Research Center for All-Solid-State Battery
Institute of Innovative Research, Tokyo Institute of Technology

Arai Laboratory


Professor Hajime Arai
Assistant Professor
Atsunori Ikezawa
Assistant Professor
Takeyoshi Okajima

Creation of energy device science using electrochemistry and in-situ measurements

The Arai Laboratory is creating technologies to realize long-life, highly-safe and low-cost energy storage devices for the widespread use of electric vehicles with low environmental impact and electricity storage derived from renewable energy such as solar and wind power to suit people’s lifestyles.

In all-solid-state lithium-ion batteries, we succeeded in developing the world’s first reference electrode, which is indispensable for electrochemical measurements, and are promoting analysis of the reaction process using the AC impedance method and other methods.

We are also focusing on the development of in-situ/operando measurement technology using X-ray diffraction, confocal optics and neutron diffraction using government facilities, to clarify the behavior of storage batteries under operating conditions, identify issues, and obtain hints for improving their characteristics.

We will continue to improve the characteristics of next-generation energy storage devices by combining electrochemistry, material science, and advanced analytical technologies, and will challenge the creation of new science that will open up the future.

Development of Reference Electrodes for All-Solid-State Batteries

In-situ observation of electrodes using optics

Elucidation of metal precipitation/dissolution mechanism

High performance with functionally separated electrodes

Representative Papers

  1. “Performance of Li4Ti5O12-based reference electrode for the electrochemical analysis of all-solid-state lithium-ion batteries”, Atsunori Ikezawa, Goro Fukunishi, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno and Hajime Arai, Electrochemistry Communications, 116, 10673_1-5 (2020).
  2. “Occurrence of shape change in rechargeable alkaline zinc electrodes observed by operando confocal optics and X-ray diffraction“, Atsunori Ikezawa, Masato Horiuchi and Hajime Arai
    Journal of Power Sources, 570, 230291_1-10 (2021).
  3. “Effects of Aluminum Substitution in Nickel-rich Layered LiNixAl1-xO2 (x=0.92, 0.95) Positive Electrode Materials for Li-Ion Batteries on High-Rate Cycle Performance“, Haruki Kaneda, Yuki Furuuchi, Atsunori Ikezawa and Hajime Arai, Journal of Materials Chemistry A, 9, 21981-21994 (2021).

Tokyo Institute of Technology the Institute of Innovate Research (IIR) School of Materials and
Chemical Technology
Department of Chemical Science
and Engineering
FACES Tokyo Tech Researchers
Ryoji Kanno
The Electrochemical Society of Japan The Ceramic Society of Japan The Chemical Society of Japan Solid State Ionics of Japan THE COMMITTEE OF
Japan Society of Powder and
Powder Metallurgy
化学電池材料研究会 Solid State Chemistry Laboratory Imanishi Lab, Mie University NIMS