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Durable carbon-coated Li2S core-shell spheres for high performance lithium/sulfur cells

  • Author(s): Nan, C
  • Lin, Z
  • Liao, H
  • Song, MK
  • Li, Y
  • Cairns, EJ
  • et al.

Published Web Location

https://doi.org/10.1021/ja412943h
Abstract

Lithium sulfide (Li2S) is an attractive cathode material with a high theoretical specific capacity (1166 mAh g-1). However, the poor cycle life and rate capability have remained significant challenges, preventing its practical application. Here, Li2S spheres with size control have been synthesized for the first time, and a CVD method for converting them into stable carbon-coated Li2S core-shell (Li2S@C) particles has been successfully employed. These Li2S@C particles with protective and conductive carbon shells show promising specific capacities and cycling performance with a high initial discharge capacity of 972 mAh g-1Li2S (1394 mAh g-1S) at the 0.2C rate. Even with no added carbon, a very high Li2S content (88 wt % Li2S) electrode composed of 98 wt % 1 μm Li2S@C spheres and 2 wt % binder shows rather stable cycling performance, and little morphology change after 400 cycles at the 0.5C rate. © 2014 American Chemical Society.

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