| Autor: |
Ho AS; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Parkinson DY; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States., Finegan DP; National Renewable Energy Laboratory, Golden, Colorado 80401, United States., Trask SE; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States., Jansen AN; Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States., Tong W; Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory Berkeley, California 94720, United States., Balsara NP; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.; Energy Technologies Area, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States. |
| Abstrakt: |
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. |
