期刊
SOLID STATE IONICS
卷 238, 期 -, 页码 30-35出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2013.03.006
关键词
Sulfur/polypyrrole/MWNT composite; Lithium-sulfur battery; Core-shell tubular structure
资金
- Positec
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Canada Research Chairs (CRC) Program
- NSERC
- China Scholarship Council
A multi-walled carbon nanotube and polypyrrole composite (PPy/MWNT) was synthesized by in situ polymerization of pyrrole monomer on the surface of MWNT. As-prepared PPy/MWNT composite was mixed with an aqueous suspension of nanosized sulfur particle, followed by heat-treatment to obtain an S/PPy/MWNT ternary composite. High resolution transmission electronic microscopy shows the formation of a highly developed core-shell tubular structure consisting of PPy/MWNT composite with uniform sulfur coating on its surface. Polypyrrole, with its high adhesion ability to MWNT, acts as a binder to connect sulfur and MWNTs, as well as absorbs polysulfides into its porous structure to improve the cyclability of the S/PPy/MWNT composite in Li/S batteries. The MWNT core provides a highly conductive and mechanically flexible framework, enhancing the electronic conductivity and consequently the rate capability of the material. This ternary composite cathode sustains 960.7 mAh g(-1) reversible specific discharge capacity after 40 cycles at 0.1 C, and 523.2 mAh g(-1) at 0.5 C. (C) 2013 Elsevier B.V. All rights reserved.
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