Propelling polysulfides transformation for high-rate and long-life lithium–sulfur batteries

Cheng Zheng, Shuzhang Niu, Wei Lv, Guangmin Zhou, Jia Li, Shaoxun Fan, Yaqian Deng, Zhengze Pan, Baohua Li, Feiyu Kang, Quan Hong Yang

Research output: Contribution to journalArticlepeer-review

240 Citations (Scopus)

Abstract

A three-dimensional (3D) hierarchical porous graphene macrostructure coupled with uniformly distributed α-Fe2O3 nano-particles (denoted Fe-PGM) was designed as a sulfur host in a lithium-sulfur battery, and was prepared by a hydrothermal method. In this hybrid structure, the α-Fe2O3 nano-particles are proved to not only strongly interact with the polysulfides, but more importantly, chemically promote their transformation to insoluble species during the charge/discharge process, working as chemical barriers for the shuttling of the lithium polysulfides (LiPSs). Therefore, together with 3D hierarchical porous structure facilitating fast electron/ion transfer, Fe-PGM as a sulfur host in a cathode contributes to a high rate performance (565 mAh g−1 at a high rate of 5 C relative to 1571 mAh g−1 at 0.3 C) as well as long cyclic stability (an ultralow capacity fading rate of 0.049% per cycle over 1000 cycles at the high current rate of 5 C).

Original languageEnglish
Pages (from-to)306-312
Number of pages7
JournalNano Energy
Volume33
DOIs
Publication statusPublished - 2017 Mar 1
Externally publishedYes

Keywords

  • 3D α-FeO/graphene hybrid
  • Lithium-sulfur batteries
  • Polysulfides transformation
  • Redox reaction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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