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Solid Electrolytes and All-Solid-State Batteries Lab
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A lab that explores all-solid-state sodium-ion batteries and new functional materials based on ceramics.
AboutAbout the lab
Ceramic materials, approached from a broad perspective
The Hayashi Lab studies ceramic materials that contribute to the fields of energy, electronics, and the environment.
It takes a broad view that spans how materials are made (processing), their applications, and the functions of the materials themselves, and it trains experts in this field.
Its research covers oxide-based all-solid-state sodium-ion batteries, piezoelectrics and ferroelectrics with new mechanisms, and ceramics in which reactive anions play a role.
The lab emphasizes hands-on experience that draws on all five senses and craftsmanship, from firing ceramics to building vacuum equipment in-house.
Key terms
- Solid electrolyte
- Among the substances that carry ions inside a battery, one that is solid. This lab works with oxides that conduct sodium ions.
- Sintering
- A process in which ceramic powder is heated at high temperature to consolidate it. In this research, lowering the sintering temperature is a key challenge.
- Ferroelectric
- A material with an electric polarization whose direction can be switched by an external field. The lab studies it together with piezoelectrics.
ResearchResearch themes
The Hayashi Lab centers on ceramic materials and studies next-generation secondary batteries, piezoelectrics and ferroelectrics with new mechanisms, and ceramics in which reactive anions play a role. For batteries, it aims to realize oxide-based all-solid-state sodium-ion batteries.
*Illustrative imageNext-generation all-solid-state sodium batteries
Toward oxide-based all-solid-state sodium-ion batteries, the lab studies new solid electrolytes, electrode materials, and battery design. It aims for electrolytes that lower the sintering temperature while retaining high sodium-ion conductivity at room temperature.
*Illustrative imagePiezoelectrics and ferroelectrics with new mechanisms
By using the rotation and distortion of anion coordination polyhedra, the lab aims to establish design guidelines for piezoelectrics and ferroelectrics that differ from conventional types, combining theoretical calculations and experiments.
*Illustrative imageCeramics in which reactive anions play a role
Crystals such as 12CaO·7Al2O3 (C12A7) have nanosized cages that incorporate anions, which allows them to take in reactive chemical species that rarely exist under normal conditions. The lab is searching for new materials with functions derived from hydride ions and electrons.
MembersFaculty
The Hayashi Lab's members are faculty, technical staff, doctoral, master's, and undergraduate students, and research students.As of 2026
- ProfessorKatsuro Hayashi
- Associate ProfessorHirofumi Akamatsu
- Assistant ProfessorJian Wang
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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: “Na-ion battery scientist1” Tavo Romann / CC BY 4.0 (cropped)
- Next-generation all-solid-state sodium batteries: “Sodium metal conducting electricity” Keresluna / CC BY-SA 4.0 (cropped)
- Piezoelectrics and ferroelectrics with new mechanisms: “Piezoelectric Quartz Crystals ( )” National Institute of Standards and Technology / Public domain (cropped)
- Ceramics in which reactive anions play a role: “Powder pink sake set 4pcs” Ken from Lisle, IL, USA / CC BY 2.0 (cropped)
- Related lab (〈プロトン伝導性酸化物〉): “Electrolysis Apparatus” Ivan Akira / CC BY-SA 3.0 (cropped)
- Related lab (〈機能性ナノ膜・CO2分離〉): “Nanostars” Julia Glazkova / CC BY 4.0 (cropped)
- Related lab (〈イオン伝導性セラミックス〉): “Breakdown of a ceramic tube” Korzhenkozos / CC BY 4.0 (cropped)
- Related lab (イオン伝導性セラミックス
（兵頭 潤次） ): “KSC-06pd0005 - Technicians working on fuel cell in OPF” Kim Shiflett / Public domain (cropped)
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