Redox-mediated polymer catalyst for lithium-air batteries with high round-trip efficiency

Min Cheol Kim, Jung Hyun Song, Young Woo Lee, Jung Inn Sohn

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Lithium-air batteries (LABs) continue to receive attention as a promising power source because they possess a high theoretical energy density of 3436 Wh L−1. However, the remaining Li2O2 resulting from the irreversible decomposition of Li2O2 during the charge process is one of the key challenges so as to address the deterioration of the cycling performance of LABs. In this study, we propose and report a redox-mediated polymer catalyst (RPC) as a cathode catalyst being composed of LiI and poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) with multi-wall carbon nanotubes (MWCNTs) as the cathode material. In the RPC, iodine molecules are chemically combined with the PVDF-HFP chain. The as-prepared RPC exhibits increased cycling performance by 194% and decreased overpotential by 21.1% at 0.1 mA cm−2 compared to the sample without LiI molecules. Furthermore, these results suggest that the RPC consisting of a polymer chain and redox mediators will be extensively utilized as highly efficient catalysts of LABs.

Original languageEnglish
Article number1479
Pages (from-to)1-9
Number of pages9
JournalCatalysts
Volume10
Issue number12
DOIs
StatePublished - Dec 2020

Keywords

  • LiI
  • Lithium-air batteries
  • PVDF-HFP
  • Redox-mediated polymer catalyst

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