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VO2(B)/Graphene Forest for High-Rate Li-Ion Battery

Published online by Cambridge University Press:  28 May 2015

Guofeng Ren  and
Zhaoyang Fan
Guofeng Ren
Affiliation:
Department of Electrical and Computer Engineering and Nano Tech Center, Texas Tech University, Lubbock, Texas 79409, USA
Zhaoyang Fan
Affiliation:
Department of Electrical and Computer Engineering and Nano Tech Center, Texas Tech University, Lubbock, Texas 79409, USA
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Abstract

2D nanomaterials, when assembled into an ordered macrostructure, will present many great opportunities, including for Li-ion batteries (LIBs). We report densely-packed vertically-aligned VO2(B) nanobelts (NBs)-based forest structure synthesized on edge-oriented graphene (EOG) network. Using a EOG/Ni foam as a 3D scaffold, aligned VO2(B) NBs can be further synthesized into a folded 3D forest structure to construct a freestanding electrode for LIBs. Electrochemical studies found that such a freestanding VO2(B)/EOG electrode, which combines the unique merits of 2D VO2(B) NBs and 2D graphene sheets, has excellent charge-discharge rate performance. A discharge capacity of 178 mAh g-1 at a rate of 59 C and 100 mAh g-1 at 300 C was measured. A good charge-discharge cycling stability under a high current density was also demonstrated. The results indicate VO2(B)/EOG forest based freestanding electrode is very promising for developing high-rate LIBs.

Keywords

energy storagenanostructurehydrothermal
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1773: Symposium G – Next Generation Electrochemical Energy Storage and Conversion Systems―Synthesis, Processing, Characterization and Manufacturing , 2015 , pp. 7 - 14
Copyright
Copyright © Materials Research Society 2015 

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References

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