Synthesis and electrochemical performance of S/mesoporous carbon microsphere-MoS<sub>2</sub> cathode materials

TAO Ying-qing; KONG Zhen-kai; WEI Yan-ju; WANG Ji-tong; QIAO Wen-ming; LING Li-cheng

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Article Navigation > New Carbon Mater. > 2019 > 34(4): 349-357

TAO Ying-qing, KONG Zhen-kai, WEI Yan-ju, WANG Ji-tong, QIAO Wen-ming, LING Li-cheng. Synthesis and electrochemical performance of S/mesoporous carbon microsphere-MoS2 cathode materials. New Carbon Mater., 2019, 34(4): 349-357.

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TAO Ying-qing, KONG Zhen-kai, WEI Yan-ju, WANG Ji-tong, QIAO Wen-ming, LING Li-cheng. Synthesis and electrochemical performance of S/mesoporous carbon microsphere-MoS₂ cathode materials. New Carbon Mater., 2019, 34(4): 349-357.

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Synthesis and electrochemical performance of S/mesoporous carbon microsphere-MoS₂ cathode materials

1.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2.
Key Laboratory of Specially Functional Polymeric Materials and Related Technology(ECUST), Ministry of Education, Shanghai 200237, China

Funds: National Natural Science Foundation of China (U1710252, 21506061); Fundamental Research Funds for the Central Universities (50321041917001).

Received Date: 2019-03-03
Accepted Date: 2019-09-10
Rev Recd Date: 2019-07-28
Publish Date: 2019-08-28

Abstract

Abstract

The commercial uses of Li-S batteries are still greatly limited by a number of obstacles such as the insulating nature of sulfur and its discharge products, the shuttling of intermediate polysulfides and the large volume change of sulfur during cycling. Here, we attached polar MoS₂ to a well-developed mesoporous carbon microsphere (MCM) framework and used this as a highly efficient host for the sulfur cathode. Compared with a S/MCM cathode, the S/MCM-MoS₂ cathode provided a higher discharge capacity, improved cycling stability and rate performance with an optimum MoS₂ content of 12.4 wt.%. MoS₂ is electrochemically active within the working voltage range of the sulfur cathode, which contributes extra capacity to the sulfur cathode with a stable cycling performance without loss of capacity in a 1 M LiTFSI electrolyte. The replacement of some of the electrochemically inactive carbon with MoS₂ also increases the overall energy density. The exploration of such an electrochemically active host material may provide a new possibility for improving the electrochemical performance of Li-S batteries.
- Mesoporous carbon microsphere,
- Lithium-sulfur battery,
- Sulfur cathode,
- MoS₂,
- Electrochemistry

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References(20)

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