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Sulfur/Polythiophene with a Core/Shell Structure: Synthesis and Electrochemical Properties of the Cathode for Rechargeable Lithium Batteries
Abstract
Novel sulfur/polythiophene composites with core/shell structure composites were synthesized via an in situ chemical oxidative polymerization method with chloroform as a solvent, thiophene as a reagent, and iron chloride as an oxidant at 0 °C. Different ratios of the sulfur/polythiophene composites were characterized by elemental analysis, FTIR, XRD, SEM, TEM, and electrochemical methods. A suitable ratio for the composites was found to be 71.9% sulfur and 18.1% polythiophene as determined by CV and EIS results. Conductive polythiophene acts as a conducting additive and a porous adsorbing agent. It was uniformly coated onto the surface of the sulfur powder to form a core/shell structure, which effectively enhances the electrochemical performance and cycle life of the sulfur cells. The initial discharge capacity of the active material was 1119.3 mA h g −1, sulfur and the remaining capacity was 830.2 mA h g −1 sulfur after 80 cycles. After a rate test from 100 to 1600 mA g −1 sulfur, the cell remained at 811 mA h g −1 sulfur after 60 cycles when the current density returned to 100 mA g −1 sulfur. The sulfur utilization, the cycle life, and the rate performance of the S−PTh core/shell electrode in a lithium−sulfur battery improved significantly compared to that of the pure sulfur electrode. The pore and thickness of the shell affected the battery performance of the lithium ion diffusion channels.
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Metadata
- Authors
- Wu, F., Chen, J., Chen, R., Wu, S., Li, L., Chen, S., & Zhao, T.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-03-16
- Volume
- 115
- Issue
- 13
- Pages
- 6057-6063
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2057587650
- Cited by
- 520
- References
- 0
- FWCI
- 34.76
- Type
- journal article
- Language
- en
- Open access
- closed
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