Abstract
Li1.5Al0.5Ti1.5(PO4)3 (LATP) powders were prepared from different NO x -free precursors using an aqueous-based solution-assisted solid-state reaction (SA-SSR). The sintering behavior, phase formation, microstructure and ionic conductivity of the powders were explored as a function of sintering temperature. The powders showed a relatively narrow temperature windows in which shrinkage occurred. Relative densities of 95% were reached upon heating between 900 and 960 °C. Depending on the morphological features of the primary particles, either homogeneous and intact microstructures with fine grains of about <2 µm in size or a broad grain size distribution, micro-cracks and grain cleavages were obtained, indicating the instability of the microstructure. Consequently, the ceramics with a homogeneous microstructure possessed a maximum total ionic conductivity of 0.67 mS cm−1, whereas other ceramics reached only 0.58 mS cm−1 and 0.21 mS cm−1.
Dedicated to Paul Heitjans on the occasion of his 75th birthday.
Funding source: German Federal Ministry of Education and Research (BMBF)
Award Identifier / Grant number: 03XP0109E
Acknowledgements
We thank Dr. D. Grüner (FZJ, IEK-2) for the SEM investigations, M. Andreas and V. Bader for technical assistance, and A. Hilgers for PSD and M.-T. Gerhards for DTA/TG and dilatometry measurements. We also thank our colleagues at the Central Institute of Engineering, Electronics and Analytics (ZEA-3) for the ICP-OES analysis.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The results of this work are part of the project “BCT – Battery Cell Technology” funded by the German Federal Ministry of Education and Research (BMBF) under support code 03XP0109E. The authors take responsibility for the content of this publication.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/zpch-2021-3090).
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