Organization
Institute of Integrated Research Research Center for All-Solid-State Battery Assistant Professor
Title
Assistant Professor
Homepage
External link
matsui naoki
Research Interests
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materials informatics
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solid-state ionics
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all-solid-state fluoride-ion battry
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solid electrolyte
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all-solid-state battery
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lithium-ion conductor
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hydride-ion conductor
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fluoride-ion conductor
Research Areas
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Nanotechnology/Materials / Energy chemistry
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Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry
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Nanotechnology/Materials / Inorganic materials and properties / イオン伝導
Education
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Tokyo Institute of Technology
2017.4 - 2020.3
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東京工業大学大学院 総合理工学研究科 物質電子化学専攻
2015.4 - 2017.3
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Waseda University School of Advanced Science and Engineering
2011.4 - 2015.3
Research History
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Institute of Science Tokyo Assistant Professor
2024.10
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Tokyo Institute of Technology
2021.4 - 2023.9
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Tokyo Institute of Technology
2020.4 - 2021.3
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Tokyo Institute of Technology
2019.4 - 2020.3
Professional Memberships
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電気化学会
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固体イオニクス学会
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応用物理学会
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日本セラミックス協会
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電池技術委員会
Papers
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Fast hydride-ion conduction in complex hydride Ba2MgH6
Nur Ika Puji Ayu, Naoki Matsui, Yoshitake Toda, Takeya Mezaki, Guangzhong Jiang, Kota Suzuki, Ryoji Kanno
JOURNAL OF MATERIALS CHEMISTRY A 2026.3
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From Composition to Ionic Conductivity: Machine Learning-Guided Discovery and Experimental Validation of Argyrodite-Type Lithium-Ion Electrolytes
Songjia Kong, Ziheng Yu, Naoki Matsui, Michiyo Kamiya, Yudai Iwamizu, Yuki Tanaka, Nobuko Kubota, Kuniharu Nomoto, Satoshi Hori, Masaaki Hirayama, Kota Suzuki, Ryoji Kanno
SMALL 22 ( 2 ) 2026.1
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High-Capacity, Reversible Hydrogen Storage Using H– -Conducting Solid Electrolytes
Takashi Itoh, Guangzhong Jiang, Kazutaka Ikeda, Kota Suzuki, Masaaki Hirayama, Yoyo Hinuma, Takashi Hirose, Naoki Matsui, Ryoji Kanno, Kazuma Gotoh
Science 389 ( 6766 ) 1252 - 1255 2025.9
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Tailoring Polyhedral Linkage in K1–xBaxM2F7+x (M = Yb, Lu) for Enhanced Fluoride-Ion Conductivity
Naoki Matsui, Kazuhiro Mori, Takashi Saito, Kousuke Noi, So Fujinami, Youngwha Park, Takeshi Tojigamori, Kota Suzuki, Takeshi Abe, Ryoji Kanno
Chemistry of Materials 37 ( 13 ) 4798 - 4806 2025.7
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Exploration of Lithium-Ion Conductors Based on Local Coordination Environments Using Crystallographic Site Fingerprints
Songjia Kong, Naoki Matsui, Satoshi Hori, Masaaki Hirayama, Kazuhiro Mori, Takashi Saito, Ryoji Kanno, Kota Suzuki
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 147 ( 28 ) 24336 - 24346 2025.6
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Sn vs. Ge: Effects of Elastic and Plastic Deformation of LGPS-type Solid Electrolytes on Charge-Discharge Properties of Composite Cathodes for All-solid-state Batteries
