Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202300943
Keywords
Metal Dendrite; Potassium Ion Battery; Potassium Metal Battery; Potassium Sulfur Battery
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Combined synchrotron X-ray nanotomography imaging, cryogenic electron microscopy (cryo-EM) and modeling are used to investigate the influence of potassium (K) metal-support energetics on electrodeposit microstructure. The results show that the choice of support material significantly affects the morphology of the deposited metal. The mesoscale modeling also reveals the importance of substrate-metal interaction on film nucleation and growth.
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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