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Issue 16, 2018
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Ultrafast synthesis of amorphous VOx embedded into 3D strutted amorphous carbon frameworks–short-range order in dual-amorphous composites boosts lithium storage

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Abstract

Crystalline vanadium oxides have some unique advantages, including abundant material sources, high energy density, and a typical layered structure, making them promising anode candidates for lithium-ion batteries. However, the intrinsic low electrical conductivity and volume expansion side effects severely limit their capacity and cyclability at high charge/discharge rates. Herein, unique dual-amorphous composites with 3D strutted amorphous carbon sheet framework encapsulated amorphous vanadium oxide particles have been prepared by an ultrafast (within one minute), ultralow temperature (172 °C), one-step and large-scale combustion synthesis method. We demonstrate that the dual-amorphous VOx/C composites provide a large number of accessible active sites and defects for lithium ion intercalation/deintercalation and are self-accommodative to tolerate volume expansion. Another noteworthy point is the short-range ordered atomic arrangement observed in amorphous VOx that exhibits a larger interlayer spacing (d(001) = 4.80 Å) than other crystalline vanadium oxides. This particular structure has the potential to accommodate more lithium ions and tolerate the volume expansion. Meanwhile the 3D hierarchical porous sheet-like structure facilitates the transfer of electrons and lithium ions. The electrochemical measurements show excellent lithium storage performance with high capacity, good rate capability and long-term cycling stability of the composites.

Graphical abstract: Ultrafast synthesis of amorphous VOx embedded into 3D strutted amorphous carbon frameworks–short-range order in dual-amorphous composites boosts lithium storage

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Publication details

The article was received on 21 Jan 2018, accepted on 17 Mar 2018 and first published on 23 Mar 2018


Article type: Paper
DOI: 10.1039/C8TA00654G
Citation: J. Mater. Chem. A, 2018,6, 7053-7061
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    Ultrafast synthesis of amorphous VOx embedded into 3D strutted amorphous carbon frameworks–short-range order in dual-amorphous composites boosts lithium storage

    H. Wu, M. Qin, W. Wang, Z. Cao, Z. Liu, Q. Yu, C. Lao, D. Zhang, B. Jia, D. He, T. Liu, A. A. Volinsky, P. Cao and X. Qu, J. Mater. Chem. A, 2018, 6, 7053
    DOI: 10.1039/C8TA00654G

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