Title

Simple in situ synthesis of carbon-supported and nanosheet-assembled vanadium oxide for ultra-high rate anode and cathode materials of lithium ion batteries

RIS ID

109664

Publication Details

Wang, X., Jia, W., Wang, L., Huang, Y., Guo, Y., Sun, Y., Jia, D., Pang, W. Kong., Guo, Z. & Tang, X. (2016). Simple in situ synthesis of carbon-supported and nanosheet-assembled vanadium oxide for ultra-high rate anode and cathode materials of lithium ion batteries. Journal of Materials Chemistry A, 4 (36), 13907-13915.

Abstract

A simple and efficient precipitation method has been developed for the in situ synthesis of a two-dimensional vanadium oxide@carbon nanosheet (2D V2O5@C NS). The crystalline structure, morphology and electrochemical performance of the as-prepared material were characterized systematically. The results demonstrate that the thickness of nanosheet is about 50 nm, and a thin C shell is successfully coated in situ on the surface of the V2O5 NS core. Benefiting from the intrinsic increased conductivity of the 2D V2O5@C NS and its robust NS structure, when the as-synthesized material is used as an anode material, it exhibits large reversible discharge capacity (860 mA h g-1 at 0.5 A g-1), good cycling performance (a high capacity of 802 mA h g-1 at 1.0 A g-1 after 200 cycles) and an ultra-high rate capability (reversible capabilities of 705 mA h g-1 at 2.0 A g-1, and 554 mA h g-1 at 3.0 A g-1). As a cathode material, the material also shows superior rate performance (reversible capabilities of 189, 166, 147, 139, 132, and 126 mA h g-1 at 0.1, 0.2, 0.5, 0.8, 1.0, and 1.2 A g-1, respectively). This work demonstrates a novel method for preparing vanadium-based NS material for high-performance lithium ion batteries.

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Link to publisher version (DOI)

http://dx.doi.org/10.1039/c6ta05091c