Journal
JOURNAL OF POWER SOURCES
Volume 251, Issue -, Pages 331-337Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.11.062
Keywords
Lithium; Sulfide; Battery; Polysulfide; Cathode
Funding
- U.S. Department of Energy, Basic Energy Sciences [DE-ACO2-06CH11357]
- China Scholarship Council and Hunan Provincial Innovation Foundation for Postgraduate
- National Natural Science Foundation of China [21276284]
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A lithium sulfide-reduced graphene oxide nanocomposite (Li2S-rGO) was synthesized and evaluated as the cathode material and Li source for the assembly of Li-S batteries. The composite, with a unique 3-D pocket structure, was synthesized by a combination of facile solution chemistry and thermal treatment. The as-prepared Li2S-rGO nanocomposites were characterized by X-ray photoelectron spectroscopy, Xray diffraction and scanning electron microscopy, which showed 20-40 nm Li2S particles homogeneously dispersed between reduced graphene oxide sheets. Li2S contents as high as similar to 66% could be obtained. When used with an electrolyte containing LiNO3 and polysulfide, the Li2S-rGO nanocomposites exhibited a high initial capacity of 982 mAh g(-1) Li2S. However, there was noticeable capacity fade in subsequent cycles, probably due to polysulfide dissolution and the shuttle mechanism, but a capacity of 315 mAh g(-1) could still be obtained after 100 cycles, with 90-95% coulomb efficiency. The effect of polysulfide additive in the electrolyte on the activation of Li2S in the first delithiation step was discussed. (C) 2013 Elsevier B.V. All rights reserved.
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