Effect of y substitution for Nb in Li5La3Nb 2O12 on Li ion conductivity of garnet-type solid electrolytes

Sumaletha Narayanan, Venkataraman Thangadurai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report the effect of Y substitution for Nb on Li ion conductivity in the well-known garnet-type Li5La3Nb2O 12. Garnet-type Li5La3Nb2-xY xO12-δ (0 ≤ x ≤ 1) was prepared by ceramic method using the high purity metal oxides and salts. Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), 7Li nuclear magnetic resonance (Li NMR) and AC impedance spectroscopy were employed for characterization. PXRD showed formation of single-phase cubic garnet-like structure for x up to 0.25 and above x = 0.25 showed impurity in addition to the garnet-type phases. The cubic lattice constant increases with increasing Y content up to x = 0.25 in Li5La3Nb2- xYxO12-δ and is consistent with expected ionic radius trend. 7Li MAS NMR showed single peak, which could be attributed to fast migration of ions between various sites in the garnet structure, close to chemical shift 0 ppm with respect to solid LiCl and which confirmed that Li ions are distributed at an average octahedral coordination in Li5La3Nb2-xYxO 12-δ. Y-doped compounds showed comparable electrical conductivity to that of the parent compound Li5La3Nb 2O12. The x = 0.1 member of Li5La 3Nb2-xYxO12- δ showed total (bulk + grain-boundary) ionic conductivity of 1.44 × 10-5 Scm-1 at 23 °C in air.

Original languageEnglish
Pages (from-to)8085-8090
Number of pages6
JournalJournal of Power Sources
Volume196
Issue number19
DOIs
Publication statusPublished - 1 Oct 2011

Keywords

  • Li NMR
  • AC impedance spectroscopy
  • Garnets
  • Li ion electrolytes
  • LiLa NbYO
  • Metal oxides

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