Examination of graphene nanoplatelets as cathode materials for lithium-oxygen batteries by differential electrochemical mass spectrometry

Jung Eun Park, Gwang Hee Lee, Hyun Woo Shim, Dong Wook Kim, Yongku Kang, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this study, in situ differential electrochemical mass spectrometry was employed to investigate the electrochemical rechargeability of two types of graphene nanoplatelets (GNPs) as electrode materials for lithium-oxygen batteries by evaluating oxygen efficiency as well as coulombic efficiency. GNPs having hydrophobic surfaces exhibit much higher specific capacity than those having hydrophilic surfaces. When lithium nitrate-N,N-dimethylacetamide (LiNO3-DMAc) is used as the electrolyte, the lithium-oxygen battery exhibits a long cycle life, and unwanted side reactions are effectively suppressed. The LiNO3-DMAc electrolyte is more stable than the lithium bis(trifluoromethane)sulfonamide-tetraethylene glycol dimethyl ether electrolyte, as evidenced by high O2 evolution and low CO2 evolution.

Original languageEnglish
Pages (from-to)39-42
Number of pages4
JournalElectrochemistry Communications
Volume57
DOIs
Publication statusPublished - 2015 Aug 1

Keywords

  • Differential electrochemical mass spectrometry
  • Electrolytes
  • Graphene nanoplatelets
  • Li-oxygen batteries

ASJC Scopus subject areas

  • Electrochemistry

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