Kenta WATANABE, Hideaki NAKAYAMA, Han-Seul KIM, Kazuhiro HIKIMA, Naoki MATSUI, Kota SUZUKI, Satoshi OBOKATA, Hiroyuki MUTO, Atsunori MATSUDA, Ryoji KANNO, Masaaki HIRAYAMA
Electrochemistry 93 ( 6 ) 1 - 7 2025.6
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Cover Picture: Self‐Closing of Cracks Generated in Microstructure‐Controlled 400 μm‐Thick Composite Cathodes for All‐Solid‐State Batteries: Observed by InSitu Scanning Electron Microscopy with Energy‐Dispersive X‐Ray Spectroscopy (Batteries & Supercaps 6/2025)
Kenta Watanabe, Han‐Seul Kim, Kazuhiro Hikima, Naoki Matsui, Kota Suzuki, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
Batteries & Supercaps 2025.6
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Self‐Closing of Cracks Generated in Microstructure‐Controlled 400 μm‐Thick Composite Cathodes for All‐Solid‐State Batteries: Observed by In Situ Scanning Electron Microscopy with Energy‐Dispersive X‐Ray Spectroscopy
Kenta Watanabe, Han‐Seul Kim, Kazuhiro Hikima, Naoki Matsui, Kota Suzuki, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
Batteries & Supercaps 8 ( 6 ) 2025.6
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Fluoride-ion conductivity of scheelite-type LiYb1-xMxF4±x (M = Mg, Ca, Sr, Hf)
Kota Onuki, Naoki Matsui, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
SOLID STATE IONICS 424 2025.6
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Hydride Ion Conductors with Polyanionic Complex Anions
Taehyun Kim, Taeseung Kim, Taegyoung Lee, Ye-Eun Park, Jeonghyun Kim, Seoungjae Kang, Hyerim Kim, Seokjae Hong, Naoki Matsui, Hyungsub Kim, Sangryun Kim
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 147 ( 17 ) 14244 - 14253 2025.4
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A trade-off between migration and association energies for hydride-ion conductivity in the SrLiH3-CaLiH3-NaLiH2 system
Takashi Hirose, Naoki Matsui, Kenta Watanabe, Takashi Saito, Kazuhiro Mori, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
DALTON TRANSACTIONS 54 ( 10 ) 4180 - 4186 2025.3
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Simultaneous Exploration of Candidates for Electrode and Electrolyte Materials for All-Solid-State Batteries Using Predicted Rating from a Recommender System
Toshiya Nakayama, Kenta Watanabe, Yudai Iwamizu, Kota Suzuki, Naoki Matsui, Atsuto Seko, Isao Tanaka, Ryoji Kanno, Masaaki Hirayama
ACS APPLIED ENERGY MATERIALS 8 ( 4 ) 2260 - 2267 2025.1
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Chemical Composition-Driven Machine Learning Models for Predicting Ionic Conductivity in Lithium-Containing Oxides
Yudai IWAMIZU, Kota SUZUKI, Michiyo KAMIYA, Naoki MATSUI, Kuniharu NOMOTO, Satoshi HORI, Masaaki HIRAYAMA, Ryoji KANNO
Electrochemistry 93 ( 6 ) 2025
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Oxygen-Substitution Effects on the Properties of Argyrodite-Type Sulfide Solid Electrolytes (Li5.5PS4.5−xBr1.5Ox, 0 ≦ x ≦ 0.5)
Rei TSUKAZAKI, Naoki MATSUI, Satoshi HORI, Kota SUZUKI, Ryoji KANNO
Electrochemistry 93 ( 6 ) 2025
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Interfacial structure changes between amorphous silicon anode/liquid electrolyte using a highly dense and flat model electrode
Sho Asano, Jun-ichi Hata, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Ryoji Kanno, Masaaki Hirayama
JOURNAL OF SOLID STATE ELECTROCHEMISTRY 28 ( 12 ) 4491 - 4501 2024.12
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Synthesis and Structural Characterization of Lithium Ionic Conductors Li2 MS3 (M = Si, Si0.5Ge0.5, Ge) and Li16Ge5S18
Yuki Sasaki, Subin Song, Satoshi Hori, Naoki Matsui, Kuniharu Nomoto, Kota Suzuki, Masaaki Hirayama, Inwoo Song, Yongjun Jang, Ryoji Kanno
CHEMISTRY OF MATERIALS 36 ( 15 ) 7176 - 7185 2024.7
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A composite cathode with a three-dimensional ion/electron-conducting structure for all-solid-state lithium–sulfur batteries Invited Reviewed International journal
Peilu Jiang, Huangkai Zhou, Subin Song, Kota Suzuki, Kenta Watanabe, Yumi Yamaguchi, Naoki Matsui, Satoshi Hori, Ryoji Kanno, Masaaki Hirayama
Communications Materials Volume 5 ( Issue 105 ) 105 2024.6
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"Mechanical Properties of Li 10.35 Ge 1.35 P 1.65 S 12 with Different Particle Sizes"
