MnO2/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries
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College of Material Science and Engineering, Liaoning Technical University, Fuxin 123000, China
2
College of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, China
3
College of Mining, Liaoning Technical University, Fuxin 123000, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Vivek Kumar and Charles C. Chusuei
Molecules 2020, 25(8), 1989; https://doi.org/10.3390/molecules25081989
Received: 30 March 2020
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Revised: 17 April 2020
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Accepted: 22 April 2020
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Published: 23 April 2020
(This article belongs to the Special Issue Electrochemistry of Low Dimensional and Nanostructured Carbon Materials: Applications in Sensing and Energy Storage)
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 MnO2, reduced graphene oxide (rGO), and carbon nanotubes (CNTs). The framework-structure composite of MnO2/rGO/CNTs is prepared by a simple hydrothermal method. The framework exhibits a uniform and abundant mesoporous structure (concentrating in ~12 nm). MnO2 is an α phase structure and the α-MnO2 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 MnO2/rGO/CNTs/S cathode delivered a high initial capacity of 1201 mAh g−1 at 0.2 C. The average capacities were 916 mAh g−1, 736 mAh g−1, and 547 mAh g−1 at the current densities of 0.5 C, 1 C, and 2 C, respectively. In addition, when tested at 0.5 C, the MnO2/rGO/CNTs/S exhibited a high initial capacity of 1010 mAh g−1 and achieved 780 mAh g−1 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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Keywords:
lithium sulfur battery; α-MnO2; carbon nanotubes; composites; cathode material
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MDPI and ACS Style
Dong, W.; Meng, L.; Hong, X.; Liu, S.; Shen, D.; Xia, Y.; Yang, S. MnO2/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries. Molecules 2020, 25, 1989. https://doi.org/10.3390/molecules25081989
AMA Style
Dong W, Meng L, Hong X, Liu S, Shen D, Xia Y, Yang S. MnO2/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries. Molecules. 2020; 25(8):1989. https://doi.org/10.3390/molecules25081989
Chicago/Turabian StyleDong, Wei, Lingqiang Meng, Xiaodong Hong, Sizhe Liu, Ding Shen, Yingkai Xia, and Shaobin Yang. 2020. "MnO2/rGO/CNTs Framework as a Sulfur Host for High-Performance Li-S Batteries" Molecules 25, no. 8: 1989. https://doi.org/10.3390/molecules25081989
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