A flexible free-standing FeF3/reduced graphene oxide film as cathode for advanced lithium-ion battery

Dafang He, Yanlin Zhang, Da Cao, Mufan Sun, Jiawei Xia, Yi Yang, Yujie Ding, Haiqun Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

High-capacity cathode materials of metal fluorides generally undergo low conductivities and sluggish kinetics derived from a multielectron-transfer conversion reaction mechanism, which severely hinder the cycling stability and rate performance towards their commercialization. Herein, a flexible free-standing FeF3/chitosan pyrolytic carbon/reduced graphene oxide (FeF3/C/RGO) film as an additive-free cathode was designed and prepared by a facile hydrothermal strategy followed by sequential freeze-drying, thermal reduction and fluorination post-treatments. The ultrafine FeF3 nanoparticles (NPs, ~30 nm) are confined within highly ordered RGO film, effectively reducing the Li+ diffusion pathway while the RGO sheets act as a matrix to restrict the complicated interlamination reaction (Fe3+⇄Fe2+⇄Fe) between adjacent interlayers with the spacing of ~30 nm. Benefiting from the free-standing structure, the FeF3/C/RGO film can achieve an admirable capacity up to 220 mAh g–1 over 200 cycles at 100 mA g–1, showing great potential for wearable and flexible electronic devices.

Original languageEnglish
Article number164702
JournalJournal of Alloys and Compounds
Volume909
DOIs
StatePublished - 15 Jul 2022
Externally publishedYes

Keywords

  • Cathode
  • Flexibility
  • Free-standing film
  • Iron fluoride
  • Lithium ion batteries

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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