Superior cycling life of Li–S batteries with high sulfur loading enabled by a bifunctional layered-MoO3 cathode

Ruihan Zhang, Maochun Wu, Xinzhuang Fan, Haoran Jiang, Tianshou Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)

Abstract

The shuttle effect is a critical issue that prevents practical applications of high-energy-density lithium-sulfur batteries. Here, a bifunctional positive electrode formed by growing layered molybdenum trioxide nanoflakes onto carbon paper is developed to address this issue, which exhibits not only strong binding ability to anchor polysulfides, but also efficient catalytic activity towards polysulfides redox reactions. As a result, the electrode developed in this work enables a lithium-sulfur battery to achieve an initial capacity of 1145 mAh g−1 and a retention capacity of as high as 976 mAh g−1 after 1000 cycles with a high coulombic efficiency of 99.54% at 1 C. By contrast, the battery with the pristine carbon paper electrode suffers from a severe capacity decay from the 1st cycle (655 mAh g−1) to the 1000th cycle (256 mAh g−1) with a low coulombic efficiency of 89.4%. More strikingly, even with a higher sulfur loading of 8 mg cm−2, the lithium-sulfur battery with the molybdenum trioxide nanoflakes decorated carbon paper electrode still retains a high specific capacity of 581 mAh g−1 after 1000 cycles. These great improvements reveal that molybdenum trioxide is a promising electrode material to realize the practical application of lithium-sulfur batteries.

Original languageEnglish
Article number226840
JournalJournal of Power Sources
Volume436
DOIs
Publication statusPublished - 1 Oct 2019
Externally publishedYes

Keywords

  • Electrocatalytic activity
  • In-situ Raman test
  • Layered molybdenum trioxide nanoflakes
  • Lithium-sulfur batteries
  • Shuttle effect

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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