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Highly Activated Carbon Nanotube Sponges Deposited with Sulfur for Lithium-sulfur Batteries |
ZHANG Ming, WANG Zhiyong, LUO Qin, DAI Zhengkun, LI Yesheng( ), WU Ziping( ) |
Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China |
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Cite this article:
ZHANG Ming, WANG Zhiyong, LUO Qin, DAI Zhengkun, LI Yesheng, WU Ziping. Highly Activated Carbon Nanotube Sponges Deposited with Sulfur for Lithium-sulfur Batteries. Chinese Journal of Materials Research, 2021, 35(1): 65-71.
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Abstract Carbon nanotubes (CNTs) prepared by CVD method are easily to attract and stack into sponges. The obtained CNT sponges (CNTS) show entangled networks, porosity and high activity. Due to these properties of the CNTS, sulfur vapor can deposite and nucleate on the CNT bundles to form electrode with tight contact structure, thereby high efficiency of electron transfer in the electrode and rate capability of battery based on the electrode can be realized. The distribution of sulfur and the structure of CNTs after sulfur deposition have been investigated through XRD, SEM, Raman spectroscopy and others. In addition, the electrochemical performances of the battery based on the electrode have been tested. The results show that the battery presents discharge specific capacity of 1250 mAh·g-1 at current density of 0.16 A·g-1, and the specific capacity is stable at 823 mAh·g-1 as the current density increased to 1.58 A·g-1, indicating a remarkable rate capability of the battery. Further, the cycling capacities of the battery have been also measured. The results show that the attenuation of each cycle capacity is only 0.22%, indicating an excellent cyclic stability of the battery based on the electrode.
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Received: 24 March 2020
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Fund: National Natural Science Foundation of China(51861009);Key Science and Technology Project of Jiangxi Provincial Department of Education(GJJ160596) |
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