Rational Design Oxygen and Sulfur Dual-Doped 3D Hierarchical Porous Carbons for High-Performance Lithium-Sulfur Batteries

Oxygen and sulfur dual-doped 3D interconnected hierarchical porous carbons (HPCs) were synthesized via pyrolysis followed by chemical activation of natural alginate. The results showed that both an appropriate poristy and high level of S doping lead to the excellent electrochemical performance. The...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2018-01, Vol.165 (2), p.A31-A39
Main Authors: Cao, Zhaoxia, Zhang, Ruirui, Shi, Mengjiao, Zhu, Guangshuang, Yang, Mingguo, Zhang, Huishuang, Qiao, Yun, Yang, Shuting
Format: Article
Language:English
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Summary:Oxygen and sulfur dual-doped 3D interconnected hierarchical porous carbons (HPCs) were synthesized via pyrolysis followed by chemical activation of natural alginate. The results showed that both an appropriate poristy and high level of S doping lead to the excellent electrochemical performance. The optimal HPC-Na-900/S composite exhibited outstanding electrochemical performance as cathode materials for Li-S batteries. Specially, the electrochemical performances of the resultant HPC/S composites change randomly with the surface area, pore volume except porosity and surface chemistry under the testing conditions. The porosity plays a more important role than surface area as well as pore volume which are the crucial parameters in designing of porous carbon, and only the ratio of these hierarchical pores reaches a specific range, the best battery performance can be achieved. The introduction of heteroatom are also key factors that determines the performance of lithium-sulfur batteries. This insight into the relation of microstructure and surface chemistry with battery performance can help to guide better understand and rationally design porous carbon hosts.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.0041802jes