Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries

doi:10.1016/S2095-4956(14)60152-2

能源化学(英文) ›› 2014, Vol. 23 ›› Issue (3): 308-314.DOI: 10.1016/S2095-4956(14)60152-2

Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries

Juan Zhang, Huan Ye, Yaxia Yin, Yuguo Guo

Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2013-11-04 修回日期:2013-12-05 出版日期:2014-05-24 发布日期:2014-05-25
通讯作者: Yuguo Guo
基金资助:
This work was supported by the National Natural Science Foundation of China (Grant No. 51225204, 91127044, U1301244 and 21121063), the National Key Project on Basic Research (Grant No. 2011CB935700, 2013AA050903 and 2012CB932900), and the "Strategic Priority Research Program" of CAS (Grant No. XDA09010300).

Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries

Juan Zhang, Huan Ye, Yaxia Yin, Yuguo Guo

Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-11-04 Revised:2013-12-05 Online:2014-05-24 Published:2014-05-25
Supported by:
This work was supported by the National Natural Science Foundation of China (Grant No. 51225204, 91127044, U1301244 and 21121063), the National Key Project on Basic Research (Grant No. 2011CB935700, 2013AA050903 and 2012CB932900), and the "Strategic Priority Research Program" of CAS (Grant No. XDA09010300).

摘要/Abstract

摘要： Lithium-sulfur (Li-S) batteries belong to one of the promising technologies for high-energy-density rechargeable batteries. However, sulfur cathodes suffer from inherent problems of its poor electronic conductivity and the shuttling of highly dissoluble lithium polysulfides generated during the cycles. Loading sulfur into porous carbons has been proved to be an effective approach to alleviate these issues. Mesoporous and microporous carbons have been widely used for sulfur accommodation, but mesoporous carbons have poor sulfur confinement, whereas microporous carbons are impeded by low sulfur loading rates. Here, a core-shell carbon, combining both the merits of mesoporous carbon with large pore volume and microporous carbon with effective sulfur confinement, was prepared by coating the mesoporous CMK-3 with a microporous carbon (MPC) shell and served as the carbon host (CMK-3@MPC) to accommodate sulfur. After sulfur infusion, the as-obtained S/(CMK-3@MPC) cathode delivered a high initial capacity of up to 1422 mAh·g^-1 and sustained 654 mAh·g^-1 reversible specific capacity after 36 cycles at 0.1 C. The good performance is ascribed to the unique core-shell structure of the CMK-3@MPC matrix, in which sulfur can be effectively confined within the meso/microporous carbon host, thus achieving simultaneously high electrochemical utilization.

关键词: core-shell structure, microporous carbon coating, mesoporous carbon, lithium-sulfur batteries, sulfur cathode

Abstract: Lithium-sulfur (Li-S) batteries belong to one of the promising technologies for high-energy-density rechargeable batteries. However, sulfur cathodes suffer from inherent problems of its poor electronic conductivity and the shuttling of highly dissoluble lithium polysulfides generated during the cycles. Loading sulfur into porous carbons has been proved to be an effective approach to alleviate these issues. Mesoporous and microporous carbons have been widely used for sulfur accommodation, but mesoporous carbons have poor sulfur confinement, whereas microporous carbons are impeded by low sulfur loading rates. Here, a core-shell carbon, combining both the merits of mesoporous carbon with large pore volume and microporous carbon with effective sulfur confinement, was prepared by coating the mesoporous CMK-3 with a microporous carbon (MPC) shell and served as the carbon host (CMK-3@MPC) to accommodate sulfur. After sulfur infusion, the as-obtained S/(CMK-3@MPC) cathode delivered a high initial capacity of up to 1422 mAh·g^-1 and sustained 654 mAh·g^-1 reversible specific capacity after 36 cycles at 0.1 C. The good performance is ascribed to the unique core-shell structure of the CMK-3@MPC matrix, in which sulfur can be effectively confined within the meso/microporous carbon host, thus achieving simultaneously high electrochemical utilization.

Key words: core-shell structure, microporous carbon coating, mesoporous carbon, lithium-sulfur batteries, sulfur cathode

Juan Zhang, Huan Ye, Yaxia Yin, Yuguo Guo. Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries[J]. 能源化学(英文), 2014, 23(3): 308-314.

Juan Zhang, Huan Ye, Yaxia Yin, Yuguo Guo. Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries[J]. Journal of Energy Chemistry, 2014, 23(3): 308-314.

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Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries

Core-shell meso/microporous carbon host for sulfur loading toward applications in lithium-sulfur batteries

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