Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 17, Pages 4687-4691Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201801389
Keywords
bismuth; cycle stability; dimethoxyethane-based electrolyte; energy density; potassium-ion batteries
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Funding
- Ministry of Science and Technology of China [2017YFA0206700]
- National Natural Science Foundation of China [21603108, 51671107]
- 111 project [B12015]
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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 mAhg(-1) and long cycle stability with three distinct two-phase reactions of Bi <-> KBi2 <-> K3Bi2 <-> K3Bi. These are ascribed to the gradually developed three-dimensional (3D) porous networks of Bi, which realizes fast kinetics and tolerance of its volume change during potassiation and depotassiation. The porosity is linked to the unprecedented movement of the surface Bi atoms interacting with DME molecules, as suggested by DFT calculations. A full KIB of Bi//DME-based electrolyte//Prussian blue of K0.72Fe[Fe(CN)(6)] is demonstrated to present large energy density of 108.1 Wh kg(-1) with average discharge voltage of 2.8 V and capacity retention of 86.5% after 350 cycles.
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