期刊
ELECTROCHIMICA ACTA
卷 143, 期 -, 页码 49-55出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.07.148
关键词
Hierarchical porous structure; Lithium/Sulfur battery; Nanostructured sulfur cathode; Sulfur/Polypyrrole/Multiwalled carbon; nanotube composite
资金
- Positec
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Canada Research Chairs (CRC) program
- NSERC
- Nazarbayev University Research and Innovation Systems (NURIS, Kazakhstan)
- Nazarbayev University
A novel porous sulfur/polypyrrole/multiwalled carbon nanotube composite (S/PPy/MWNT) was synthesized via in situ polymerization of pyrrole monomer with nano-sulfur and MWNT aqueous suspension followed by a low temperature heat-treatment. Scanning electronic microscopy revealed the formation of a highly hierarchical mesoporous and macroporous structure. High resolution transmission electronic microscopy confirmed homogeneous dispersion of S, PPy and MWNT in the composite. In this composite, polypyrrole with its high adhesion ability to MWNT acts as a conductive binder to connect sulfur and MWNT matrix, as well as absorbs polysulfides into its porous structure positively affecting the composite performance as a cathode in a Li/S cell. The resulting S/PPy/MWNT composite cathode exhibited greatly enhanced cyclability and delivered a reversible discharge capacity of 751 mAh g(-1) after 100 cycles at 0.2 C. (C) 2014 Elsevier Ltd. All rights reserved.
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