温度对尖晶石LiFe0.05Mn1.95O4中锂离子嵌脱过程的影响
Effects of Temperature on the Intercalation-Decalation Process of Lithium Ion in the Spinel LiFe0.05Mn1.95O4
采用溶胶-凝胶法对纯相尖晶石LiMn2O4进行了微量的Fe掺杂改性，合成了化学式为LiFe0.05Mn1.95O4的尖晶石锂锰氧化物材料，并运用电化学阻抗谱研究了LiFe0.05Mn1.95O4电极在1 M LiPF6-EC:DEC:DMC（1:1:1,体积比）电解液中随温度的变化时的阻抗谱特征，以及固体电解质相界面(SEI)膜电阻、电子电阻等随温度的变化。研究结果表明，尖晶石LiFe0.05Mn1.95O4电极的阻抗谱特征与温度有关，且高频区域压扁拉长的半圆是由两个半圆相互重叠而成，并在低温下更容易发生分离。通过选取适当的等效电路拟合了实验所得的电化学阻抗谱数据，并测定了相关的动力学参数，得出铁的掺杂对SEI膜阻抗的影响较小，但能够提高尖晶石材料的电子电导率的结论。
Variations of impedance spectra, and electronic resistance, as well as the resistances of the solid electrolyte interphase (SEI) film of the spinel LiFe0.05Mn1.95O4 electrode were investigated by electrochemical impedance spectroscopy (EIS) in 1 M LiPF6-EC:DEC:DMC electrolyte solutions in different temperature. The results illustrate that the depressed semicircle in the high frequency region consists of two semicircles that are overlapped each other, It seems that the two semicircles would separate easier at lower temperature. The experimental EIS data was simulated by a suitable equivalent circuit that includes elements related to the electronic and ionic transport in addition to the charge transfer process. It is found that Fe doping had little effects on the resistances of SEI film, but it can improve the electrocon ductibility obviously.
秦银平
电化学工业化学工业概论无机化学工业
锂离子电池溶胶-凝胶法掺杂电化学阻抗谱（EIS）
lithium ion batteriessol-geldopeelectrochemical impedance spectroscopy( EIS)
秦银平.温度对尖晶石LiFe0.05Mn1.95O4中锂离子嵌脱过程的影响[EB/OL].(2010-09-16)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201009-364.点此复制
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