Metal-Organic Framework Derived Iron Sulfide-Carbon Core-Shell Nanorods as a Conversion-Type Battery Material

Wei Huang, Shuo Li, Xianyi Cao, Chengyi Hou, Zhen Zhang, Jinkui Feng, Lijie Ci, Pengchao Si, Qijin Chi

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We report the design and nanoengineering of carbon-film-coated iron sulfide nanorods (C@Fe7S8) as an advanced conversion-type lithium-ion storage material. The structural advantages of the iron-based metal-organic framework (MIL-88-Fe) as both a sacrificed template and a precursor are explored to prepare carbon-encapsulated ploy iron sulfide through solid-state chemical sulfurizing. The resulting core-shell nanorods consisting of approximately 13% carbon and 87% Fe7S8 have a hierarchically porous structure and a very high specific surface area of 277 m2g-1. When tested for use in fabrication of a redox conversion-type lithium-ion battery, this composite material has demonstrated high lithium-ion storage capacity at 1148 mA h g-1 under the current rate of 500 mA g-1 for 170 cycles and an impressive rate-retention capability at 657 mA h g-1 with a current density of 2000 mA g-1. On the basis of systematic structural analysis and microscopic mapping, we discuss the charge-discharge mechanisms and the crucial factors associated with the stability and structural changes upon charge-discharge cycling.
Original languageEnglish
JournalA C S Sustainable Chemistry & Engineering
Volume5
Issue number6
Pages (from-to)5039-5048
ISSN2168-0485
DOIs
Publication statusPublished - 2017

Keywords

  • Carbon-coated nanomaterial
  • Iron sulfide
  • Lithium-ion storage
  • Metal-organic framework
  • One-pot templated synthesis

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