Journal
CHEMELECTROCHEM
Volume 4, Issue 9, Pages 2237-2242Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201700410
Keywords
potassium-ion batteries; cathode materials; Prussian Blue; electrolyte; additives
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Funding
- National University of Singapore
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The reversible intercalation of K+ into graphite has spurred interest in new rechargeable battery chemistries based on potassium ions. The viability of commercializing potassium-ion batteries (KIBs) is critically dependent on the availability of prepotassiated cathode materials, and the compatibility between the electrolyte and electrode components; which have yet to be fully explored. Herein, we report a Fe and Mn based K-rich Prussian Blue analogue, which can be used as the cathode of rechargeable KIBs to deliver 115 mAh/g of discharge capacity with two voltage plateaus at 3.9 and 4.1 V vs. K+/K in an electrolyte with fluoroethylene carbonate additive. In half-cell studies, the cyclability of this Prussian Blue analogue was found to depend on the formation of a passivation layer on the anode and the decomposition of the active electrode material at the cathode. This study demonstrates the importance of electrode -electrolyte compatibility in the development of new rechargeable battery chemistries, especially when the evaluation is based on half-cell studies where potassium metal is used.
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