Journal Article

FZJ-2021-01180

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Insights into the reactive sintering and separated specific grain/grain boundary conductivities of Li1.3Al0.3Ti1.7(PO4)3

Xu, Q.FZJ*RWTH* ; Tsai, C.-L.FZJ* ; Song, D.FZJ* ; Basak, S.FZJ* ; Kungl, H.FZJ* ; Tempel, H.FZJ* ; Hausen, F.FZJ*RWTH* ; Yu, S. (Corresponding author)FZJ* ; Eichel, R.-A.FZJ*RWTH*

2021
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27601  doi:10.1016/j.jpowsour.2021.229631

Abstract: Li1.3Al0.3Ti1.7(PO4)3 (LATP) is a promising candidate as solid electrolyte and Li+ conductive component in the composite electrodes of all-solid-state Li-ion batteries. For both applications, reducing the sintering temperature of LATP while preserving its electrochemical properties is highly desired. This work is dedicated to reducing the sintering temperature of LATP from conventionally around 1000 °C to a low temperature of 775 °C with adding an extra 10 wt % of Li2CO3 to the precursors by a reactive sintering process. Comparative investigations with the stoichiometric LATP prepared by the same sintering method indicate that the combination effect of reactive sintering and Li2CO3-excess promotes the liquid phase sintering within LATP yielding a high relative density of 95.3%, whereas the stoichiometric LATP can only achieve a comparable relative density at 875 °C. Furthermore, the reactive sintering assisted Li2CO3-excess LATP exhibits a significantly higher ionic conductivity of 0.65 mS cm−1 at 25 °C and lower total activation energy of 0.334 eV compared with that of the stoichiometric LATP. Correlative studies on the microstructure and the separated specific grain/grain boundary conductivities for the two samples reveal that the improvement of Li+ conductivity for Li-excess LATP is attributed to its smaller total grain boundary thickness.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)
2. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 122 - Elektrochemische Energiespeicherung (POF4-122) (POF4-122)
2. 535 - Materials Information Discovery (POF4-535) (POF4-535)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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