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This is the first record of a multifunctional separator for potassium‐metal batteries. Double‐coated tape‐cast micro‐scale AlF3 on polypropylene yield state‐of‐the‐art electrochemical efficiency: Symmetric cells are secure after 1,000 cycles at 0. 5 mA centimeters-- 2 and 0. 5 mAh cm-- 2, with 0. 042 V overpotential. Post‐cycled plated surface is dendrite‐free, while removed surface contains smooth SEI. Potassium hexacyanoferrate cathode KMBs with AlF3@PP show the boosted capability retention. AlF3 partly reacts with K to form an artificial SEI having Al2O3, kf and alf3 phases. In full batteries AlF3 prevents Fe crossover and cycling‐induced cathode pulverization.
We employed duplicated chilly rolling and folding to make a metallurgical compound of sodium‐antimony‐telluride Na2 distributed in electrochemically active salt metal, termed "NST‐Na". Imaging and tomography making use of FIB sectioning, SEM, and TEM imaging suggest that salt metal fills the open space inside the self‐supporting sodiophilic NST skeleton, causing dense metal deposits with level surface areas. Thickness functional theory calculations reveal that uniqueness of NST hinges on the thermodynamic security of Na atoms on its surface that brings about planar wetting, and in its own stability that protects against disintegration throughout biking.
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