Organization
School of Materials and Chemical Technology Visiting Associate Professor
Title
Visiting Associate Professor
Homepage
External link
Ikezawa Atsunori
Degree
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Ph.D. ( Kyoto University )
Research Interests
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Electrochemistry
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Secondary Batteries
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Electrocatalyst
Research Areas
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Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electron device and electronic equipment
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Nanotechnology/Materials / Energy chemistry
Education
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Kyoto University Graduate School of Engineering Department of Energy and Hydrocarbon Chemistry
2015.4 - 2018.3
Country： Japan
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Kyoto University Graduate School of Engineering Department of Energy and Hydrocarbon Chemistry
2013.4 - 2015.3
Country： Japan
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Kyoto University Faculty of Engineering School of Industrial Chemistry
2009.4 - 2013.3
Country： Japan
Research History
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Tokyo Metropolitan University Associate Professor
2025.4
Country：Japan
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Institute of Science Tokyo
2025.4
Country：Japan
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Institute of Science Tokyo Assistant Professor
2024.10 - 2025.3
Country：Japan
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ブラウンシュヴァイク工科大学 訪問研究員
2023.9 - 2023.12
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Tokyo Institute of Technology Assistant Professor
2018.4 - 2024.9
Country：Japan
Papers
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Selective Pore Sealing of Anodic Porous Alumina by Atomic Layer Deposition of TiO2 Layer
Kyoichi Kohashi, Atsunori Ikezawa, Takashi Yanagishita
Langmuir 2026.3
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Local Potential Indicators for Alkaline Oxygen Electrodes
Nanako NONAKA, Atsunori IKEZAWA, Takeyoshi OKAJIMA, Hajime ARAI
Electrochemistry 2026
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Reconstructing the electrochemistry of lithium-ion batteries through operando diffuse reflectance spectroscopy
Arvind Pujari, Gratsiela Kostova, Hwee Jien Tan, Atsunori Ikezawa, Hajime Arai, Michael De Volder
Energy & Environmental Science 2026
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Low-temperature active site formation for oxygen reduction reaction in (Fe, N)-doped carbon black via rapid thermal annealing
Guanyu Wang, Lijie Zhang, Atsunori Ikezawa, Hajime Arai, Keiko Waki
Carbon Trends 2025.12
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Comparison of 3D-Structured and Mesoporous Carbon as Host Material for Conversion/Alloy Active Material-Anodes with ZnO Using Operando Methods
Jan Petit, Philipp Heugel, Julian Jakob Alexander Kreissl, Kohei Miyazaki, Takeshi Abe, Atsunori Ikezawa, Hajime Arai, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Franziska Klein, Jens Tübke, Jürgen Janek, Daniel Schröder
ACS Applied Energy Materials 2025.10
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Highly active LMO/Ni(Fe)-LDH bifunctional gas-diffusion electrode with bilayer design
Rui Liu, Atsunori Ikezawa, Moritz Borkenhagen, Takeyoshi Okajima, Daniel Schröder, Hajime Arai
Journal of Power Sources 2025.10
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Influence of Perovskite Catalysts and Carbon Graphitization on Carbon Oxidation under Oxygen Evolution Reaction Conditions: A DEMS Study
Jiayuan Ni, Yuto Miyahara, Ryo Sakamoto, Changhee Lee, Kohei Miyazaki, Atsunori Ikezawa, Hajime Arai, Takeshi Abe
Journal of The Electrochemical Society 2025.9
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Operando Confocal Microscopy of Structured Battery Electrodes
Arvind Pujari, Kumar Raju, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Atsunori Ikezawa, Hajime Arai, Michael De Volder
Journal of The Electrochemical Society 2025.7
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Application of Potassium Pyrophosphate Aqueous Electrolytes to Nickel Metal Hydride Batteries
Hiroshi Suyama, Shigeki Sato, Tomoya Matsunaga, Toshihiko Inoue, Atsunori Ikezawa, Hajime Arai
ACS Applied Energy Materials 2025.4
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Chemistry and Electrochemistry | Zinc Reviewed
J.-Y. Huo, Atsunori Ikezawa, Hajime Arai
Encyclopedia of Electrochemical Power Sources (Second Edition) 1 852 - 863 2025.1
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Mitigation of resistance increase in positive electrodes of lithium-ion batteries during floating–cycling by operating voltage control
Tetsuya Omiya, Atsunori Ikezawa, Keita Takahashi, Keiichi Saito, Masao Yonemura, Takashi Saito, Takashi Kamiyama, Kazuhiro Mori, Hajime Arai
EES Batteries 2025
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How do pore sizes affect the oxygen reduction reaction kinetics of platinum electrodes?
