石墨
介电谱
电解质
电极
镍
分析化学(期刊)
电化学
插层(化学)
扩散
金属
材料科学
化学
电化学动力学
无机化学
物理化学
冶金
热力学
有机化学
物理
作者
Hermann Schranzhofer,Jerzy Bugajski,Heinrich Santner,Christiane Korepp,Kai‐Christian Möller,Jürgen Besenhard,Martin Winter,Werner Sitte
标识
DOI:10.1016/j.jpowsour.2005.05.034
摘要
The long-term formation kinetics of the solid electrolyte interphase (SEI) was studied on graphite electrodes in 1 M LiClO4/PC with 5% acrylonitrile (AN) as electrolyte additive by electrochemical impedance spectroscopy at 1.0 and 0.5 V versus Li/Li+, i.e. mainly outside the graphite intercalation region. To support the interpretation of the results, comparative experiments with Ni and Pt electrodes were performed at the same potentials. The resistance of the SEI on graphite and nickel shows similar time dependence. Whereas, RSEI of both electrodes exhibits a linear increase after 5–10 h at 1.0 V, a parabolic behavior could be observed at 0.5 V (and even more expressed for Ni at 0.05 V) typical of diffusion controlled growth kinetics. Temperature dependent measurements yielded activation energies for the ionic conduction of the SEI between 0.61 and 0.66 eV. The results were the same for graphite at 0.5 V and nickel at 1.0, 0.5 and 0.05 V.
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