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Issue 37, 2018
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Structure-designed synthesis of yolk–shell hollow ZnFe2O4/C@N-doped carbon sub-microspheres as a competitive anode for high-performance Li-ion batteries

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Abstract

Spinel ZnFe2O4 (ZFO) has recently gained prominence as a fascinating anode for lithium-ion batteries (LIBs) owing to its intrinsic merits. However, serious electrode pulverization and modest electrical conductivity hugely hinder its commercial application. Herein, we describe the deliberate fabrication of a multi-functional yolk–shell hollow architecture, designated as H-ZFO–C@void@C, where hollow ZFO sub-microspheres with an internal well-distributed carbon network were prepared in a template-free manner as a yolk, along with a conductive N-doped carbon nanoshell and functional void interspace. Structural/geometric simulations and experiments confirm that the well-defined internal void and hollow interior of the yolk can efficiently accommodate volumetric expansion over lithiation without breaking the outer nanoshell while ensuring good yolk–shell electronic contact and a thin yet stable solid–electrolyte-interphase film on the outer surface. The conducting nano-carbon shell and continuous internal carbon network prevent the serious aggregation of nano-ZFO subunits, and facilitate convenient charge transfer during repeated lithiation/delithiation processes. Benefiting from the synergetic contributions of these appealing design rationales, our integrated H-ZFO–C@void@C anode delivers a high initial coulombic efficiency of ∼76.8%, a remarkable reversible capacity of ∼775 mA h g−1 at 2000 mA g−1, and long-term cyclability after 500 cycles at a high rate of 1000 mA g−1. More promisingly, our design here offers a competitive metal oxide-based anode structure for advanced LIBs.

Graphical abstract: Structure-designed synthesis of yolk–shell hollow ZnFe2O4/C@N-doped carbon sub-microspheres as a competitive anode for high-performance Li-ion batteries

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Publication details

The article was received on 10 May 2018, accepted on 11 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04347G
Citation: J. Mater. Chem. A, 2018,6, 17947-17958
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    Structure-designed synthesis of yolk–shell hollow ZnFe2O4/C@N-doped carbon sub-microspheres as a competitive anode for high-performance Li-ion batteries

    L. Hou, R. Bao, Y. Zhang, X. Sun, J. Zhang, H. Dou, X. Zhang and C. Yuan, J. Mater. Chem. A, 2018, 6, 17947
    DOI: 10.1039/C8TA04347G

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