Abstract
All-solid-state batteries (ASSBs) using inorganic solid electrolytes are one of the candidates of next-generation batteries. However, ASSBs suffer from various issues, most of which do not matter in conventional lithium-ion batteries with liquid electrolytes. In this chapter, mechanical stress in solid electrolytes are focused. First, we reveal that garnet-type solid electrolytes, Li6.5La3Zr1.5Ta0.5O12 (LLZT), prepared by the spark plasma sintering (SPS) method, exhibit a residual tensile stress of more than 100 MPa in the direction of uni-axial pressure during the SPS process, which was revealed by XRD (side-inclination method). Then, the influence of the stress on ionic conduction is studied. Detailed analyses reveal that the stress mainly influences grain boundary resistance with little change in the bulk resistance of LLZT. The results suggest the importance of mechanically strong grain boundaries (including interfaces) for practical ASSBs.
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Acknowledgments
Part of this work was financially supported by the research project “Advanced Low Carbon Technology Research and Development Program for Specially Promoted Research for Innovative Next Generation Batteries” of the Japan Science and Technology Agency (JST-ALCA SPRING), which is gratefully acknowledged. The author is also thankful to Ms. T. Ito (Nagasaki University) for her synthesis and preparation of specimens, and to Dr. R. Bekarevich (National Institute for Materials Science) and Dr. K. Mitsuishi (National Institute for Materials Science) for advanced skills and helpful discussions on the STEM observation and EDS-ED analyses.
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Yamada, H. (2019). Influence of Strain on Garnet-Type Electrolytes. In: Murugan, R., Weppner, W. (eds) Solid Electrolytes for Advanced Applications. Springer, Cham. https://doi.org/10.1007/978-3-030-31581-8_4
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DOI: https://doi.org/10.1007/978-3-030-31581-8_4
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