Kota Nakahara, Atsunori Ikezawa, Junichi Inamoto, Takeyoshi Okajima, Hajime Arai
Journal of Materials Chemistry A 2025
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Batteries – Battery Types – Zinc Batteries | Zinc–Air Reviewed
Hajime Arai, Atsunori Ikezawa, Jean-Francois Drille
Encyclopedia of Electrochemical Power Sources (Second Edition) 3 851 - 864 2025
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Electrochemical Devices | Metal-Air Batteries
Hajime Arai, Atsunori Ikezawa
Encyclopedia of Electrochemical Power Sources 292 - 300 2025
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Lithium Batteries – Lithium Secondary Batteries – Li-ion Battery | Positive Electrode: Lithium Cobalt Oxide
Hajime Arai, Atsunori Ikezawa
Encyclopedia of Electrochemical Power Sources 218 - 225 2025
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Operando XRD Observation of NMC Cathode for Reaction Distribution Analysis Under Fast Discharging
Masataka Mashino, Atsunori Ikezawa, Marina Murakami, Takeshi Shimomura, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Analysis of Species Concentrations in Bifunctional Air Electrodes Using Mathematical Modeling and Simulation
Atsunori Ikezawa, Kotaro Seki, Moritz Borkenhagen, Hajime Arai, Daniel Schröder
ECS Meeting Abstracts 2024.11
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Designing Bifunctional Bilayer Air Electrode for Zinc−Air Batteries
Rui Liu, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Electrochemical Analyses of the Li-Ion Transfer Resistances at the Chloride Solid Electrolyte | Sulfide Solid Electrolyte Interfaces
Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Shoma Yanagihara, Saneyuki Ohno, Hajime Arai
ECS Meeting Abstracts 2024.11
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Indicators for Optical Analysis of Local Conditions in Bifunctional Air Electrodes
Nanako Nonaka, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Elucidation of Degradation Mechanism of Lithium-Ion Batteries Under High Temperature Environment
Tomohiro Osaki, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Quantitative Differential Electrochemical Mass Spectroscopy Analysis of Electrochemical Carbon Corrosion Reactions in Alkaline Electrolyte Solutions
Shugo Shimizu, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Effect of Micro- and Mesopore Size on Electronic Structure and Oxygen Reduction Kinetics of Platinum
Kota Nakahara, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Oxygen Evolution Reaction Activity of Highly Crystalline Hydrated Cobalt Oxyhydroxide Synthesized with Soft Chemistry
Haruhisa Nakata, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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(Fe, N)-Doped Carbon Black Catalysts for Oxygen Reduction Reaction Applied to Gas-Diffusion Electrodes
Guanyu Wang, Atsunori Ikezawa, Keiko Waki, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Charge-Discharge Behavior of Spinel-Type Manganese Dioxide for Positive Electrode Materials for Aqueous Proton Batteries
Yusuke Kida, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ECS Meeting Abstracts 2024.11
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Reduced artifacts in dynamic electrochemical impedance spectroscopy applied to battery degradation analysis
Davide Cavaliere, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
Journal of Power Sources 2024.11
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Effect of Cobalt Substitution on the Activation of the LiNiO2 Discharge Reaction
Haruki Kaneda, Yuki Furuichi, Tomohiro Yoshida, Atsunori Ikezawa, Hajime Arai
Inorganic Chemistry 2024.9
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An all-solid-state electrochemical four-electrode cell–Application to Li-ion transport between two sulfide solid electrolytes
Kotaro Yoshida, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
Electrochimica Acta 2024.9
