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An encapsulation-reduction-catalysis confined all-in-one microcapsule for lithium-sulfur batteries displaying a high capacity and stable temperature tolerance

Authors
  • Zhu, Mengfei
  • Yang, Chaoyu
  • Han, Tianli
  • Hu, Chaoquan
  • Wu, Yong
  • Si, Ting
  • Liu, Jinyun
Publication Date
Apr 27, 2021
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
License
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Abstract

Developing emerging host materials for constructing high energy-density lithium-sulfur (Li-S) batteries has received extensive attention. Herein, we develop a carbon nanotube (CNT)/S-infilled all-in-one microcapsule for Li-S batteries by catalytically growing CNTs using reduced Co3O4 nanoboxes inside a microcapsule. The encapsulation of Co3O4 nanoboxes into the microcapsule is achieved by using an oil-in-water emulsion. In the all-in-one microcapsule, the CNTs improve the conductivity, the microcapsule shell reduces the loss of polysulfides during cycling, and the void inside the microcapsule efficiently accommodates the volumetric change of sulfur. A Li-S battery based on the all-in-one microcapsule exhibits a high capacity of 1010 mA h g(-1) after 250 cycles and a coulombic efficiency of approximate to 99.8%. Moreover, the battery displays stable performance when cycling at temperatures of -5 degrees C and 45 degrees C, which indicates its good potential for practical applications.

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