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Nanoionics Design Engineering Lab
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A lab that builds new storage batteries with nonflammable solid electrolytes.
AboutAbout the lab
From liquid-electrolyte batteries to beyond all-solid-state batteries.
The Iriyama-Yajima Lab researches new storage batteries, especially all-solid-state batteries.
Replacing the flammable liquid electrolyte of lithium-ion batteries with a nonflammable ceramic solid electrolyte greatly improves battery safety and also extends battery life.
The lab focuses on ion movement at the interface between the electrode and the solid electrolyte, which is a major challenge, and works on the design of "nanoionics" with the solid electrolyte at its core.
Key terms
- All-solid-state battery
- A battery that uses a solid electrolyte instead of a liquid electrolyte. It is less flammable and does not leak.
- Solid electrolyte
- A material that, although solid, allows ions to move through it and carries ions inside a battery.
- Interface
- The boundary where different materials meet. In all-solid-state batteries, the boundary between the electrode and the solid electrolyte is especially important.
ResearchResearch themes
The lab studies all-solid-state batteries, which are attracting attention as power sources for next-generation electric vehicles and IoT devices. It conducts basic and applied research focused on the design of "nanoionics," so that ions can be freely controlled to move quickly and be stored in large amounts at interfaces.
*Illustrative imageThe Interface Between Electrode and Solid Electrolyte
A key challenge for all-solid-state batteries is that ions move poorly at the interface between the electrode and the solid electrolyte. The lab works on new bonding methods that bring the interface into firm contact, elucidating the mechanisms of side reactions at the interface during sintering, and measuring interface potential and ion concentration through collaborative research.
*Illustrative imageUsing Lithium Metal as the Negative Electrode
Lithium metal has a theoretical capacity about 10 times that of graphite, which is used in the negative electrode of today's batteries. The lab conducts basic and applied research aimed at a negative electrode that can be charged and discharged repeatedly, by understanding how lithium metal behaves when it deposits and dissolves (plating and stripping) on a solid electrolyte.
*Illustrative imagePutting All-Solid-State Batteries to Practical Use
Toward the practical use of all-solid-state batteries with oxide-based solid electrolytes, the lab conducts research and development on making flexible all-solid-state batteries, which could serve as power sources for IoT devices, at room temperature.
*Illustrative imageDeveloping High-Performance Solid Electrolytes
Using a variety of synthesis methods, the lab develops new solid electrolytes such as oxides, halides, and mixed-anion compounds. It precisely analyzes the single crystals it synthesizes to investigate how ions are conducted, and designs new materials by repeating synthesis and analysis.
MembersFaculty
The members of the Iriyama-Yajima Lab consist of faculty, researchers, secretaries, and PhD, master's, and undergraduate students.As of 2026
- ProfessorYasutoshi Iriyama
- Associate ProfessorTakeshi Yajima
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Lithium Ion Battery Cell - Cylindrical Cell, Prismatic Cell, Pouch Cell” CRBAman / CC BY-SA 4.0 (cropped)
- The Interface Between Electrode and Solid Electrolyte: “Transmission electron microscope (2)” Gannu03 / CC BY-SA 4.0 (cropped)
- Using Lithium Metal as the Negative Electrode: “Lithium paraffin” Tomihahndorf / Public domain (cropped)
- Putting All-Solid-State Batteries to Practical Use: “Electrode Coater” RudolfSimon / CC BY 3.0 (cropped)
- Developing High-Performance Solid Electrolytes: “Cerussite crystal structure (Chevrier-et-al 1992) polyhedra model” Ra'ike (Wikipedia) / CC0 (cropped)
- Related lab (Energy Functional Design Engineering Lab): “Lithium-cobalt-oxide-3D-polyhedra” Ben Mills / Public domain (cropped)
- Related lab (Functional Materials Creation Engineering Lab (Asahi)): “Beta-Barium Orthotitanate crystal structure” WilliamDParker / CC BY-SA 3.0 (cropped)
- Related lab (Materials Composite Process Engineering Lab): “Iss071e ) ---A view the Metal 3D printer that manufactures experimental samples printed with stainless steel aboard the International Space Station's Columbus laboratory module” NASA Johnson Space Center / Public domain (cropped)
- Related lab (Nanostructure Design Process Engineering Lab): “CPO-27 PerspectiveView CrossSection” Canucksplayer (talk) / Public domain (cropped)
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