Abstract
Solid-state Li batteries are promising energy-storage devices owing to their high-energy densities with improved safety. However, the large interfacial resistance at the interface of solid-electrolytes and electrodes hinders the development of the solid-state Li batteries. Our group has been investigating surfaces and interfaces of transition-metal oxides, such as SrTiO3, LaAlO3/SrTiO3, SrVO3, La0.7Ca0.3MnO3, and LiTi2O4, using epitaxial thin-film deposition technology and scanning tunneling microscopy [1-7]. Accordingly, we introduced the above knowledge of the atomic-scale investigation of oxide surfaces into battery research. We succeeded in fabricating the interface resistance below 5 Ωcm2(Li3PO4/LiCoO2interface [8,9],Li3PO4/LiNi0.5Mn1.5O4interface [10]); the value is smaller than that of liquid-electrolyte-based Li-ion batteries. These studies strongly encourage solid-state Li battery research, by demonstrating a very low interface resistance leading to fast charging and discharging.
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