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Low‐Cost K 4 Fe(CN) 6 as a High‐Voltage Cathode for Potassium‐Ion Batteries
Author(s) -
Pei Yuhou,
Mu Chaonan,
Li Haixia,
Li Fujun,
Chen Jun
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800057
Subject(s) - cathode , materials science , ion , voltage , potassium , redox , high voltage , energy storage , chemistry , electrical engineering , metallurgy , power (physics) , physics , organic chemistry , quantum mechanics , engineering
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, K 4 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 K 4 Fe(CN) 6 . The high voltage and stability of K 4 Fe(CN) 6 will make it a promising low‐cost cathode for KIBs and encourage more investigations into high‐performance cathode materials.