Researcher Information



Novel materials for innovative battery system

Department of Chemistry, Inorganic and Analytical Chemistry


Development of novel solid state ionics materials for next-generation battery chemistries

FieldInorganic materials chemistry, Solid state chemistry, Electrochemistry, Thermochemistry
KeywordSolid state ionics, Rechargeable battery, Inorganic solid state electrolyte, Insertion materials, Phase transition, Electrodeposition of less-noble metal

Introduction of Research

Rechargeable batteries are the most critical devices for energy and environmental issues. Solid state Ionics materials, which conduct electricity through ionic conduction in the solid phase, determine the electrochemical properties of the battery systems. We have been trying to find new insertion materials with Na+ or Mg2+ ions as the carrier ions to develop the next generation battery chemistry. Understanding the electrochemical reaction process of these new materials is our interest. We also study ionic conduction properties through solid-solid hetero-interfaces. We focus on the materials design and synthesis process development to obtain the ideal solid-solid hetero-interface with fast ion conduction.

A P3-type layered cathode active material with improved reversibility at high electrode potential via Ca substitution.
Highly reversible Mg3Bi2 intermetallic anode with the visualized Mg2+ ion conduction pathway by BVS method.
Reversible phase transition of the garnet type lithium-ion conductor Li7La3Zr2O12 at high temperature and its electrical conductivity.

Representative Achievements

Ca-substituted P3-type NaxNi1/3Mn1/3Co1/3O2 as a potential high voltage cathode active material for sodium-ion batteries, M. Matsui, F. Mizukoshi, H. Hasegawa and Nobuyuki Imanishi, J. Power Sources, 2021, 485, 229346
An experimental and first-principle investigation of the Ca-substitution effect on P3-type layered NaxCoO2, Y. Ishado, H. Hasegawa, S. Okada, M. Mizuhata, H. Maki and M. Matsui, Chem. Commun., 2020, 56, 8107-8110
Destabilized passivation layer on magnesium-based intermetallics as potential anode active materials for magnesium ion batteries, M. Matsui, H. Kuwata, D. Mori, N. Imanishi and M. Mizuhata, Frontiers in Chemistry, 2019, 7, article 7
A reversible dendrite-free high-areal-capacity lithium metal electrode, H. Wang, M. Matsui, H. Kuwata, H. Sonoki, Y. Matsuda, X. Shang, Y. Takeda, O. Yamamoto and N. Imanishi, Nature Commun., 2017 8 15106
Phase Stability of Garnet-type Lithium Ion Conductor: Li7La3Zr2O12, M. Matsui, K. Takahashi, K. Sakamoto, A. Hirano, Y. Takeda, O. Yamamoto and N. Imanishi, Dalton Trans., 2014, 43, 1019-1924

Related industries

Chemical industry, Electrical industry, Automotive industry, Energy industry, Ceramics industry
Academic degreePh.D.
Self Introduction

My home town is in Kyoto. Since I graduated Department of materials science and engineering at Kyoto University, I learned "Inorganic Chemistry" via my research activities. I have been working on advanced battery materials research after my master course research. I play the electric guitar. My favorite guitarists are Nuno Bettencourt, Steve Vai, and Jeff Beck.

Academic background1999 B.Sc. in Engineering, Kyoto University
2001 M.Sc. In Engineering Kyoto University
2001 Engineer, Toyota Motor Corporation
2008 Ph.D. in Engineering, Tokyo Metropolitan University
2008 Manager, Toyota Research Institute of North America
2012 Specially Appointed Associate Professor, Mie University
2013 PREST Researcher, Japan Science and Technology Agency
2015 Associate Professor, Mie University
2016 Associate Professor, Kobe University
2018 Affiliate Scientist, Lawrence Berkeley National Laboratory
2021 Professor, Department of Chemistry Hokkaido University
Affiliated academic societyThe Electrochemical Society Japan, The Electrochemical Society, The Chemical Society of Japan, The Ceramic Society of Japan, The Solid State Ionics Society of Japan
ProjectGrant-in Aid for Scientific Research on Innovative Areas, MEXT, Japan Science on Interfacial Ion Dynamics for Solid State Ionics Devices
Japan Science and Technology Agency, Advanced Low Carbon Technology Research and Development Program, Specially Promoted Research for Innovative Next Generation Batteries (ALCA-SPRING)
Elements Strategy Initiative for Catalysts and Batteries (ESICB)
Room addressScience Building 6 Room 6-4-03


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