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The design and preparation of the composite with layered spherical structure for Li-S battery

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Abstract

The composite of polythiophene/sulfur/Ketjen black with the layered spherical structure was designed and prepared to reduce the loss of active material and weaken the “shuttle effect” of polysulfides in Li-S battery. Ketjen black particle, which serves as conductive carbon core, was firstly coated by sulfur layer, and then sulfur/carbon particle was wrapped by polythiophene layer through in situ polymerization procedure. The structure, conductive properties, and electrochemical performance of composites with different polymerization times were investigated. Results show that the 10-h composite presents both the highest electronic conductivity of 4.51 × 10−3 S cm−1 and the highest ionic conductivity of 8.72 × 10−12 cm2 s−1. Moreover, it also exhibits the best electrochemical performance as the cathode material in Li-S battery. The conducting polythiophene with lithium storage ability contributes to improve the electrochemical activity of sulfur. Besides, due to its coating function, the dissolution loss and the “shuttle effect” of polysulfides are suppressed to a certain extent.

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Acknowledgements

This study was supported under the Jiangsu Natural Science Funds (BK20160944) and the Startup Foundation for Introducing Talent of NUIST (2015r048).

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Authors and Affiliations

  1. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Longyan Li

  2. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Longyan Li

  3. College of Chemical Engineering, Sichuan University, Chengdu, 610065, China

    Benhe Zhong

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  1. Longyan Li
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  2. Benhe Zhong
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Correspondence to Longyan Li.

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Li, L., Zhong, B. The design and preparation of the composite with layered spherical structure for Li-S battery. J Solid State Electrochem 22, 591–598 (2018). https://doi.org/10.1007/s10008-017-3787-9

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  • DOI: https://doi.org/10.1007/s10008-017-3787-9

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