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Fabrication of High Conductive S/C Cathode by Sulfur Infiltration into Hierarchical Porous Carbon/Carbon Fiber Weave-Structured Materials via Vapor-Melting Method

Authors Zhao, Zhenxia
Qin, Dan HKUST affiliated (currently or previously).
Wang, Sha HKUST affiliated (currently or previously).
Chen, Guohua View this author's profile
Li, Zhong
Issue Date 2014
Source Electrochimica Acta , v. 127, May 2014, p. 123-131
Summary A high-rate sulfur/carbon cathode is prepared by using high conductive hierarchical porous carbon-carbon fiber weave-structured (HPC-CF) materials as carbon host to disperse sulfur. Sulfur is infiltrated into porous carbon with meso/micropores by using an improved vapor-melting adsorption method, which aims to enhance sulfur dispersion and interaction with carbon host. Meanwhile, carbon fiber with weaved structure can connect the dispersed micron S/HPC particles on the current collector. As a result, a highly conductive network around the sulfur particles finally forms in the sulfur/carbon cathode. Results show that improved vapour-melting method can efficiently enhance the sulfur dispersion and interaction with carbon host. Electrochemical measurements show that both of the rate capacity and cycle stability of the sulfur/carbon cathode are significantly improved. It delivers a very high initial discharge capacity of 1692.9 mAh g(-1) at 0.1 C, and maintains 1030 mAh g(-1) after 130 cycles at 0.5 C. Furthermore, the weave-structured HPC-CF carbon materials increases the conductivity effectively, which enhances the rate performance of the prepared S/HPC-CF cathode. It shows 670.8 mAh g(-1) at the first cycle and remains 520 mAh g-1 after 200 cycles at 6.0 C with an average coulombic efficiency of 97.8%. The excellent cycle and rate performance of theprepared Sv-m/HPC-CF can be attributed to the high cathode conductivity, high sulfur utilization and strong interaction between sulfur and the HPC-CF materials. (C) 2014 Elsevier Ltd. All rights reserved.
ISSN 0013-4686
Language English
Format Article
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