Hanseul Kim, Kazuhiro Hikima, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
MATERIALS TRANSACTIONS 2024.5
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Formation Processes of a Solid Electrolyte Interphase at a Silicon/Sulfide Electrolyte Interface in a Model All-Solid-State Li-Ion Battery
Sho Asano, Jun-Ichi Hata, Kenta Watanabe, Keisuke Shimizu, Naoki Matsui, Norifumi L. Yamada, Kota Suzuki, Ryoji Kanno, Masaaki Hirayama
ACS APPLIED MATERIALS & INTERFACES 16 ( 6 ) 7189 - 7199 2024.2
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Fluorination/Defluorination Behavior of Y2C in Fluoride-Ion Battery Anodes
Takeshi Tojigamori, Naoki Matsui, Kota Suzuki, Masaaki Hirayama, Takeshi Abe, Ryoji Kanno
ACS APPLIED ENERGY MATERIALS 7 ( 3 ) 1100 - 1108 2024.1
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Effect of Pb 6s2 lone pair on the potential flattening of fluoride-ion conduction in perovskite-type fluoride
Naoki Matsui, Miwa Murakami, Kazuhiro Mori, Takashi Saito, Keisuke Shimizu, Kota Suzuki, Ryoji Kanno
Journal of Materials Chemistry A 12 ( 7 ) 3989 - 3996 2024
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Fabrication and High-temperature Electrochemical Stability of LiFePO4 Cathode/Li3PO4 Electrolyte Interface
Dongho KANG, Kotaro ITO, Keisuke SHIMIZU, Kenta WATANABE, Naoki MATSUI, Kota SUZUKI, Ryoji KANNO, Masaaki HIRAYAMA
Electrochemistry 92 ( 3 ) 2024
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Mechanical Properties of Li10.35Ge1.35P1.65S12 with Different ff erent Particle Sizes
Hanseul Kim, Kazuhiro Hikima, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
MATERIALS TRANSACTIONS 65 ( 8 ) 861 - 866 2024
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Accelerated Exploration of Fast Fluoride-Ion Conductors Based on Compositional Descriptors
Naoki Matsui, Tomoaki Seki, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
ACS Applied Energy Materials 6 ( 22 ) 11663 - 11671 2023.11
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Crack Suppression by Downsizing Sulfide‐Electrolyte Particles for High‐Current‐Density Operation of Metal/Alloy Anodes
Han‐Seul Kim, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Ryoji Kanno, Masaaki Hirayama
Batteries & Supercaps 6 ( 10 ) 2023.10
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Electrochemical and mechanical properties and chemical stability of Li10GeP2S12/Al2O3 composite electrolytes
Takumi Yabuzaki, Miho Sato, Hanseul Kim, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Hori, Kazuhiro Hikima, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 131 ( 10 ) 675 - 684 2023.10
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Direct tracking of reaction distribution in an all-solid-state battery using operando scanning electron microscopy with energy dispersive X-ray spectroscopy Reviewed International journal
Takuma Noda, Hanseul Kim, Kenta Watanabe, Kota Suzuki, Naoki Matsui, Ryoji Kanno, Masaaki Hirayama
Journal of the Ceramic Society of Japan Volume 131 ( Issue 10 ) 651 - 658 2023.10
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High H- Conductivities along the ab-Planes of La2LiHO3 Epitaxial Thin Films
Yuki Sasahara, Takashi Hirose, Masataka Yoshimoto, Naoki Matsui, Shigeru Kobayashi, Hiroki Ubukata, Fumitaka Takeiri, Kota Suzuki, Masaaki Hirayama, Kazunori Nishio, Ryota Shimizu, Ryoji Kanno, Genki Kobayashi, Taro Hitosugi
CRYSTAL GROWTH & DESIGN 23 ( 10 ) 7103 - 7108 2023.9
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A lithium superionic conductor for millimeter-thick battery electrode
Yuxiang Li, Subin Song, Hanseul Kim, Kuniharu Nomoto, Hanvin Kim, Xueying Sun, Satoshi Hori, Kota Suzuki, Naoki Matsui, Masaaki Hirayama, Teruyasu Mizoguchi, Takashi Saito, Takashi Kamiyama, Ryoji Kanno
Science 381 ( 6653 ) 50 - 53 2023.7
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Synthesis and Electrochemical Properties of Quaternary and Quinary γ-Li3PO4-Type Materials: Effects of Compositional Complexity in Lithium Superionic Conductors
Kota Suzuki, Michiyo Kamiya, Naoki Matsui, Satoshi Hori, Masaaki Hirayama, Ryoji Kanno
JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 23 ) 10947 - 10952 2023.6
