Crystal structure, migration mechanism and electrochemical performance of Cr-stabilized garnet

Garnet-structured Li sub(7)La sub(3)Zr sub(2)O sub(12) is stabilized through Cr super(3+) doping at Zr super(4+) sites. The Rietveld refinement of powder XRD data is used to analyze the crystal structure and Cr site. The migration mechanisms of lithium ions are dependent on the hopping of lithium io...

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Bibliographic Details
Published in:Solid state ionics 2014-12, Vol.268, p.135-139
Main Authors: Song, Shufeng, Yan, Binggong, Zheng, Feng, Duong, Hai Minh, Lu, Li
Format: Article
Language:English
Subjects:
Chromium
Crystal structure
Doping
Garnets
Lithium ions
Migration
Pathways
Stability
Transport
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Summary:Garnet-structured Li sub(7)La sub(3)Zr sub(2)O sub(12) is stabilized through Cr super(3+) doping at Zr super(4+) sites. The Rietveld refinement of powder XRD data is used to analyze the crystal structure and Cr site. The migration mechanisms of lithium ions are dependent on the hopping of lithium ions at different sites. Three possible migration pathways are proposed, in which lithium ions transport via the tetrahedral sites. Small doping of Cr super(3+) at Zr super(4+) sites leads to high total conductivity of the 0.1 mol Cr-stabilized Li sub(7.1)La sub(3)Zr sub( 1.9)Cr sub(0.1)O sub(12) to be 5.2 x 10 super(-4) S cm super(-1) at 27 [degrees]C. The sample shows a wide electrochemical stability up to 6 V.
ISSN:0167-2738
DOI:10.1016/j.ssi.2014.10.009