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ytisned1)%(l evitaeRLi5Co2(PO4)3(x=2)Li3PO4Co3(PO4)2LiCoPO4Co0.5Ti2(PO4)3(y=0.5)Li2Ti(PO4)2LiTi2(PO4)3Ti3(PO4)430 °C •Potentially the Most Reliable and Maintenance-Free•Potential for Extreme Environment ApplicationsOxide-based All-Solid-State BatteriesSulfide-based All-Solid-State BatteriesLithium-ion Batteries@ 1.5 ｍA g−1and 25 °C @ 350 µA cm−2and 25 °C Bi-substituted LLZTLLZTSpace: High durability, wide operating temperature rangeCo content (mol/mol)MiniaturizationDurabilityIslands & Oceans: Maintenance-freeSafetyLightweight DesignOperating Temperature RangePolar Regions: High-temperature and low-temperature operation• Oxide-based All-Solid-State Batteries800 °CP1-2562Solid-State Battery Group, GREEN Kazunori TakadaE-mail：： takada.kazunori@nims.go.jpLow-temperatureHigh resistance due to high porosity and weak linkage between the materials Predicted reaction productby thermodynamic calculation LiPO3+LiTiOPO4Mechanism of enhanced sintering by sintering additives Composite with sinterable electrolyte Solid-state batteries developed in AIST (left, middle) and Kyushu Univ. (right)Reduction of particle size A dilemma in sintering process for connecting battery materials Establishing process science for battery assemblyALCA-SPRING project (JST, 2013–2022) K-program (JST, 2025–2032) Solid-state batteries operatable at room temperature by developing solid-electrolytes exhibiting low sintering-temperature Development of oxide-based solid-state batteries applicable to isolated or extreme environmentsHigh-temperatureHigh interface resistance due to the formation of impurity phaseVerification of the predicted reaction productsby XRD and XANESA hurdle to oxide-based solid-state batteries Materealize project (MEXT, 2019–2026)  Oxide-based solid-state batteries have become operatable at room temperature in bulk-type configuration.  Established process science will provide us guidelines to enhance the battery performance.  Development of solid-state batteries with practical configuration for use in isolated or extreme environments. Bi substitution to generate molten phaseR&D projects on oxide-based solid-state batteries ConclusionKey Words: solid-state battery, oxide solid electrolyteKey Words: solid-state battery, oxide solid electrolyteFuture PlanLithium-ion batteries that have been used mainly in portable equipment are now expected to power electric vehicles and store renewable energy in smart grids for realizing a low-carbon society. High reliability including long-term durability is required for the batteries in such application Solid-state batteries have high durability owing to the ion selectivity and that with sulfide electrolytes are in the final stage to vehicle application. Howver, sulfide electrolyte are hygroscopic materials and generate harmful H2S in ambient air. Therefore, solid-state batteries with stable oxide electrolytes are required for wide-range application. IntroductionTheme underDiscussionDiscussionDevelopment of Oxide-Based Solid-State Development of Oxide-Based Solid-State BatteriesBatteries