PROFILE DETAIL

Detailed Profile of Dr. Naoki Matsui

Basic Information

Name:

Naoki Matsui

Position:

Associate Professor

Affiliation:

Dept. of Chemical Science and Engineering, School of Materials and Chemical Technology, Institute of Science Tokyo

Date of Birth:

December 9, 1992

Research Field:

Solid Ionics, Electrochemistry, Solid State Chemistry, Energy Devices

Address:

G1-914, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

E-mail:

matsui.n.ee49[at]m.isct.ac.jp

TEL/FAX:

045-924-5561

Education

Apr 2017 - Mar 2020
Ph.D. (Science)
School of Materials and Chemical Technology, Tokyo Institute of Technology Supervisor: Prof. Ryoji Kanno, (Sub) Prof. Masaaki Hirayama
Apr 2015 - Mar 2017
M.S. (Science)
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Apr 2011 - Mar 2015
B.S.
Department of Applied Chemistry, Waseda University

Career

Jun 2026 - Present
Associate Professor, Institute of Science Tokyo
Oct 2024 - May 2026
Assistant Professor, Institute of Science Tokyo
Apr 2021 - Sep 2024
Assistant Professor, Tokyo Institute of Technology
Apr 2020 - Mar 2021
Postdoctoral Researcher, Tokyo Institute of Technology
Apr 2019 - Mar 2020
JSPS Research Fellow (DC2)

Representative Research Achievements

1. Design and Development of Novel Fluoride Ion Conductors

  • •Developed solid electrolyte candidate materials with excellent ionic conductivity and electrochemical stability in a new crystal structure system (KYb2F7–BaYb2F8 pseudo-binary system) (Chem. Mater., 2025)
  • •First demonstration that dynamic reorientation of Pb 6s2 lone pair electrons promotes ion transport in CsPb0.9K0.1F2.9, using both experimental and computational approaches (J. Mater. Chem. A, 2024)

2. High-Efficiency Materials Discovery Using Machine Learning

  • •Analyzed correlation between local configurations and ionic conductivity of lithium ion conductors based on coordination polyhedra, and developed new lithium ion conductors through molecular dynamics calculations and experimental validation (JACS, 2025)
  • •Developed machine learning model for ionic conductivity prediction based on compositional descriptors, proposed efficient search method for fluoride ion conductors, and discovered first tysonite-type fluoride ion conductor in Sn system: Ba0.2Sn0.8F2 (σ=10–4 S cm–1) (ACS Appl. Energy Mater., 2023)

3. Development of Hydride Ion Conductors and Creation of Hydrogen Storage Devices

  • •Developed a novel solid electrolyte combining electrochemical stability and ionic conductivity, and created a new hydrogen storage device using it (Science, 2025)
  • •Systematically elucidated relationship between cation size and ion migration barriers in perovskite-type SrLiH3 system, developing solid electrolyte with relatively high performance at low temperature (ACS Appl. Energy Mater., 2021)
  • •Systematically elucidated the effect of cation size on hydride ion conduction in K2NiF4-type LnSrLiH2O2 system using neutron diffraction and first-principles calculations (J. Mater. Chem. A, 2020)

Awards

2024
Open Innovator Award (Tokyo Institute of Technology)
2022
Tokyo Tech Challenging Research Award (Tokyo Institute of Technology)
2019
WILEY TOP DOWNLOADED PAPER 2018-2019
2017
Poster Award, The 6th Toyota RIKEN International Workshop
2017
Student Award (Separation Technology Association Annual Meeting)
2016
Masumoto Award (Priority Area "Nanostructure Information")

Research Funding

Principal Investigator

  • ▸
    JST PRESTO (2025-2028)
    Research Area: "Quantum and Electronic Control for Innovative Energy Conversion"
  • ▸
    KAKENHI Grant-in-Aid for Transformative Research Areas (A), Public Offering (2025-2026)
    "Control of Lone Pairs that Inhibit/Promote Ion Transport and Exploration of Superionic Conductors"
  • ▸
    KAKENHI Grant-in-Aid for Early-Career Scientists (2022-2024)
    "Creation of Hydride Ion Conductors Based on Structural Similarity"
  • ▸Tokyo Tech Challenging Research Award (2023)
  • ▸Tokyo Tech IIR Wide-Range Basic Research Academy New Research Challenge Grant (2023)
  • ▸
    KAKENHI Grant-in-Aid for JSPS Fellows (2019-2020)
    "Development of Oxide Ion Conductors Based on High Oxygen Deficiency"

Co-Investigator

  • ▸NEDO Development of Innovative Battery for Electric Vehicles (2021-2025)
  • ▸
    KAKENHI Grant-in-Aid for Scientific Research (B) (2022-2024)
    PI: Prof. Takafumi Yamamoto
  • ▸NEDO Development of Fundamental Technology for Commercialization of Innovative Batteries (2019-2020)

Teaching

Applied Chemistry Laboratory 4: Basic Electrochemistry and Fuel Cells

Guiding students from basic electrochemistry theory to practical applications of fuel cells through experiments.

Academic Activities

Peer Review

Journal of Materials Chemistry AInorganic ChemistrySolid State IonicsElectrochemistryEuropean Journal of Inorganic ChemistryCeramics International

Society Memberships

The Electrochemical Society of JapanSolid State Ionics Society of JapanJapan Society of Applied PhysicsThe Ceramic Society of JapanBattery Technology Committee

Seminar Instructor

  • •Electrochemical Society of Japan - Electrochemistry Seminar A
  • •Electrochemical Society of Japan, Kanto Branch - Basic Seminar
  • •Toyo Corporation Technical Seminar

Research Philosophy

I believe that breakthroughs in energy storage technology come from a deep understanding of the fundamental mechanisms governing ion transport in solids.

By integrating experimental synthesis, advanced characterization techniques, and computational approaches, I aim to design materials that enable safe, high-performance next-generation batteries for a sustainable future.

Hobbies & Others

Outside of research, I enjoy rugby and walking. Time spent exercising also becomes a good opportunity to think about new research ideas.

I am also interested in constantly learning related research fields (MI, electrochemistry, structural analysis) and exploring possibilities for application to materials science.

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