Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201800587
Keywords
carbon materials; copper sulfides; lithium-ion batteries; metal-organic framework; nanocomposites
Categories
Funding
- Science Foundation Ireland (SFI) under the Principal Investigator Program [11- PI-1148]
- Science Foundation Ireland (SFI) [13/RP/B2549, 11-PI-1148]
- Enterprise Ireland [CF20144014]
- Irish Research Council through the Government of Ireland Postgraduate Scheme
- Irish Research Council [GOIPG/2016/1265]
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Li-ion batteries containing cost-effective, environmentally benign cathode materials with high specific capacities are in critical demand to deliver the energy density requirements of electric vehicles and next-generation electronic devices. Here, the phase-controlled synthesis of copper sulfide (CuxS) composites by the temperature-controlled sulfurization of a prototypal Cu metal-organic framework (MOF), HKUST-1 is reported. The tunable formation of different CuxS phases within a carbon network represents a simple method for the production of effective composite cathode materials for Li-ion batteries. A direct link between the sulfurization temperature of the MOF and the resultant CuxS phase formed with more Cu-rich phases favored at higher temperatures is further shown. The CuxS/C samples are characterized through X-ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy, and energy dispersive X-ray spectroscopy (EDX) in addition to testing as Li-ion cathodes. It is shown that the performance is dependent on both the CuxS phase and the crystal morphology with the Cu1.8S/C-500 material as a nanowire composite exhibiting the best performance, showing a specific capacity of 220 mAh g(-1) after 200 charge/discharge cycles.
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