Preparation of Li1.5Al0.5Ti1.5(PO4)3 solid electrolyte via coprecipitation using various PO4 sources

Li1.5Al0.5Ti1.5(PO4)3 (LATP) solid electrolyte is prepared via coprecipitation using H3PO4, NH4H2PO4 or (NH4)2HPO4 as a PO4 source. Field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD) measurements clearly show the PO4 source influences crystal structure and morphology of...

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Bibliographic Details
Published in:Materials technology (New York, N.Y.) N.Y.), 2014-11, Vol.29 (A2), p.A93-A97
Main Authors: Kotobuki, M, Kobayashi, B, Koishi, M, Mizushima, T, Kakuta, N
Format: Article
Language:English
Subjects:
Coprecipitation
Field emission
Formations
Grain boundaries
Impurities
Morphology
Scanning electron microscopy
Solid electrolytes
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Summary:Li1.5Al0.5Ti1.5(PO4)3 (LATP) solid electrolyte is prepared via coprecipitation using H3PO4, NH4H2PO4 or (NH4)2HPO4 as a PO4 source. Field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD) measurements clearly show the PO4 source influences crystal structure and morphology of LATP after sintering at 1000 degree C. AlPO4 impurity formation is observed only in the LATP prepared using H3PO4. In terms of the morphology difference, the LATP dense pellet prepared from H3PO4 and (NH4)2HPO4 is composed of many small grains. Contrary, the grain boundary is hardly observed in the LATP prepared from NH4H2PO4. The LATP prepared using NH4H2PO4 reveals the highest Li ion conductivity due to no impurity formation and less grain boundaries which lead to lower resistance at the grain boundaries. It is concluded that usage of suitable PO4 source is a vital point of the LATP preparation via coprecipitation.
ISSN:1066-7857
1753-5557
DOI:10.1179/1753555714Y.0000000181