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Diagnosis of Li-ion battery degradation based on resistive and diffusion-related transient voltage changes at early stage of discharge
Davide Cavaliere, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
Journal of Power Sources 603 234441 - 234441 2024.5
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Enhanced Oxygen Reduction Activity of Platinum Micropore
Kota Nakahara, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai
ChemElectroChem 2024.3
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Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes
Chihiro YAMAMOTO, Atsunori IKEZAWA, Takeyoshi OKAJIMA, Hajime ARAI
Electrochemistry 2024.2
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Quantitative DEMS analysis of CO2 evolution reactions in alkaline electrolyte solutions
Atsunori Ikezawa, Juri Kida, Kohei Miyazaki, Hajime Arai
Electrochemistry Communications 2024.2
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Soft chemistry-derived Al-substituted hydrated nickel hydroxide electrodes for rechargeable aqueous batteries
Kento Imai, Atsunori Ikezawa, Shigeki Sato, Hajime Arai
Chemical Communications 2024
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Shumpei KUBOTA, Wooseok KANG, Manabu KODAMA, Atsunori IKEZAWA, Hajime ARAI, Shuichiro HIRAI
Transactions of the JSME (in Japanese) 2024
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Combination of float charging and occasional discharging to cause serious LIB degradation analyzed by operando neutron diffraction
Tetsuya Omiya, Atsunori Ikezawa, Keita Takahashi, Keiichi Saito, Masao Yonemura, Takashi Saito, Takashi Kamiyama, Hajime Arai
Energy Advances 2024
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Operando X-Ray Imaging of the Charge-Discharge Behavior of Zinc-Air Batteries
Wooseok KANG, Shumpei KUBOTA, Manabu KODAMA, Atsunori IKEZAWA, Hajime ARAI, Shuichiro HIRAI
Electrochemistry 2024
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Superior oxygen evolution reaction activities of highly crystalline Ni1−xFex-LDH (0.20 ≤ x ≤ 0.51) synthesized using soft chemistry
Atsunori Ikezawa, Shinji Koito, Hajime Arai
Journal of Materials Chemistry A 2024
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Phase Transition Behavior of Biphasic Systems Affected By the Charge-Transfer Process
Chihiro Yamamoto, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2023.12
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Enhanced Kinetics of Oxygen Reduction Reactions in Alkaline Solutions inside Mesoporous Electrodes
Kota Nakahara, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2023.12
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Quantitative Analysis of CO2 Evolution in an Alkaline Electrolyte Solution By Differential Electrochemical Mass Spectroscopy
Atsunori Ikezawa, Juri Kida, Shugo Shimizu, Hajime Arai
ECS Meeting Abstracts 2023.12
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Anticrystallization and Superionic Conduction of Highly Concentrated Potassium Pyrophosphate Aqueous Electrolytes
Hiroshi Suyama, Shigeki Sato, Tomoya Matsunaga, Toshihiko Inoue, Atsunori Ikezawa, Hajime Arai
ACS Applied Energy Materials 2023.12
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Impedance Analysis and Cyclability Evaluation of Graphite Composite Electrodes with All-Solid-State Three-Electrode Cells
Goro Fukunishi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai
ACS Applied Energy Materials 2023.11
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Operando X-Ray Imaging of Gas-Electrolyte Behavior in the Zinc-Air Batteries
Wooseok Kang, Manabu Kodama, Atsunori Ikezawa, Hajime Arai, Shuichiro Hirai
ECS Meeting Abstracts 2023.8
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Selective Synthesis of Perovskite Oxyhydrides Using a High-Pressure Flux Method
