Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703496
Keywords
anodes; bismuth; microparticles; phase transitions; potassium-ion batteries
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Funding
- Hong Kong Polytechnic University [1-ZE83]
- Innovation and Technology Commission (ITF Project) of Hong Kong SAR [ITS/029/17]
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Potassium-ion batteries (KIBs) are important alternatives to lithium- and sodium-ion batteries. Herein, microsized a Bi electrode delivers exceptional potassium storage capacity, stability, and rate capability by the formation of an elastic and adhesive oligomer-containing solid electrolyte interface with the assistance of diglyme electrolytes. The kinetics-controlled K-Bi phase transitions are unraveled combining electrochemical profiles, in situ X-ray diffraction and density functional theory calculations. Reversible, stepwise Bi-KBi2-K3Bi2-K3Bi transitions govern the electrochemical processes after the initial continuous surface potassiation. The Bi electrode outperforms the other anode counterparts considering both capacity and potential. This work provides critical insights into the rational design of high-performance anode materials for KIBs.
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