Autoxidation in amide-based electrolyte and its suppression for enhanced oxygen efficiency and cycle performance in non-aqueous lithium oxygen battery

Dong Wook Kim, Dong Hun Lee, Su Mi Ahn, Do Youb Kim, Jungdon Suk, Dong Hoon Choi, Yongku Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In spite of several desirable properties such as high stability against superoxide anion and low vapor pressure, N-methyl-2-pyrrolidone (NMP) electrolyte is reported not suitable for use in lithium-oxygen (Li-O2) batteries because of severe degradation upon cycling and low oxygen efficiency. In this work, we find that NMP electrolyte is reactive with O2 gas in the presence of lithium metal and such O2-consuming reaction (i.e., autoxidation) is a possible cause for the poor performance in Li-O2 batteries with NMP electrolyte. The autoxidation of NMP is verified by direct measurement of the depletion of O2 gas in the hermetically sealed symmetric Li/Li cells via in-situ gas pressure analysis. In-situ differential electrochemical mass spectroscopy (DEMS) experiment reveals that the autoxidation resulted in significant O2 consumption upon discharge, very low O2 efficiency upon charge, and eventually fast capacity fading. Lithium nitrate (LiNO3), which provides a protective layer on the surface of lithium metal, is employed to suppress the autoxidation, leading to significantly enhanced oxygen efficiency and cycle life.

Original languageEnglish
Pages (from-to)186-192
Number of pages7
JournalJournal of Power Sources
Volume347
DOIs
Publication statusPublished - 2017 Apr 15

Keywords

  • Autoxidation
  • In-situ gas pressure analysis
  • Lithium nitrate
  • Lithium-oxygen battery
  • N-methyl-2-pyrrolidone

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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