期刊
ELECTROCHIMICA ACTA
卷 83, 期 -, 页码 65-72出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.08.025
关键词
LaF3; Lithium ion battery; Spinel LiMn2O4; Surface coating; Electrochemical performance
资金
- Hunan Provincial Natural Science Foundation of China [12JJ3017]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC2012016]
- NSFC [51164006]
The cycle performance of spinet LiMn2O4 at 25 and 55 degrees C is improved by LaF3 modification via a chemical deposition method. The physical and electrochemical performances of pristine and LaF3-coated LiMn2O4 cathode materials are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical measurements. The coated LiMn2O4 with 2.92 wt% LaF3 (LaF3-3-LMO) displays capacity retentions of 90.1% and 84.2% at 25 and 55 degrees C, respectively, after 100 cycles, much higher than those of pristine LiMn2O4, 72.7% and 54.8%. The concentration of manganese dissolved from LaF3-3-LMO in electrolyte is much lower than that from pristine LiMn2O4. The analysis of AC impedance indicates that the charge transfer resistance (R-ct) and the increase of R-ct for LaF3-3-LMO during cycling are much lower than those for pristine LiMn2O4. The significantly improved electrochemical performance of the LaF3-coated LiMn2O4 can be attributed to the reduction of manganese dissolution in electrolyte and charge transfer resistance with the help of LaF3 coating. (C) 2012 Elsevier Ltd. All rights reserved,
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