Jinya Suzuki, Hiroyasu Okochi, Naoki Matsui, Teppei Nagase, Haruki Tochizawa, Hiroki Sahara, Takumi Nishikubo, Yuki Sakai, Takuya Ohmi, Zhao Pan, Takashi Saito, Hiroyuki Saitoh, Atsunori Ikezawa, Hajime Arai, Ryoji Kanno, Takafumi Yamamoto, Masaki Azuma
Journal of the American Chemical Society 145 ( 30 ) 16398 - 16405 2023.8
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AC impedance analysis of NCM523 composite electrodes in all-solid-state three electrode cells and their degradation behavior
Goro Fukunishi, Mayu Tabuchi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai
Journal of Power Sources 2023.4
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A high voltage aqueous proton battery using an optimized operation of a MoO3 positive electrode
Atsunori Ikezawa, Yukinori Koyama, Tadaaki Nishizawa, Hajime Arai
Journal of Materials Chemistry A 2023
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Single-Crystal-like Durable LiNiO2 Positive Electrode Materials for Lithium-Ion Batteries
Haruki Kaneda, Yuki Furuichi, Atsunori Ikezawa, Hajime Arai
ACS Applied Materials & Interfaces 2022.11
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Oxygen Reduction Activity and Interfacial Structures of La0.8Sr0.2CoO3 at Initial Electrochemical Process in an Alkaline Solution
Akira MATSUZAKI, Masaaki Hirayama, Shouya OHGUCHI, Mamoru KOMO, Atsunori IKEZAWA, Kota SUZUKI, Kazuhisa TAMURA, Hajime ARAI, Ryoji KANNO
Electrochemistry 90 ( 10 ) 107001 - 107001 2022.10
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Rational Placement of Catalysts for Oxygen Reduction and Evolution Reactions Based on the Reaction Sites in Porous Gas Diffusion Electrodes Reviewed
Atsunori Ikezawa, Kotaro Seki, Hajime Arai
ECS Meeting Abstracts 2022.10
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Phase Transition Behavior of LiFePO4 in Non-Aqueous and Aqueous Electrolytes Reviewed
Chihiro Yamamoto, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2022.10
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Impact of Hydrogen Peroxide on Carbon Corrosion in Aqueous KOH Solution
Atsunori IKEZAWA, Kohei MIYAZAKI, Tomokazu FUKUTSUKA, Takeshi ABE
Electrochemistry 2022.1
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Design of bifunctional air electrodes based on the reaction fields between oxygen reduction reaction and oxygen evolution reaction
Atsunori Ikezawa, Kotaro Seki, Hajime Arai
Electrochimica Acta 394 2021.10
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(Invited) Chimie Douce for Variety of Layered Materials Reviewed
Hajime Arai, Kento Imai, Tadaaki Nishizawa, Atsunori Ikezawa
ECS Meeting Abstracts 2021.10
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Synthesis and Electrochemical Performances of Ni-Rich LiNixAl1 –XO2 (x=0.95, 0.92) Positive Electrode Materials for Li-Ion Batteries Reviewed
Haruki Kaneda, Yuuki Furuichi, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2021.10
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Occurrence of shape change in rechargeable alkaline zinc electrodes observed by operando confocal optics and X-ray diffraction
Atsunori Ikezawa, Masato Horiuchi, Hajime Arai
Journal of Power Sources 507 230291 - 230291 2021.9
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Operando Optical Analysis of LiFePO4 Composite Electrodes
Hajime Arai, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Atsunori Ikezawa
The Journal of Physical Chemistry C 125 ( 7 ) 3776 - 3780 2021.2
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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 Furuichi, Atsunori Ikezawa, Hajime Arai
Journal of Materials Chemistry A 2021
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Operando Observation of Zinc Negative Electrode Using Confocal Optical System and X-Ray Diffraction Reviewed
Atsunori Ikezawa, Masato Horiuchi, Hajime Arai
ECS Meeting Abstracts {MA}2020-02 ( 2 ) 175 - 175 2020.11
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All-Solid-State Three-Electrode Cells with Reduced Li4Ti5O12 Reference Electrode Reviewed
