Surface analysis on discharged MnO2 cathode using XPS and SIMS techniques

Manickam Minakshi*, Stephen Thurgate

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

7 Citations (Scopus)

Abstract

Manganese dioxide (MnO2) appears to be an effective cathode material for a battery system. No studies on lithium insertion in aqueous media are known to the best of our knowledge. However, in one of our previous papers we reported that lithium could be intercalated into a MnO2 host compound using an aqueous LiOH electrolyte; however simple chemistry suggests that it should not. It is found that a battery with LiOH electrolyte functions quite differently from the cell that uses Li2SO4. This paper describes the surface modifications that accompany the electrochemical behavior of MnO2 during redox (discharge) processes in the lithium hydroxide and sulfate media. XPS and SIMS techniques were used to study the resultant surface of the MnO2 cathode and the spectra reveal that the formation of an insoluble layer of Li2CO3 precedes the process of reduction. SEM was used to study the microstructure of the MnO 2 cathode.

Original languageEnglish
Pages (from-to)56-60
Number of pages5
JournalSurface and Interface Analysis
Volume41
Issue number1
DOIs
Publication statusPublished - Jan 2009

Keywords

  • Aqueous battery
  • LiCO
  • MnO
  • SIMS
  • XPS

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