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Arai Lab
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The lab observes reactions inside batteries in situ to create next-generation energy storage devices.
AboutAbout the lab
Taking on the science of energy devices.
Arai Lab takes on the science of energy devices that can transform society.
For batteries, including rechargeable batteries, the lab observes the reactions occurring inside electrodes while the battery is operating (operando).
The lab covers a wide range of battery systems, including zinc negative electrodes, air electrodes that use oxygen as the active material, and all-solid-state batteries.
Based on the problems revealed through observation, the lab improves lifetime and performance, working toward creating new science that opens up the future.
Key terms
- Negative electrode
- The electrode in a battery that sends out electrons during discharge
- Air electrode
- An electrode that uses oxygen in the air as the active material
- All-solid-state battery
- A battery that uses a solid electrolyte instead of a liquid electrolyte
NewsLab news
A student received the Best Poster Award at the Annual Meeting of the International Battery Materials Association
A doctoral student received the Outstanding Poster Award at the Summer School of the Kanto Branch of the Electrochemical Society of Japan
A paper with a student as first author was selected for the cover of J. Mater. Chem. A
ResearchResearch themes
The lab studies energy devices, including rechargeable batteries, by observing in situ the reactions occurring inside electrodes. Countermeasures to the problems that come to light are used to improve lifetime and performance characteristics.
*Illustrative imageDevelopment of rechargeable zinc negative electrodes
By combining in situ optical observation with X-ray diffraction, the lab visualizes the non-uniform deposition reactions that cause electrode shape change. Based on countermeasures to the problems revealed, the lab is working to improve lifetime characteristics.
*Illustrative imageImproving the activity and durability of air electrodes
For air electrodes that use oxygen as the active material, the lab analyzes the reaction sites through in situ resistance measurement. New electrode designs based on this analysis achieve both lower overpotential and higher durability at the same time.
*Illustrative imageNew electrode materials and battery systems
Using soft chemistry methods, the lab uncovers metastable phases that are difficult to obtain otherwise. From these, the lab attempts to create electrodes for new aqueous batteries and unprecedented ion battery systems.
*Illustrative imageElectrochemical measurement of all-solid-state batteries
The lab achieved the world's first reference electrode, which is essential for electrochemical measurement, in an all-solid-state battery system. Using it, the lab extracts the impedance behavior of just one electrode, which leads to proposals of methods for improving performance.
MembersFaculty
The members of Arai Lab consist of faculty, doctoral, master's, and undergraduate students, technical support staff and dispatched researchers, and administrative support staff.As of 2025
- ProfessorHajime AraiPublications ↗
- Assistant ProfessorTakashi HirosePublications ↗
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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 coin cell batteries in laboratory testing fixture” Chingo K / CC BY 4.0 (cropped)
- Development of rechargeable zinc negative electrodes: “Zinc powder particles obtained by electroextraction” Sualur / CC BY 4.0 (cropped)
- Improving the activity and durability of air electrodes: “Bench-Scale Zinc Air Primary Cell” David S. Soriano / CC BY-SA 4.0 (cropped)
- New electrode materials and battery systems: “Pigment Berliner Blau” Saalebaer / CC0 (cropped)
- Electrochemical measurement of all-solid-state batteries: “Duracell DL2032 Coin cell-1231” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Related lab (松田研究室): “Robot arm handles an assay plate” National Institute of Allergy and Infectious Diseases / Public domain (cropped)
- Related lab (館山研究室): “Lithium-cobalt-oxide-3D-polyhedra” Ben Mills / Public domain (cropped)
- Related lab (
青木芳尚研究室): “Perovskite crystal structure” Oregon State University / CC BY-SA 2.0 (cropped) - Related lab (中村研究室): “Chimney-hires” NOAA Vents Program / Public domain (cropped)
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