阳极
离子
外推法
电化学
电阻抗
非线性系统
石墨
材料科学
化学
电化学电池
极化(电化学)
电极
分析化学(期刊)
复合材料
物理
量子力学
数学分析
色谱法
物理化学
数学
有机化学
作者
Ilya A. Shkrob,Marco‐Tulio F. Rodrigues,Dennis W. Dees,Daniel P. Abraham
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2019-01-01
卷期号:166 (14): A3305-A3313
被引量:24
摘要
In this series, Li/Cu microprobes are used to monitor potentials of individual electrodes in situ during high-rate charging of Li-ion cells. Here we focus on capacity-limited charging of these cells to 6C, and present a general treatment of polarization that allows for data reduction and accurate interpolation/extrapolation over a wide range of charge rates. We show that the anode impedance as measured both using this new treatment and the more established pulsed-current techniques is not significantly changed after high-rate aging of the cell, including the conditions under which Li plating has occurred. Our measurements suggest that the changes in cell and electrode polarization to a large extent occur through nonlinear effects that involve time-delayed processes. An electrochemical model that includes phase dynamics in lithiated graphite is shown to capture some but not all of the observed trends suggesting that important facets of the high-rate behavior need to be included in such models.
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