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Search for Lithium Ion Conducting Oxides Using the Predicted Ionic Conductivity by Machine Learning
Yudai Iwamizu, Kota Suzuki, Naoki Matsui, Masaaki Hirayama, Ryoji Kanno
MATERIALS TRANSACTIONS 64 ( 1 ) 287 - 295 2023
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Material Search for a Li10GeP2S12-Type Solid Electrolyte in the Li-P-S-X (X = Br, I) System via Clarification of the Composition-Structure-Property Relationships
Subin Song, Satoshi Hori, Yuxiang Li, Kota Suzuki, Naoki Matsui, Masaaki Hirayama, Takashi Saito, Takashi Kamiyama, Ryoji Kanno
CHEMISTRY OF MATERIALS 2022.9
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Synthesis, structure, and electrical conductivity of Sr2LiH2N nitride hydride
Guangzhong Jiang, Naoki Matsui, Takeya Mezaki, Yoshitake Toda, Kota Suzuki, Masaaki Hirayama, Takashi Saito, Takashi Kamiyama, Ryoji Kanno
Journal of Solid State Chemistry 310 2022.6
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Anomalously High Ionic Conductivity of Li2SiS3-Type Conductors
Wenze Huang, Naoki Matsui, Satoshi Hori, Kota Suzuki, Masaaki Hirayama, Masao Yonemura, Takashi Saito, Takashi Kamiyama, Yuki Sasaki, Yongsub Yoon, Saheum Kim, Ryoji Kanno
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 144 ( 11 ) 4989 - 4994 2022.3
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Li10GeP2S12-Type Structured Solid Solution Phases in the U9+δP3+δ′S12-kOk System: Controlling Crystallinity by Synthesis to Improve the Air Stability
Miao Xu, Subin Song, Shugo Daikuhara, Naoki Matsui, Satoshi Hori, Kota Suzuki, Masaaki Hirayama, Shinya Shiotani, Shinji Nakanishi, Masao Yonemura, Takashi Saito, Takashi Kamiyama, Ryoji Kanno
INORGANIC CHEMISTRY 61 ( 1 ) 52 - 61 2022.1
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Reversible Charge/Discharge Reaction of a Ternary Metal Fluoride, Pb2CuF6: A Highly Conductive Cathode Material for Fluoride-Ion Batteries Reviewed International journal
Takeshi Tojigamori, Hiroshi Nakajima, Hidenori Miki, Naoki Matsui, Tomotaka Nakatani, So Fujinami, Kousuke Noi, Hirofumi Tsukasaki, Kota Suzuki, Masaaki Hirayama, Shigeo Mori, Takeshi Abe, Ryoji Kanno
ACS Appl. Energy Mater. 5 ( 1 ) 1002 - 1009 2022.1
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Fast Hydride-Ion Conduction in Perovskite Hydrides AELiH3 Reviewed International journal
Takashi Hirose, Takuya Mishina, Naoki Matsui, Kouta Suzuki, Takashi Saito, Takashi Kamiyama, Masaaki Hirayama, Ryoji KANNO
ACS Applied Energy Materials Vol. 5 ( Issue 3 ) 2968 - 2974 2022.1
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High-Pressure Synthesis and Lithium-Ion Conduction of Li4OBr2 Derivatives with a Layered Inverse-Perovskite Structure
Shogo Wakazaki, Qiumin Liu, Randy Jalem, Takumi Nishikubo, Yuki Sakai, Naoki Matsui, Guowei Zhao, Kota Suzuki, Kei Shigematsu, Takafumi Yamamoto, Ryoji Kanno, Hena Das, Yoshitaka Tateyama, Masaki Azuma
CHEMISTRY OF MATERIALS 33 ( 23 ) 9194 - 9201 2021.12
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The effect of cation size on hydride-ion conduction in LnSrLiH2O2 (Ln = La, Pr, Nd, Sm, Gd) oxyhydrides
Naoki Matsui, Yoyo Hinuma, Yuki Iwasaki, Kota Suzuki, Jiang Guangzhong, Haq Nawaz, Yumiko Imai, Masao Yonemura, Masaaki Hirayama, Genki Kobayashi, Ryoji Kanno
Journal of Materials Chemistry A 8 ( 46 ) 24685 - 24694 2020
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Ambient pressure synthesis of La2LiHO3 as a solid electrolyte for a hydrogen electrochemical cell
Naoki Matsui, Genki Kobayashi, Kota Suzuki, Akihiro Watanabe, Akiko Kubota, Yuki Iwasaki, Masao Yonemura, Masaaki Hirayama, Ryoji Kanno
Journal of the American Ceramic Society 102 ( 6 ) 3228 - 3235 2019.6
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Conduction Mechanism of Li10GeP2S12-type Lithium Superionic Conductors in a Li–Sn–Si–P–S System Reviewed International journal
Makoto Inagaki, Kota Suzuki, Satoshi Hori, Kazuhiro Yoshino, Naoki Matsui, Masao Yonemura, Masaaki Hirayama, Ryoji Kanno
Chemistry of Materials Vol. 31 ( No. 9 ) 3485 - 3490 2019.5
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Synthesis, crystal structure, and ionic conductivity of hydride ion- conducting Ln2LiHO3 ( Ln 1/4 La, Pr, Nd) oxyhydrides
