Preparation and electrochemical properties of Zr-site substituted Li sub(7)La sub(3)(Zr sub(2-x)M sub(x))O sub(12) (M = Ta, Nb) solid electrolytes

Li sub(7)La sub(3)Zr sub(2)O sub(12) (LLZ) solid electrolytes with Zr site partially substituted by Ta and Nb elements were prepared via the conventional solid-state reaction. All the compositions could lead to the cubic garnet-type structure after sintering at 1150 [degrees]C. The use of gamma -Al...

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Bibliographic Details
Published in:Journal of power sources 2014-01, Vol.261, p.206-211
Main Authors: Huang, Mian, Shoji, Mao, Shen, Yang, Nan, Ce-Wen, Munakata, Hirokazu, Kanamura, Kiyoshi
Format: Article
Language:English
Subjects:
Aluminum
Doping
Ionic conductivity
Niobium
Sintering
Solid electrolytes
Tantalum
Zirconium
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Summary:Li sub(7)La sub(3)Zr sub(2)O sub(12) (LLZ) solid electrolytes with Zr site partially substituted by Ta and Nb elements were prepared via the conventional solid-state reaction. All the compositions could lead to the cubic garnet-type structure after sintering at 1150 [degrees]C. The use of gamma -Al sub(2)O sub(3) as a sintering aid in the preparation of doped LLZ was studied. It was shown that Al could help to improve the micro-structure for Nb doping, but not necessary for Ta doping. The Ta and Nb doping enhanced the ionic conductivity at 25 [degrees]C to 4.09 x 10 super(-4) S cm super(-1) and 4.50 x 10 super(-4) S cm super(-1), respectively. A conductivity as high as 1.23 x 10 super(-3) S cm super(-1) was obtained when measured at 50 [degrees]C in air for the Nb-doped LLZ. All-solid-state batteries with LLZTa and LLZNb solid electrolytes were assembled and tested. The cyclic voltammetry (CV) measurement indicated the successful working of the batteries.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2014.03.070