期刊
ELECTROCHIMICA ACTA
卷 218, 期 -, 页码 243-251出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.09.130
关键词
cobalt sulfides; nanoparticles; polyhedrons; lithium-sulfur batteries
资金
- National Natural Science Fund of China [21471142, 21521001]
- Fundamental Research Funds for Central Universities [WK2060190053]
S/CoS2 nanoparticles-embedded N-doped carbon polyhedrons (S/CoS2-NC) as the cathode of lithium-sulfur battery are prepared. The synthesis is via the carbonization of metal organic frameworks polyhedron ZIF-67, followed by the heat treatment with sulfur. XRD confirms the existence of CoS2 and S, TEM shows the polyhedrons morphology and EDX mapping analysis displays the uniform distribution of Co, S and N in the carbon polyhedrons. As cathode for lithium-sulfur battery, S/CoS2-NC exhibit the enhanced cycling stability with the capacity of 702 mA h g(-1) at 0.5C after 250 cycles and rate performance, which is superior to S/Co nanoparticles-embedded N-doped carbon polyhedrons composites (S/Co-NC), S/N-doped carbon polyhedrons composites (S-NC) and the bare sulfur. When coupled with the Ge anode, the discharge capacity of 502 mA h g(-1) is obtained after 75 cycles at 0.5C. The enhanced property is mainly attributed to the synergistic effects of N-doped carbon polyhedrons and embedded CoS2. (C) 2016 Elsevier Ltd. All rights reserved.
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