Yuki Iwasaki, Naoki Matsui, Kota Suzuki, Yoyo Hinuma, Masao Yonemura, Genki Kobayashi, Masaaki Hirayama, Isao Tanaka, Ryoji Kanno
JOURNAL OF MATERIALS CHEMISTRY A 6 ( 46 ) 23457 - 23463 2018.12
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Stability of Charged Phase and Cell Properties of LiMn2-xAlxO4
Manabu Nishijima, Naoki Matsui, Jun-ichi Hata, Takamitsu Saito, Yoshiaki Nitta, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 165 ( 7 ) A1440 - A1446 2018
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Ambient Pressure Synthesis and H- Conductivity of LaSrLiH2O2
Akihiro Watanabe, Genki Kobayashi, Naoki Matsui, Masao Yonemura, Akiko Kubota, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno
ELECTROCHEMISTRY 85 ( 2 ) 88 - 92 2017.2
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Synthesis and structure of novel lithium-ion conductor Li7Ge3PS12
Yuki Inoue, Kota Suzuki, Naoki Matsui, Masaaki Hirayama, Ryoji Kanno
JOURNAL OF SOLID STATE CHEMISTRY 246 334 - 340 2017.2
Industrial property rights
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フッ化物イオン伝導体、及びフッ化物イオン電池
當寺ヶ盛 健志, 松井 直喜, 菅野 了次
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フッ化物イオン伝導体、負極合材、及びフッ化物イオン電池
當寺ヶ盛 健志, 松井 直喜, 菅野 了次
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フッ化物イオン電池
志茂 祐輔, 松井 直喜, 菅野 了次
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システム
菅野 了次, 松井 直喜, 廣瀬 隆
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金属水素化物、並びにこれを含むヒドリドイオン伝導体及び電池
菅野 了次, 松井 直喜, 廣瀬 隆, 伊藤 昂史
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フッ化物イオン電池用負極活物質、フッ化物イオン電池用負極活物質層、フッ化物イオン電池、フッ化物イオン電池用負極活物質の製造方法
當寺ヶ盛 健志, 松井 直喜
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フッ化物イオン電池用負極活物質、フッ化物イオン電池用負極活物質層、フッ化物イオン電池、フッ化物イオン電池用負極活物質の製造方法
當寺ヶ盛 健志, 松井 直喜
Awards
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オープンイノベータ功労賞
2024 東京工業大学
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東工大挑戦的研究賞
2022 東京工業大学
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WILEY TOP DOWNLOADED PAPER 2018-2019
2019 WILEY
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学生賞
2017 分離技術年会
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Poster Award
2017 The 6th Toyota RIKEN International Workshop
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増本賞
2016 新学術領域「ナノ構造情報」
Research Projects
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実空間と仮想空間が相互連携した固体電解質探索手法の開拓
Grant number：26K01209 2026.4 - 2029.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
松井 直喜
Grant amount：\18330000 （ Direct Cost: \14100000 、 Indirect Cost：\4230000 ）
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イオン輸送を阻害/促進する孤立電子対の制御と超イオン導電体の探索
Grant number：25H01964 2025.4 - 2027.3
日本学術振興会 科学研究費助成事業 学術変革領域研究(A)
松井 直喜
Grant amount：\9620000 （ Direct Cost: \7400000 、 Indirect Cost：\2220000 ）
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2025 - 2028
科学技術振興機構 戦略的な研究開発の推進 戦略的創造研究推進事業 さきがけ
松井 直喜
Authorship：Principal investigator
本研究では、イオン導電体における孤立電子対の動的な「ゆらぎ」がイオン輸送に及ぼす影響を解明し、孤立電子対ゆらぎを制御することで超イオン導電体の創出を目指します。元素や構造ごとに異なる孤立電子対の立体化学的活性と、その時空間的ゆらぎがイオン輸送に与える影響を明らかにします。さらに、孤立電子対ゆらぎを増強するための材料設計指針を確立し、実際の材料探索を通じて、優れたイオン導電率を持つ超イオン導電体の開発を目指します。
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Development of Hydride Ion Conductors Based on Structural Similarity
Grant number：22K14472 2022.4 - 2025.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
Matsui Naoki
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
Toward the development of new hydride ion conductors exhibiting high ionic conductivity, materials exploration based on structural similarity was performed. An efficient method for identifying superionic conductor structures was developed. By defining structural similarity based on coordination numbers between cations and anions, and using this similarity for cluster analysis, structural groups with frameworks similar to superionic conductors were identified. Focusing on framework structures known in other anion conductors from these structural groups, we synthesized new hydride materials showing high hydride ion conductivity. In particular, the perovskite-type Sr0.8Na0.2LiH2.8 achieved an ionic conductivity of 5.1 × 10-6 S cm-1 at 25 °C.
