MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries
Lithium-sulfur batteries are very promising next-generation energy storage batteries due to their high theoretical specific capacity. However, the shuttle effect of lithium-sulfur batteries is one of the important bottlenecks that limits its rapid development. Herein, physical and chemical dual adso...
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| Format: | Article |
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MDPI AG
2020-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/25/8/1989 |
| _version_ | 1797569810932957184 |
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| author | Wei Dong Lingqiang Meng Xiaodong Hong Sizhe Liu Ding Shen Yingkai Xia Shaobin Yang |
| author_facet | Wei Dong Lingqiang Meng Xiaodong Hong Sizhe Liu Ding Shen Yingkai Xia Shaobin Yang |
| author_sort | Wei Dong |
| collection | DOAJ |
| description | Lithium-sulfur batteries are very promising next-generation energy storage batteries due to their high theoretical specific capacity. However, the shuttle effect of lithium-sulfur batteries is one of the important bottlenecks that limits its rapid development. Herein, physical and chemical dual adsorption of lithium polysulfides are achieved by designing a novel framework structure consisting of MnO<sub>2</sub>, reduced graphene oxide (rGO), and carbon nanotubes (CNTs). The framework-structure composite of MnO<sub>2</sub>/rGO/CNTs is prepared by a simple hydrothermal method. The framework exhibits a uniform and abundant mesoporous structure (concentrating in ~12 nm). MnO<sub>2</sub> is an α phase structure and the α-MnO<sub>2</sub> also has a significant effect on the adsorption of lithium polysulfides. The rGO and CNTs provide a good physical adsorption interaction and good electronic conductivity for the dissolved polysulfides. As a result, the MnO<sub>2</sub>/rGO/CNTs/S cathode delivered a high initial capacity of 1201 mAh g<sup>−1</sup> at 0.2 C. The average capacities were 916 mAh g<sup>−1</sup>, 736 mAh g<sup>−1</sup>, and 547 mAh g<sup>−1</sup> at the current densities of 0.5 C, 1 C, and 2 C, respectively. In addition, when tested at 0.5 C, the MnO<sub>2</sub>/rGO/CNTs/S exhibited a high initial capacity of 1010 mAh g<sup>−1</sup> and achieved 780 mAh g<sup>−1</sup> after 200 cycles, with a low capacity decay rate of 0.11% per cycle. This framework-structure composite provides a simple way to improve the electrochemical performance of Li-S batteries. |
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| language | English |
| last_indexed | 2024-03-10T20:16:50Z |
| publishDate | 2020-04-01 |
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| series | Molecules |
| spelling | doaj.art-dd00e954f21248108ad4bc9f8efc014e2023-11-19T22:33:25ZengMDPI AGMolecules1420-30492020-04-01258198910.3390/molecules25081989MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S BatteriesWei Dong0Lingqiang Meng1Xiaodong Hong2Sizhe Liu3Ding Shen4Yingkai Xia5Shaobin Yang6College of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mining, Liaoning Technical University, Fuxin 123000, ChinaCollege of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, ChinaLithium-sulfur batteries are very promising next-generation energy storage batteries due to their high theoretical specific capacity. However, the shuttle effect of lithium-sulfur batteries is one of the important bottlenecks that limits its rapid development. Herein, physical and chemical dual adsorption of lithium polysulfides are achieved by designing a novel framework structure consisting of MnO<sub>2</sub>, reduced graphene oxide (rGO), and carbon nanotubes (CNTs). The framework-structure composite of MnO<sub>2</sub>/rGO/CNTs is prepared by a simple hydrothermal method. The framework exhibits a uniform and abundant mesoporous structure (concentrating in ~12 nm). MnO<sub>2</sub> is an α phase structure and the α-MnO<sub>2</sub> also has a significant effect on the adsorption of lithium polysulfides. The rGO and CNTs provide a good physical adsorption interaction and good electronic conductivity for the dissolved polysulfides. As a result, the MnO<sub>2</sub>/rGO/CNTs/S cathode delivered a high initial capacity of 1201 mAh g<sup>−1</sup> at 0.2 C. The average capacities were 916 mAh g<sup>−1</sup>, 736 mAh g<sup>−1</sup>, and 547 mAh g<sup>−1</sup> at the current densities of 0.5 C, 1 C, and 2 C, respectively. In addition, when tested at 0.5 C, the MnO<sub>2</sub>/rGO/CNTs/S exhibited a high initial capacity of 1010 mAh g<sup>−1</sup> and achieved 780 mAh g<sup>−1</sup> after 200 cycles, with a low capacity decay rate of 0.11% per cycle. This framework-structure composite provides a simple way to improve the electrochemical performance of Li-S batteries.https://www.mdpi.com/1420-3049/25/8/1989lithium sulfur batteryα-MnO<sub>2</sub>carbon nanotubescompositescathode material |
| spellingShingle | Wei Dong Lingqiang Meng Xiaodong Hong Sizhe Liu Ding Shen Yingkai Xia Shaobin Yang MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries Molecules lithium sulfur battery α-MnO<sub>2</sub> carbon nanotubes composites cathode material |
| title | MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries |
| title_full | MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries |
| title_fullStr | MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries |
| title_full_unstemmed | MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries |
| title_short | MnO<sub>2</sub>/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries |
| title_sort | mno sub 2 sub rgo cnts framework as a sulfur host for high performance li s batteries |
| topic | lithium sulfur battery α-MnO<sub>2</sub> carbon nanotubes composites cathode material |
| url | https://www.mdpi.com/1420-3049/25/8/1989 |
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