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An explorer is kayaking in uncharted territory, representing the exciting scientific pursuit of emerging metal batteries (MBs). Water is flowing smoothly over the jagged rocks, representing dendrite‐free metal anodes as well as enhanced electrolyte wetting, both due to geometrical roughness. The electric eels underneath represent potassium‐based energy storage, as they utilize potassium and sodium...
This is the first report of successful potassium metal battery anode cycling with an aluminum‐based rather than copper‐based current collector. Dendrite‐free plating/stripping is achieved through improved electrolyte wetting, employing an aluminum‐powder‐coated aluminum foil “Al@Al,” without any modification of the support surface chemistry or electrolyte additives. The reservoir‐free Al@Al half‐cell...
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