In situ transformation of LDH into hollow cobalt-embedded and N-doped carbonaceous microflowers as polysulfide mediator for lithium-sulfur batteries

Shixia Chen, Xinxin Han, Junhui Luo, Jing Liao, Jun Wang, Qiang Deng, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The shuttle effect of soluble lithium polysulfides (LiPSs), accompanying with sluggish redox kinetics has severely impeded the implementation of lithium-sulfur (Li-S) batteries. Herein, a novel hollow cobalt-embedded and nitrogen-doped carbonaceous microflower (H-Co-NCM) is fabricated via in situ transformation of metanilic anions intercalated Co-Al layered double hydroxides (CoAl LDHs). The as-obtained S@H-Co-NCM electrode exhibits superior electrocatalytic performances to boost the kinetics of LiPSs conversion and Li2S nucleation. Consequently, the assembled Li-S batteries with a high sulfur loading of 82% display a remarkable initial capacity of 1374 mAh g−1 at 0.1 C, excellent rate capability (611 mAh g−1 at 2 C), and superb cycle stability (cyclic decay rate of 0.069% over 500 cycles at 0.5 C). The integrated strategy of strong chemisorption and fast conversion of LiPSs provides deeper insights to suppress the shuttle effect.

Original languageEnglish (US)
Article number123457
JournalChemical Engineering Journal
Volume385
DOIs
StatePublished - Apr 1 2020

Keywords

  • Hollow, sulfur host
  • Layered double hydroxide (LDH)
  • Lithium-sulfur batteries

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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