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

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

Research output: Contribution to journalArticle

19 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

Fingerprint

Lithium
Silver
Transport properties
insertion
Solid solutions
solid solutions
Seebeck coefficient
conductors
lithium
Amorphization
transport properties
Seebeck effect
conductivity
silver
valence
silver oxides
Copper oxides
Thermoelectric power
copper oxides
plateaus

Keywords

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

ASJC Scopus subject areas

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

Cite this

Transport properties and lithium insertion study in the p-type semi-conductors AgCuO2 and AgCu0.5Mn0.5O2. / Sauvage, F.; Muñoz-Rojas, D.; Poeppelmeier, Kenneth R; Casañ-Pastor, N.

In: Journal of Solid State Chemistry, Vol. 182, No. 2, 02.2009, p. 374-380.

Research output: Contribution to journalArticle

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