材料的电化学性能。通过XRD,SEM和TEM等表征手段对材料的结构和形貌进行分析,并通过恒电流充放电、循环伏安、交流阻抗等测试分析材料的电化学性能。研究结果表明:Li5La3Ta2O12包覆的LiMn2O4材料与未包覆的材料相比,其电化学性能得到明显改善,经过150次循环后包覆材料的放电比容量保持率为92%,在高倍率10C(C为倍率)下包覆材料放电比容量为61.2 mA·h/g,而未包覆材料放电比容量仅为40.7 mA·h/g;包覆Li5La3Ta2O12后,LiMn2O4的阻抗明显减小,大幅度提高了其循环性能和倍率性能。

 

关键词: 溶胶-凝胶法;Li5La3Ta2O12;包覆;LiMn2O4

Modification of Li5La3Ta2O12 coated LiMn2O4
PENG Hongjian, CAO Yuanni, XIAO Lihong, LUAN Xiangfeng, LIU Suqing

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:LiMn2O4,Li5La3Ta2O12 (LLTO) was prepared by sol-gel method and it was employed as a coating layer on the surface of LiMn2O4. The structure and morphology of the material were analyzed by XRD, SEM and other characterization methods. The electrochemical performance of the material was analyzed by galvanostatic charge-discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that the electrochemical performance of the LLTO-coated LiMn2O4 is improved significantly. The resistance of LLTO-coated LiMn2O4 is reduced significantly. After 150 cycles test, the discharge capacity retention rate of the coated material is 92%.At the high-rate of 10C, the discharge capacity of the LLTO-coated LiMn2O4 is 61.2 mA·h/g and that of the uncoated material is 40.7 mA·h/g. The impedance of LLTO-coated LiMn2O4 decreases evidently, therefore the cycle performance and rate capability increase greatly.

 

Key words: sol-gel method; Li5La3Ta2O12; coating; LiMn2O4

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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