Enhanced Lithium- and Sodium-Ion Storage in an Interconnected Carbon Network Comprising Electronegative Fluorine

Seok Min Hong, Vinodkumar Etacheri, Chulgi Nathan Hong, Seung Wan Choi, Ki Bong Lee, Vilas G. Pol

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Fluorocarbon (CxFy) anode materials were developed for lithium- and sodium-ion batteries through a facile one-step carbonization of a single precursor, polyvinylidene fluoride (PVDF). Interconnected carbon network structures were produced with doped fluorine in high-temperature carbonization at 500-800 °C. The fluorocarbon anodes derived from the PVDF precursor showed higher reversible discharge capacities of 735 mAh g-1 and 269 mAh g-1 in lithium- and sodium-ion batteries, respectively, compared to the commercial graphitic carbon. After 100 charge/discharge cycles, the fluorocarbon showed retentions of 91.3% and 97.5% in lithium (at 1C) and sodium (at 200 mA g-1) intercalation systems, respectively. The effects of carbonization temperature on the electrochemical properties of alkali metal ion storage were thoroughly investigated and documented. The specific capacities in lithium- and sodium-ion batteries were dependent on the fluorine content, indicating that the highly electronegative fluorine facilitates the insertion/extraction of lithium and sodium ions in rechargeable batteries.

Original languageEnglish
Pages (from-to)18790-18798
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number22
DOIs
Publication statusPublished - 2017 Jun 7

Keywords

  • fluorocarbon
  • interconnected carbon network
  • lithium-ion batteries
  • polyvinylidene fluoride
  • sodium-ion batteries

ASJC Scopus subject areas

  • Materials Science(all)

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