Sulfur/polythiophene with a core/shell structure: Synthesis and electrochemical properties of the cathode for rechargeable lithium batteries

Feng Wu, Junzheng Chen, Renjie Chen*, Shengxian Wu, Li Li, Shi Chen, Teng Zhao

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

512 引用 (Scopus)

摘要

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.

源语言英语
页(从-至)6057-6063
页数7
期刊Journal of Physical Chemistry C
115
13
DOI
出版状态已出版 - 7 4月 2011

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Wu, F., Chen, J., Chen, R., Wu, S., Li, L., Chen, S., & Zhao, T. (2011). Sulfur/polythiophene with a core/shell structure: Synthesis and electrochemical properties of the cathode for rechargeable lithium batteries. Journal of Physical Chemistry C, 115(13), 6057-6063. https://doi.org/10.1021/jp1114724