High ionic conductivity in a LiFeO2-LiAlO2 composite under H2/air fuel cell conditions

Rong Lan, Shanwen Tao

Research output: Contribution to journalArticle

16 Citations (Scopus)
79 Downloads (Pure)

Abstract

New ionic conducting materials for electrolytes for electrochemical devices have been attracting the interest of researchers in energy materials. Here, for the first time, we report a conductive composite with high ionic conductivity derived from an electronic conductor α-LiFeO2 and an insulator γ-LiAlO2. High conductivity was observed in the α-LiFeO2-γ-LiAlO2 composite when prepared by a solid state reaction method. However, the conductivity enhancement in α-LiFeO2-γ-LiAlO2 composite was not observed when the two oxides were mechanically mixed. The α-LiFeO2-γ-LiAlO2 composite also exhibits O2- or/and H+ ionic conduction which was confirmed through H2/air fuel cell measurements. An exceptionally high conductivity of 0.50 S cm-1 at 650°C was observed under H2/air fuel cell conditions. This provides a new approach to discover novel ionic conductors from composite materials derived from electronic conductors.

Original languageEnglish
Pages (from-to)1350-1358
Number of pages9
JournalChemistry - A European Journal
Volume21
Issue number3
Early online date13 Nov 2014
DOIs
Publication statusPublished - 12 Jan 2015

Keywords

  • composites
  • electrochemistry
  • electronic conductors
  • ionic conductor
  • oxygen ion conductor

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