Inter-grain Li+ conduction in Sc and Y doped LATP compounds

Low value of grain boundary conductivity in Li-NASICON materials is an important limitation that needs to be overcome. Inter-grain conduction of Li + ions in Li1·3Al0.3-xScxTi1.7(PO4)3 (LASTP) and Li1·3Al0.3-xYxTi1.7(PO4)3 (LAYTP) (where x = 0.01 and 0.07) samples is investigated. The samples, prepa...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2022-02, Vol.627, p.413599, Article 413599
Main Authors: Kothari, Dharmesh H., Kanchan, D.K.
Format: Article
Language:English
Subjects:
Conductivity
Dopant
Electrochemical impedance spectroscopy
Frequency ranges
Grain boundaries
Grain size
LATP
Li grain boundary conductivity
Scanning electron microscopy
Solid state physics
Space charge
Yttrium
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Summary:Low value of grain boundary conductivity in Li-NASICON materials is an important limitation that needs to be overcome. Inter-grain conduction of Li + ions in Li1·3Al0.3-xScxTi1.7(PO4)3 (LASTP) and Li1·3Al0.3-xYxTi1.7(PO4)3 (LAYTP) (where x = 0.01 and 0.07) samples is investigated. The samples, prepared by solid state reaction method, were characterised by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques. Electrochemical Impedance Spectroscopy (EIS) was performed in the frequency range of 20 MHz to 1 Hz, and temperature range of 20 °C–100 °C. The grain boundary impedance and capacitance was found to vary with an external dc bias voltage. Higher grain boundary conductivity was found for sample containing higher yttrium concentration. Effect of space charge on grain boundary conductivity is evaluated in light of two competing models. •Grain boundary conductivity in scandium and yttrium doped Li-Al-Ti-P (LATP) material is studied.•LiTi2(PO4)3 (LTP) was identified as the primary Li+ ion conducting phase. It belongs to R-3c space group. Small amounts of secondary phases were also identified.•Accumulated ions rather than depleted charges from grain boundary core form space charge at grain boundary.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2021.413599