Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (10): 2353-2359.doi: 10.3866/PKU.WHXB20111004

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Electrochemical Impedance Spectra of Intercalation Compound Electrodes: Models and Theoretical Simulations

XU Shou-Dong1,2, ZHUANG Quan-Chao1, SHI Yue-Li1, ZHU Ya-Bo1,2, QIU Xiang-Yun1,2, SUN Zhi1   

  1. 1. Li-ion Batteries Laboratory, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China;
    2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, P. R. China
  • Received:2011-05-04 Revised:2011-07-12 Published:2011-09-27
  • Contact: ZHUANG Quan-Chao
  • Supported by:

    The project was supported by the Fundamental Research Funds for the Central Universities, China (2010LKHX03, 2010QNB04, 2010QNB05), Science and Technology"Climbing"Program of CUMT, China (ON090237) and Natural Science Foundation of Jiangsu Province, China (BK2008129).

Abstract: Single intercalation particles, mixed particles, homogeneous porous electrodes and nonhomogeneous, multilayered porous electrode models are proposed in this paper. Some peculiar features of impedance spectra were simulated using the above-mentioned models. The results reveal that the features of impedance spectra of the single intercalation particle and the mixed particles are the same and the features consist of lithium ion migration through the solid electrolyte interphase (SEI) film (RSEICSEI semicircle), an electron and ion transfer process (RctCdl semicircle), and a finite-diffusion Warburg element. For the nonhomogeneous, multilayered porous electrodes model, a peculiar feature of impedance spectra is that a new arc appears in the Nyquist plot. A detailed analysis revealed that a different particle size distribution could lead to the appearance of a new arc and a different layer distribution (a thicker layer and a thinner layer), which could lead to a well-developed semicircle.

Key words: Lithium ion battery, Intercalation compound, Nonhomogeneous, Porous electrode, Electrochemical impedance spectroscopy


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