Skip to main content
eScholarship
Open Access Publications from the University of California

Durable carbon-coated Li2(S) core-shell spheres for high performance lithium/sulfur cells.

  • Author(s): Nan, Caiyun
  • Lin, Zhan
  • Liao, Honggang
  • Song, Min-Kyu
  • Li, Yadong
  • Cairns, Elton J
  • 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(-1) Li2S (1394 mAh g(-1) S) 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.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View