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Title: Synthesis and characterization of substituted garnet and perovskite-based lithium-ion conducting solid electrolytes

In this study, titanium, tantalum-substituted Li 7La 3Z r2-xA xO 12 (LLZO, A = Ta, Ti) garnets, and chromium-substituted La (2/3)-xLi 3xTi 1-yCr yO 3 (LLTO) perovskites were prepared by a conventional solid-state reaction and the Pechini processes. The desired crystal phases were obtained by varying the calcination temperature and time, as well as the substitution concentration. All samples indicated decomposition of the precursors when heated above 750 °C and formation of the desired phase after heat treatment at higher temperatures. Neutron diffraction data shows the formation of a predominant cubic phase in the case of Ta-LLZO, and monoclinic phase with minor impurity phases for Cr-LLTO. Ionic conductivity for Ti-LLZO (Li 7La 3Zr 1.4Ti 0.6O 12), Ta-LLZO (Li 6.03La 3Zr 1.533Ta 0.46O 12), and Cr-LLTO (La (2/3)-xLi 3xTi 0.9Cr 0.1O 3) at room temperature were found to be 5.21 × 10 –6, 1.01 ×10 –6, and 1.2 × 10 –4 S cm –1, respectively. The activation energies of the compounds were determined from the Arrhenius plot and were 0.44 eV (Ti 0.6-LLZO), 0.54 eV (Ta 0.5-LLZO), and 0.20 eV (Cr 0.1-LLTO).
 [1] ;  [2] ;  [2] ; ;  [2] ;  [2] ;  [3] ;  [4]
  1. National Energy Technology Lab. (NETL), Albany, OR (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Hydro-Quebec, Montreal, QC (Canada)
  4. National Energy Technology Lab. (NETL), Albany, OR (United States); West Virginia Univ., Morgantown, WV (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
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Additional Journal Information:
Journal Volume: 22; Journal Issue: 3; Journal ID: ISSN 0947-7047
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; solid electrolytes; garnet; Perovskite; lithium-ion conduction; solid-state lithium-ion battery
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