石墨
分离器(采油)
电极
材料科学
阳极
锂(药物)
集电器
复合材料
电解质
化学
医学
热力学
物理
内分泌学
物理化学
作者
Alec S. Ho,Dilworth Y. Parkinson,Donal P. Finegan,Stephen E. Trask,Andrew N. Jansen,Wei Tong,Nitash P. Balsara
出处
期刊:ACS Nano
[American Chemical Society]
日期:2021-06-10
卷期号:15 (6): 10480-10487
被引量:43
标识
DOI:10.1021/acsnano.1c02942
摘要
A barrier to the widespread adoption of electric vehicles is enabling fast charging lithium-ion batteries. At normal charging rates, lithium ions intercalate into the graphite electrode. At high charging rates, lithiation is inhomogeneous, and metallic lithium can plate on the graphite particles, reducing capacity and causing safety concerns. We have built a cell for conducting high-resolution in situ X-ray microtomography experiments to quantify three-dimensional lithiation inhomogeneity and lithium plating. Our studies reveal an unexpected correlation between these two phenomena. During fast charging, a layer of mossy lithium metal plates at the graphite electrode–separator interface. The transport bottlenecks resulting from this layer lead to underlithiated graphite particles well-removed from the separator, near the current collector. These underlithiated particles lie directly underneath the mossy lithium, suggesting that lithium plating inhibits further lithiation of the underlying electrode.
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