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Issue 43, 2017
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Potassium ferrous ferricyanide nanoparticles as a high capacity and ultralong life cathode material for nonaqueous potassium-ion batteries

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Abstract

We propose potassium ferrous ferricyanide (KFeII[FeIII(CN)6]) nanoparticles 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 FeII/FeIII 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[FeIII(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[FeIII(CN)6] is attributed to superior structural stability and electrochemical reversibility upon long-term cycling. Therefore, the KFeII[FeIII(CN)6] material can make KIBs competitive in EES applications.

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

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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, 2017,5, 22465-22471
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    Potassium ferrous ferricyanide nanoparticles as a high capacity and ultralong life cathode material for nonaqueous potassium-ion batteries

    S. Chong, Y. Chen, Y. Zheng, Q. Tan, C. Shu, Y. Liu and Z. Guo, J. Mater. Chem. A, 2017, 5, 22465
    DOI: 10.1039/C7TA08139A

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