Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries
Integrating a highly conductive carbon host and polar inorganic compounds has been widely reported to improve the electrochemical performances for promising low-cost lithium sulfur batteries. Herein, a MoS<sub>2</sub>/mesoporous carbon hollow sphere (MoS<sub>2</sub>/MCHS) str...
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| Format: | Article |
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MDPI AG
2019-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/9/9/1247 |
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| author | Yunyan Zhao Qianyu Zhuang Wenda Li Hongrui Peng Guicun Li Zhonghua Zhang |
| author_facet | Yunyan Zhao Qianyu Zhuang Wenda Li Hongrui Peng Guicun Li Zhonghua Zhang |
| author_sort | Yunyan Zhao |
| collection | DOAJ |
| description | Integrating a highly conductive carbon host and polar inorganic compounds has been widely reported to improve the electrochemical performances for promising low-cost lithium sulfur batteries. Herein, a MoS<sub>2</sub>/mesoporous carbon hollow sphere (MoS<sub>2</sub>/MCHS) structure has been proposed as an efficient sulfur cathode via a simple wet impregnation method and gas phase vulcanization method. Multi-fold structural merits have been demonstrated for the MoS<sub>2</sub>/MCHS structures. On one hand, the mesoporous carbon hollow sphere (MCHS) matrix, with abundant pore structures and high specific surface areas, could load a large amount of sulfur, improve the electronical conductivity of sulfur electrodes, and suppress the volume changes during the repeated sulfur conversion processes. On the other hand, ultrathin multi-layer MoS<sub>2</sub> nanosheets are revealed to be uniformly distributed in the mesoporous carbon hollow spheres, enhancing the physical adsorption and chemical entrapment functionalities towards the soluble polysulfide species. Having benefited from these structural advantages, the sulfur-impregnated MoS<sub>2</sub>/MCHS cathode presents remarkably improved electrochemical performances in terms of lower voltage polarization, higher reversible capacity (1094.3 mAh g<sup>−1</sup>), higher rate capability (590.2 mAh g<sup>−1</sup> at 2 C), and better cycling stability (556 mAh g<sup>−1</sup> after 400 cycles at 2 C) compared to the sulfur-impregnated MCHS cathode. This work offers a novel delicate design strategy for functional materials to achieve high performance lithium sulfur batteries. |
| first_indexed | 2024-12-11T22:55:11Z |
| format | Article |
| id | doaj.art-3514f11ddb934194b94564bc55fd971f |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-11T22:55:11Z |
| publishDate | 2019-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-3514f11ddb934194b94564bc55fd971f2022-12-22T00:47:17ZengMDPI AGNanomaterials2079-49912019-09-0199124710.3390/nano9091247nano9091247Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur BatteriesYunyan Zhao0Qianyu Zhuang1Wenda Li2Hongrui Peng3Guicun Li4Zhonghua Zhang5College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaCollege of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, ChinaIntegrating a highly conductive carbon host and polar inorganic compounds has been widely reported to improve the electrochemical performances for promising low-cost lithium sulfur batteries. Herein, a MoS<sub>2</sub>/mesoporous carbon hollow sphere (MoS<sub>2</sub>/MCHS) structure has been proposed as an efficient sulfur cathode via a simple wet impregnation method and gas phase vulcanization method. Multi-fold structural merits have been demonstrated for the MoS<sub>2</sub>/MCHS structures. On one hand, the mesoporous carbon hollow sphere (MCHS) matrix, with abundant pore structures and high specific surface areas, could load a large amount of sulfur, improve the electronical conductivity of sulfur electrodes, and suppress the volume changes during the repeated sulfur conversion processes. On the other hand, ultrathin multi-layer MoS<sub>2</sub> nanosheets are revealed to be uniformly distributed in the mesoporous carbon hollow spheres, enhancing the physical adsorption and chemical entrapment functionalities towards the soluble polysulfide species. Having benefited from these structural advantages, the sulfur-impregnated MoS<sub>2</sub>/MCHS cathode presents remarkably improved electrochemical performances in terms of lower voltage polarization, higher reversible capacity (1094.3 mAh g<sup>−1</sup>), higher rate capability (590.2 mAh g<sup>−1</sup> at 2 C), and better cycling stability (556 mAh g<sup>−1</sup> after 400 cycles at 2 C) compared to the sulfur-impregnated MCHS cathode. This work offers a novel delicate design strategy for functional materials to achieve high performance lithium sulfur batteries.https://www.mdpi.com/2079-4991/9/9/1247ultrathin few-layer MoS<sub>2</sub> nanosheetsmesoporous carbon hollow spheremulti-fold structurallithium sulfur batteries |
| spellingShingle | Yunyan Zhao Qianyu Zhuang Wenda Li Hongrui Peng Guicun Li Zhonghua Zhang Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries Nanomaterials ultrathin few-layer MoS<sub>2</sub> nanosheets mesoporous carbon hollow sphere multi-fold structural lithium sulfur batteries |
| title | Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries |
| title_full | Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries |
| title_fullStr | Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries |
| title_full_unstemmed | Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries |
| title_short | Encapsulation of Few-Layer MoS<sub>2</sub> in the Pores of Mesoporous Carbon Hollow Spheres for Lithium-Sulfur Batteries |
| title_sort | encapsulation of few layer mos sub 2 sub in the pores of mesoporous carbon hollow spheres for lithium sulfur batteries |
| topic | ultrathin few-layer MoS<sub>2</sub> nanosheets mesoporous carbon hollow sphere multi-fold structural lithium sulfur batteries |
| url | https://www.mdpi.com/2079-4991/9/9/1247 |
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