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Title: In situ nitrogenated graphene-few-layer WS2 composites for fast and reversible Li+ storage
Authors: Chen, D.
Ji, G.
Ding, B.
Ma, Y.
Qu, B.
Chen, W.
Lee, J.Y. 
Issue Date: 7-Sep-2013
Source: Chen, D., Ji, G., Ding, B., Ma, Y., Qu, B., Chen, W., Lee, J.Y. (2013-09-07). In situ nitrogenated graphene-few-layer WS2 composites for fast and reversible Li+ storage. Nanoscale 5 (17) : 7890-7896. ScholarBank@NUS Repository.
Abstract: Two-dimensional nanosheets can leverage on their open architecture to support facile insertion and removal of Li+ as lithium-ion battery electrode materials. In this study, two two-dimensional nanosheets with complementary functions, namely nitrogen-doped graphene and few-layer WS 2, were integrated via a facile surfactant-assisted synthesis under hydrothermal conditions. The layer structure and morphology of the composites were confirmed by X-ray diffraction, scanning electron microscopy and high-resolution transmission microscopy. The effects of surfactant amount on the WS2 layer number were investigated and the performance of the layered composites as high energy density lithium-ion battery anodes was evaluated. The composite formed with a surfactant:tungsten precursor ratio of 1:1 delivered the best cyclability (average of only 0.08% capacity fade per cycle for 100 cycles) and good rate performance (80% capacity retention with a 50-fold increase in current density from 100 mA g-1 to 5000 mA g -1), and may find uses in power-oriented applications. © 2013 The Royal Society of Chemistry.
Source Title: Nanoscale
ISSN: 20403364
DOI: 10.1039/c3nr02920d
Appears in Collections:Staff Publications

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