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Potassium‐ion batteries (KIBs) are plagued by a lack of materials for reversible accommodation of the large‐sized K+ ion. Herein we present, the Bi anode in combination with the dimethoxyethane‐(DME) based electrolyte to deliver a remarkable capacity of ca. 400 mAh g−1 and long cycle stability with three distinct two‐phase reactions of Bi↔ KBi2↔K3Bi2↔K3Bi. These are ascribed to the gradually developed...
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