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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

Abstract

Spinel ZnFe2O4 (ZFO) is recently gaining prominence as a fascinating anode for Li-ion batteries (LIBs) owing to its intrinsic metrits. However, serious electrode pulverization and modest electric conductivity hugely hinder its commercial applications. Herein, we deliberately fabricate a multi-functional yolk-shell hollow architecture, desinged as H-ZFO-C@void@C, where hollow ZFO sub-microspheres with internal well-distributed carbon network are template-freely prepared as a yolk, along with the conductive N-doped carbon nanoshell and functional void interspace. Structural/geometric simulation and experiments confirm that our well-defined internal void and hollow interior of the yolk can efficiently accommodate volumetric expansion over lithiation without breaking the outer nanoshell meanwhile, ensuring the good yolk-shell electronic contact and thin yet stable solid-electrolyte-interphase on the outer surface. The conducting nano-carbon shell and internal continuous carbon network prevent serious aggregation of nano-ZFO subunits, and facilitate convenient charge transfer during repeatedly lithiation/delithiation processes. Benefitting from synergetic contributions from these appealing design rationales, our intergrated H-ZFO-C@void@C anode delivers high initial Coloumbic efficiency of ~76.8%, remarkable reversible capacity of ~775 mAh 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.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8TA04347G

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