Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods
Lithium-sulfur (Li-S) battery is considered one of the possible alternatives for next-generation high energy batteries. However, its practical applications are still facing great challenges because of poor electronic conductivity, large volume change, and polysulfides dissolution inducing “shuttle r...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/4/861 |
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| author | Zhiqi Li Hao Sun Yuepeng Pang Mingming Yu Shiyou Zheng |
| author_facet | Zhiqi Li Hao Sun Yuepeng Pang Mingming Yu Shiyou Zheng |
| author_sort | Zhiqi Li |
| collection | DOAJ |
| description | Lithium-sulfur (Li-S) battery is considered one of the possible alternatives for next-generation high energy batteries. However, its practical applications are still facing great challenges because of poor electronic conductivity, large volume change, and polysulfides dissolution inducing “shuttle reaction” for the S cathode. Many strategies have been explored to alleviate the aforementioned concerns. The most common approach is to embed S into carbonaceous matrix for constructing C-S composite cathodes. Herein, we fabricate the C-S cathode reduced graphene oxide-S (rGO-S) composites via one step hydrothermal and in-situ thermal reduction methods. The structural features and electrochemical properties in Li-S cells of the two type rGO-S composites are studied systematically. The rGO-S composites prepared by one step hydrothermal method (rGO-S-HT) show relatively better comprehensive performance as compared with the ones by in-situ thermal reduction method (rGO-S-T). For instance, with a current density of 100 mA g<sup>−1</sup>, the rGO-S-HT composite cathodes possess an initial capacity of 1290 mAh g<sup>−1</sup> and simultaneously exhibit stable cycling capability. In particular, as increasing the current density to 1.0 A g<sup>−1</sup>, the rGO-S-HT cathode retains a reversible capacity of 582 mAh g<sup>−1</sup> even after 200 cycles. The enhanced electrochemical properties can be attributed to small S particles uniformly distributed on rGO sheets enabling to significantly improve the conductivity of S and effectively buffer large volume change during lithiation/delithiation. |
| first_indexed | 2024-03-09T04:44:01Z |
| format | Article |
| id | doaj.art-780a401e5131461d93ec15f7c8c3d1f8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:44:01Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-780a401e5131461d93ec15f7c8c3d1f82023-12-03T13:17:49ZengMDPI AGMaterials1996-19442021-02-0114486110.3390/ma14040861Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction MethodsZhiqi Li0Hao Sun1Yuepeng Pang2Mingming Yu3Shiyou Zheng4School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaResearch Center of Composite Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200000, ChinaSchool of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, ChinaLithium-sulfur (Li-S) battery is considered one of the possible alternatives for next-generation high energy batteries. However, its practical applications are still facing great challenges because of poor electronic conductivity, large volume change, and polysulfides dissolution inducing “shuttle reaction” for the S cathode. Many strategies have been explored to alleviate the aforementioned concerns. The most common approach is to embed S into carbonaceous matrix for constructing C-S composite cathodes. Herein, we fabricate the C-S cathode reduced graphene oxide-S (rGO-S) composites via one step hydrothermal and in-situ thermal reduction methods. The structural features and electrochemical properties in Li-S cells of the two type rGO-S composites are studied systematically. The rGO-S composites prepared by one step hydrothermal method (rGO-S-HT) show relatively better comprehensive performance as compared with the ones by in-situ thermal reduction method (rGO-S-T). For instance, with a current density of 100 mA g<sup>−1</sup>, the rGO-S-HT composite cathodes possess an initial capacity of 1290 mAh g<sup>−1</sup> and simultaneously exhibit stable cycling capability. In particular, as increasing the current density to 1.0 A g<sup>−1</sup>, the rGO-S-HT cathode retains a reversible capacity of 582 mAh g<sup>−1</sup> even after 200 cycles. The enhanced electrochemical properties can be attributed to small S particles uniformly distributed on rGO sheets enabling to significantly improve the conductivity of S and effectively buffer large volume change during lithiation/delithiation.https://www.mdpi.com/1996-1944/14/4/861reduced graphene oxidesulfurcompositebatteryLi-S battery |
| spellingShingle | Zhiqi Li Hao Sun Yuepeng Pang Mingming Yu Shiyou Zheng Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods Materials reduced graphene oxide sulfur composite battery Li-S battery |
| title | Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods |
| title_full | Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods |
| title_fullStr | Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods |
| title_full_unstemmed | Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods |
| title_short | Investigation on Fabrication of Reduced Graphene Oxide-Sulfur Composite Cathodes for Li-S Battery via Hydrothermal and Thermal Reduction Methods |
| title_sort | investigation on fabrication of reduced graphene oxide sulfur composite cathodes for li s battery via hydrothermal and thermal reduction methods |
| topic | reduced graphene oxide sulfur composite battery Li-S battery |
| url | https://www.mdpi.com/1996-1944/14/4/861 |
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