Optimizing Carbon-to-Sulfur Ratio in Polybenzoxazole-derived N-doped Carbon/Sulfur Cathodes for Lithium-Sulfur Batteries 


Vol. 26,  No. 6, pp. 2297-2304, Jun.  2025
10.1007/s12221-025-00979-0


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  Abstract

Lithium-sulfur batteries are promising candidates for next-generation energy storage systems due to their high theoretical energy density and cost-effectiveness. However, challenges such as poor sulfur conductivity, polysulfide shuttling, and capacity degradation remain significant barriers to commercialization. This study investigates the role of carbon-to-sulfur ratios in optimizing the electrochemical performance of nitrogen-doped carbon cathodes. By characterizing the physical and chemical properties of polybenzoxazole-derived carbon structures and their sulfur mixture, we identify the optimal carbon-to-sulfur ratio that balances electronic conductivity, sulfur utilization, and polysulfide suppression. Electrochemical analyses, including cyclic voltammetry, charge–discharge behavior, and impedance spectroscopy, reveal that a carbon-to-sulfur ratio of 10:1 achieves superior performance, with improved charge transfer, enhanced sulfur conversion efficiency, and minimized polysulfide shuttle effects. These findings provide valuable insights into material design strategies for high-performance lithium-sulfur batteries.

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  Cite this article

[IEEE Style]

B. Lee, Y. Chun, H. Y. Choi, C. S. Kang, D. H. Baik, "Optimizing Carbon-to-Sulfur Ratio in Polybenzoxazole-derived N-doped Carbon/Sulfur Cathodes for Lithium-Sulfur Batteries," Fibers and Polymers, vol. 26, no. 6, pp. 2297-2304, 2025. DOI: 10.1007/s12221-025-00979-0.

[ACM Style]

Byoung-Min Lee, Youngsang Chun, Hyeong Yeol Choi, Chan Sol Kang, and Doo Hyun Baik. 2025. Optimizing Carbon-to-Sulfur Ratio in Polybenzoxazole-derived N-doped Carbon/Sulfur Cathodes for Lithium-Sulfur Batteries. Fibers and Polymers, 26, 6, (2025), 2297-2304. DOI: 10.1007/s12221-025-00979-0.

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pISSN : 1229 - 9197
eISSN : 1875 - 0052

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