Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 43, Pages 22465-22471Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta08139a
Keywords
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Funding
- National Natural Science Foundation of China [21603171, 51602246]
- Postdoctoral Science Foundation of China [2016M592783]
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We propose potassium ferrous ferricyanide (KFeII[Fe-III(CN)(6)]) nano particles with a 3D open framework structure as a cathode for nonaqueous K-ion batteries. Electrochemical reaction mechanism analyses identify that two redox-active sites based on C and N coordinated Fe-II/Fe-III redox couples play a role in K-ion storage, and no phase change occurs in the different states of the initial and second charge-discharge processes. Thus, the (KFeII[Fe-III(CN)(6)] electrode exhibits a high discharge capacity of 118.7 mA h g(-1) at an operating voltage of 3.34 V and extremely excellent cycling stability with a capacity value of 111.3 mA h g(-1) after 100 cycles at 10 mA g(-1). Moreover, an ultralong cycling lifespan of 1000 cycles with a high capacity retention of 80.49% and extraordinary voltage stability at 100 mA g(-1) can be acquired. Ex situ characterizations verify that the outstanding electrochemical performance of (KFeII[Fe-III(CN)(6)] is attributed to superior structural stability and electrochemical reversibility upon long-term cycling. Therefore, the (KFeII[Fe-III(CN)(6)] material can make KlBs competitive in EES applications.
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