期刊
CHEMICAL ENGINEERING JOURNAL
卷 373, 期 -, 页码 382-392出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.038
关键词
Pitch derived carbon; Yolk-shell structure; Porous carbon; Carbon microspheres; Lithium-sulfur batteries
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1D1A1B03034473, NRF-2017R1A4A1014806]
- National Research Foundation of Korea [2017R1D1A1B03034473] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Submicron and micron-sized carbon spheres with high electrical conductivity, micro-mesoporous structure, and empty space are considered ideal sulfur host materials for Li-S batteries. In this study, a new and efficient strategy for the synthesis of yolk-shell-structured carbon microspheres with multishells is introduced. Pitch-derived carbon microspheres with yolk-shell structure, high pore volume, and high electrical conductivity are synthesized by applying yolk-shell-structured Fe2O3 microspheres as a sacrificial template. Pitch-infiltrated Fe2O3 microspheres transform into yolk-shell-structured carbon (YS_C) microspheres with a specific conductivity of 0.9 S cm(-1) after post-treatment and etching with an HCl solution. The discharge capacity of the sulfur-loaded YS_C microspheres for the 200th cycle at a current density of 0.5 C is 686 mA h g(-1), and their reversible capacity after 800 cycles at a high current density of 2 C is 412 mA h g(-1). In addition, the sulfur-loaded YS_C microspheres show excellent cycling performance, despite their very high sulfur loading of 70 wt%. The excellent cycling and rate performances of the sulfur-loaded YS_C microspheres are attributed to the synergistic effect of the high electrical conductivity of YS_C microspheres, loading of amorphous and ultrafine sulfur, and empty shell layers.
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