Sol–gel synthesis and lithium ion conduction properties of garnet-type Li{sub 6}BaLa{sub 2}Ta{sub 2}O{sub 12}

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2012.04.032· OSTI ID:22215172

Ramanujachary, K. V. ^[1]; Notten, P. H.L.; Hintzen, H. T. ^[2]

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1. Department of Chemistry and Biochemistry, Rowan University, Glassboro, New Jersey, NJ 08028 (United States)
2. Energy Materials and Devices, Department of Chemistry and Chemical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven (Netherlands)

Graphical abstract: Li{sub 6}BaLa{sub 2}Ta{sub 2}O{sub 12}, prepared by sol–gel synthesis method, shows a total Li-ion conductivity of 1.69 × 10{sup −5} S/cm at 298 K and an activation energy is 0.40 eV. Highlights: ► Garnet-type fast ion conductor LLBTO was synthesized by modified sol–gel Pechini method. ► The synthesis temperature is significantly lower (200 K) than conventional solid state synthesis methods. ► The ionic conductivity of sol–gel synthesized LLBTO is 1.69 × 10{sup −5} S/cm. -- Abstract: High lithium ion conductive garnet-type barium lanthanum lithium tantalate, Li{sub 6}BaLa{sub 2}Ta{sub 2}O{sub 12} (LLBTO), was prepared by a modified sol–gel Pechini method from the appropriate mixtures of lithium carbonate, lanthanum oxide, barium carbonate and tantalum ethoxide. The thermal decomposition of the precursor powder was investigated by TG/DTA analysis. The LLBTO precursor powders were annealed at various temperatures between 923 and 1123 K for 6 h in air. The transformation process from precursor powder to crystalline garnet-like phase was analyzed by X-ray powder diffraction (XRPD). The morphology of the powders annealed at various temperatures was investigated by scanning electron microscopy (SEM). The resultant pelletized Li{sub 6}BaLa{sub 2}Ta{sub 2}O{sub 12}, prepared by sol–gel synthesis method, shows a total Li-ion conductivity of 1.69 × 10{sup −5} S/cm at 298 K and an activation energy is 0.40 eV. The ionic conductivities reported in this study are slightly higher than those reported for LLBTO sample synthesized by conventional solid state synthesis route.

• OSTI ID: 22215172
• Journal Information: Materials Research Bulletin, Vol. 47, Issue 8; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ACTIVATION ENERGY
DIFFERENTIAL THERMAL ANALYSIS
GARNETS
INORGANIC COMPOUNDS
IONIC CONDUCTIVITY
LITHIUM CARBONATES
MIXTURES
POWDERS
PRECURSOR
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
SOLIDS
SPECTROSCOPY
SYNTHESIS
X-RAY DIFFRACTION