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ChemSusChem. 2018 Apr 25;11(8):1285-1289. doi: 10.1002/cssc.201800057. Epub 2018 Mar 23.

Low-Cost K4 Fe(CN)6 as a High-Voltage Cathode for Potassium-Ion Batteries.

Pei Y1, Mu C1, Li H1, Li F1, Chen J1,2.

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Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300071, P. R. China.


Potassium-ion batteries (KIBs) are of interest for large-scale electrical energy storage, owing to the abundance of K resources and potential high energy density. Low-cost cathodes with high performance are crucial for KIBs. Herein, K4 Fe(CN)6 is shown to be a low-cost and high-voltage cathode for KIBs. It can deliver a high voltage of approximately 3.6 V and a discharge capacity of 65.5 mAh g-1 with a lifespan of 400 cycles of discharge and charge. This is attributed to the strong σ bonds between C atoms and Fe and to the reduced particle size and good contact with conductive carbon brought about by ball milling, which benefit both the K+ ion and the electronic conduction. The [Fe(CN)6 ]3-/4- redox couple is found to be responsible for charge compensation upon reversible extraction/insertion of K+ from/into K4 Fe(CN)6 . The high voltage and stability of K4 Fe(CN)6 will make it a promising low-cost cathode for KIBs and encourage more investigations into high-performance cathode materials.


batteries; electrode materials; energy density; polarization; potassium


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