阳极
石墨
电极
电化学
材料科学
离子
电镀(地质)
核工程
化学
电气工程
分析化学(期刊)
复合材料
工程类
物理
色谱法
物理化学
有机化学
地球物理学
作者
Ilya A. Shkrob,Marco‐Tulio F. Rodrigues,Daniel P. Abraham
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-01-01
卷期号:168 (1): 010512-010512
被引量:17
标识
DOI:10.1149/1945-7111/abd609
摘要
Fast charging of Li-ion batteries would make “fueling” of electric vehicles comparable in time to fueling of gasoline-powered cars, increasing consumer appeal of the new technology. Taking the US Department of Energy goal of safe 6 C charging to 80% capacity as a guide, we describe approaches that can mitigate Li plating on the graphite anode. To make this possible, a variable-rate anode potential charging protocol has been implemented by using a microprobe reference electrode to continuously monitor and adjust the current, in this way avoiding low anode potentials that favor Li deposition. Various implementations of the anode potential control are considered using electrochemical modeling and compared with the experimental data. For charge to 80% capacity at 30 °C, an average C-rate of 4.97 C was obtained for an NCM523/graphite cell with 70 μ m thick graphite electrode and 7.40 C for a cell with 47 μ m thick graphite electrode. Our electrochemical model accounts for these observations and provides a means to extrapolate the approach to other cell designs and operation regimes, drawing the maximum average fast charging rates that can still avoid Li plating.
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