Influence of Potassium Metal-Support Interactions on Dendrite Growth |
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| Authors: | Pengcheng Liu Dean Yen Bairav S. Vishnugopi Varun R. Kankanallu Doğa Gürsoy Mingyuan Ge John Watt Partha P. Mukherjee Yu-chen Karen Chen-Wiegart David Mitlin |
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| Affiliation: | 1. Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX 78712-1591 USA;2. Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794 USA;3. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907 USA;4. Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439 USA;5. National Synchrotron Light Source II (NSLS-II), Brookhaven National Laboratory, Upton, NY 11973-5000 USA;6. Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM 87545 USA;7. Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794 USA National Synchrotron Light Source II (NSLS-II), Brookhaven National Laboratory, Upton, NY 11973-5000 USA |
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| Abstract: | Combined synchrotron X-ray nanotomography imaging, cryogenic electron microscopy (cryo-EM) and modeling elucidate how potassium (K) metal-support energetics influence electrodeposit microstructure. Three model supports are employed: O-functionalized carbon cloth (potassiophilic, fully-wetted), non-functionalized cloth and Cu foil (potassiophobic, nonwetted). Nanotomography and focused ion beam (cryo-FIB) cross-sections yield complementary three-dimensional (3D) maps of cycled electrodeposits. Electrodeposit on potassiophobic support is a triphasic sponge, with fibrous dendrites covered by solid electrolyte interphase (SEI) and interspersed with nanopores (sub-10 nm to 100 nm scale). Lage cracks and voids are also a key feature. On potassiophilic support, the deposit is dense and pore-free, with uniform surface and SEI morphology. Mesoscale modeling captures the critical role of substrate-metal interaction on K metal film nucleation and growth, as well as the associated stress state. |
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| Keywords: | Metal Dendrite Potassium Ion Battery Potassium Metal Battery Potassium Sulfur Battery |
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