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特異なアニオン欠損面を持つ新規ペロブスカイトの開拓
Grant number：22H01767 2022.4 - 2025.3
日本学術振興会 科学研究費助成事業 基盤研究(B)
山本 隆文, 松井 直喜, 池澤 篤憲
Grant amount：\17420000 （ Direct Cost: \13400000 、 Indirect Cost：\4020000 ）
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Investigation for novel perovskite compounds with unusual anion-deficient plane
Grant number：23K23035 2022.4 - 2025.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Takafumi Yamamoto
Grant amount：\17420000 （ Direct Cost: \13400000 、 Indirect Cost：\4020000 ）
In this study, we focused on perovskites with (111)p-plane defects by rationally combining octahedral and tetrahedral-preferring metals to synthesise novel materials and explore their physical properties. As a result, we successfully synthesized SrV0.3Fe0.7O2.8, which exhibits a negative magnetoresistance at room temperature, and reported in Inorganic Chemistry. The structure and physical properties of this compound at low temperatures were also clarified and the results were reported in CrystEngComm. In addition, novel compounds Ba6Ta2Na2X2O17 (X = P, V) were also synthesised and reported in Inorganic Chemstry.
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高酸素欠損組成を基軸とする新規イオン導電体の探索
Grant number：19J14915 2019.4 - 2021.3
日本学術振興会 科学研究費助成事業 特別研究員奨励費
松井 直喜
Grant amount：\1700000 （ Direct Cost: \1700000 ）
高濃度の陰イオン空孔導入の指針の元、優れた導電特性を示す固溶体La2Li1-xMgxO3.5+x/2を新たに見出すと共に、空孔濃度及び空孔の配列様式がイオン導電特性に及ぼす影響を詳細に検討した。さらに、酸化物イオン導電体La2LiO3.5の誘導体であるヒドリドイオン(H-)導電体への展開を図った。酸化物イオンとヒドリドイオンが陰イオン副格子を形成する酸水素化物LnSrLiH2O2における構成元素種とヒドリドイオン導電特性の関係を系統的に評価した。
中性子回折及び放射光X線回折データを用いた構造解析により、酸化物イオン導電体La2Li1-xMgxO3.5+x/2における規則配列の様式を新たに決定した。酸素が多量に欠損したLa2LiO3.5における酸素空孔の規則配列の存在を明らかにすると共に、異元素置換による酸素空孔の不規則配列化が可能であること、不規則配列化に伴いイオン導電率が向上することを見出した。これまで導電機構の理解が浅く、イオン導電率向上の指針が欠如していたヒドリドイオン導電体に対して、系統的なアプローチにより希土類元素のサイズ効果を明確に示した。今後のヒドリドイオン導電体開発を加速させる重要な知見を得た。
Teaching Experience
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応化専門実験第4 基礎電気化学と燃料電池
Media Coverage
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水素を低温・高容量・可逆的に吸蔵・放出する電気化学デバイスを開発 Internet
Academic Activities
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電気化学会 電気化学セミナーA 講師
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電気化学会関東支部 基礎セミナー 講師
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東陽テクニカ 技術セミナー 講師