A sandwich-type sulfur cathode based on multifunctional ceria hollow spheres for high-performance lithium-sulfur batteries

Jianwei Wang, Bo Zhou, Hongyang Zhao, Miaomiao Wu, Yaodong Yang, Xiaolei Sun, Donghai Wang, Yaping Du

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Despite prominent research efforts towards developing cathode materials for lithium-sulfur batteries, relatively little emphasis has been placed on constructing functional cathode architectures. Herein, ceria (CeO2) hollow spheres are prepared to fabricate the inside and outside structures of cathodes. A sandwich-type sulfur cathode, namely, a h-CeO2/sulfur-x-CNT/h-CeO2 cathode, is designed and fabricated by a simple layer-by-layer process. Due to its unique structural and compositional features, the h-CeO2/sulfur-0.8-CNT/h-CeO2 cathode delivers high specific capacities of 876, 761, and 644 mA h g-1 at 1C, 2C and 5C rates, and the capacity retentions are 85.7%, 87.8%, and 92.4%, respectively. During 100 test cycles, the material displays high coulombic efficiencies (above 99%) after the first cycle. More importantly, the cathode with a sulfur loading of 1.8 mg cm-2 also exhibits a stable cycling life up to 500 cycles at 1C with a capacity decay as low as 0.073% per cycle.

Original languageEnglish (US)
Pages (from-to)1317-1322
Number of pages6
JournalMaterials Chemistry Frontiers
Volume3
Issue number7
DOIs
StatePublished - Jul 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Materials Chemistry

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