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Potassium ferrous ferricyanide nanoparticles as high capacity and ultralong life cathode material for nonaqueous potassium-ion batteries

Abstract

We propose potassium ferrous ferricyanide (KFeII[FeIII(CN)6]) nanoparticle with a 3D open framework structure as cathode for nonaqueous K-ion batteries. Electrochemical reaction mechanism analyses identify that two redox-active sites based on C and N coordinated FeII/FeIII redox couples play a role in K-ions storage and no phase change occurs in the different states of the initial and sencond charge-discharge processes. Thus, KFeII[FeIII(CN)6] electrode exhibits a high discharge capacity of 118.7 mAh•g-1 with an operating voltage of 3.34 V and extremely excellent cycling stability with capacity value of 111.3 mAh•g-1 after 100 cycles at 10 mA•g-1. Moreover, ultralong cycling lifespan for 1000 cycles with 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 performances of KFeII[FeIII(CN)6] are attributed to superior structural stability and electrochemical reversibility upon long-term cycle. Therefore, KFeII[FeIII(CN)6] material can make KIBs competitive in EES applications.

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Publication details

The article was received on 15 Sep 2017, accepted on 09 Oct 2017 and first published on 09 Oct 2017


Article type: Communication
DOI: 10.1039/C7TA08139A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Potassium ferrous ferricyanide nanoparticles as high capacity and ultralong life cathode material for nonaqueous potassium-ion batteries

    S. Chong, Y. Z. Chen, Y. Zheng, Q. Tan, C. Shu, Y. Liu and Z. Guo, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08139A

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