Transport properties and lithium insertion study in the p-type semi-conductors AgCuO2 and AgCu0.5Mn0.5O2

F. Sauvage, D. Muñoz-Rojas, K. R. Poeppelmeier, N. Casañ-Pastor

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22 Citations (Scopus)

Abstract

The transport properties and lithium insertion mechanism into the first mixed valence silver-copper oxide AgCuO2 and the B-site mixed magnetic delafossite AgCu0.5Mn0.5O2 were investigated by means of four probes DC measurements combined with thermopower measurements and in situ XRD investigations. AgCuO2 and AgCu0.5Mn0.5O2 display p-type conductivity with Seebeck coefficient of Q=+2.46 and +78.83 μV/K and conductivity values of σ=3.2×10-1 and 1.8×10-4 S/cm, respectively. The high conductivity together with the low Seebeck coefficient of AgCuO2 is explained as a result of the mixed valence state between Ag and Cu sites. The electrochemically assisted lithium insertion into AgCuO2 shows a solid solution domain between x=0 and 0.8Li+ followed by a plateau nearby 1.7 V (vs. Li+/Li) entailing the reduction of silver to silver metal accordingly to a displacement reaction. During the solid solution, a rapid structure amorphization was observed. The delafossite AgCu0.5Mn0.5O2 also exhibits Li+/Ag+ displacement reaction in a comparable potential range than AgCuO2; however, with a prior narrow solid solution domain and a less rapid amorphization process. AgCuO2 and AgCu0.5Mn0.5O2 provide a discharge gravimetric capacity of 265 and 230 mA h/g above 1.5 V (vs. Li+/Li), respectively, with no evidence of a new defined phases.

Original languageEnglish
Pages (from-to)374-380
Number of pages7
JournalJournal of Solid State Chemistry
Volume182
Issue number2
DOIs
Publication statusPublished - Feb 2009

Keywords

  • Delafossite
  • In situ XRD
  • Lithium batteries
  • Silver-copper mixed oxides
  • p-Type semi-conductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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