Goro Fukunishi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai
ECS Meeting Abstracts {MA}2020-02 ( 5 ) 1011 - 1011 2020.11
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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, Hajime Arai
Electrochemistry Communications 116 106743 - 106743 2020.7
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Local Reactions in Bifunctional Air Electrodes for Aqueous Metal-Air Secondary Batteries Reviewed
Atsunori Ikezawa, Kohei Miyazaki, Tomokazu Fukutsuka, Hajime Arai, Takeshi Abe
ECS Meeting Abstracts {MA}2019-03 ( 2 ) 129 - 129 2019.2
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Optical Observation of LiFePO4 Electrode Inhomogeneity Reviewed
Hajime Arai, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Atsunori Ikezawa
ECS Meeting Abstracts 2019.2
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Local current distributions on electrodes covered with anion-exchange films Reviewed
Atsunori Ikezawa, Kohei Miyazaki, Tomokazu Fukutsuka, Takeshi Abe
Chemistry Letters 47 ( 2 ) 171 - 174 2018
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Direct measurements of local current distributions on electrodes covered with thin liquid electrolyte films Reviewed
Atsunori Ikezawa, Kohei Miyazaki, Tomokazu Fukutsuka, Takeshi Abe
ELECTROCHEMISTRY COMMUNICATIONS 84 53 - 56 2017.11
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Investigations of Electrochemically Active Regions in Bifunctional Air Electrodes Using Partially Immersed Platinum Electrodes Reviewed
Atsunori Ikezawa, Kohei Miyazaki, Tomokazu Fukutsuka, Takeshi Abe
JOURNAL OF THE ELECTROCHEMICAL SOCIETY 162 ( 8 ) A1646 - A1653 2015
Presentations
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Phase Transition Behavior of LiFePO4 in Non-Aqueous and Aqueous Electrolytes
Chihiro Yamamoto, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2022.10
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Development of MoO3-Based Proton Batteries
Atsunori Ikezawa, Tadaaki Nishizawa, Yukinori Koyama, Hajime Arai
ECS Meeting Abstracts 2022.10
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Synthesis and Electrochemical Performances of Ni-Rich LiNixAl1 –XO2 (x=0.95, 0.92) Positive Electrode Materials for Li-Ion Batteries
Haruki Kaneda, Yuuki Furuichi, Atsunori Ikezawa, Hajime Arai
ECS Meeting Abstracts 2021.10
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(Invited) Chimie Douce for Variety of Layered Materials
Hajime Arai, Kento Imai, Tadaaki Nishizawa, Atsunori Ikezawa
ECS Meeting Abstracts 2021.10
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All-Solid-State Three-Electrode Cells with Reduced Li4Ti5O12 Reference Electrode
Goro Fukunishi, Atsunori Ikezawa, Takeyoshi Okajima, Fusao Kitamura, Kota Suzuki, Masaaki Hirayama, Ryoji Kanno, Hajime Arai
ECS Meeting Abstracts 2020.11 The Electrochemical Society
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Operando Observation of Zinc Negative Electrode Using Confocal Optical System and X-Ray Diffraction
Atsunori Ikezawa, Masato Horiuchi, Hajime Arai
ECS Meeting Abstracts 2020.11
Awards
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2024年度電気化学会関東支部功労賞
2025.3 電気化学会関東支部
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2024.3
Research Projects
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Kinetic analysis of carbon corrosion reactions in alkaline electrolyte solutions using a newly developed DEMS system
Grant number：23K13819 2023.4 - 2025.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
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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) 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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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：23K23035 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 ）
アニオン欠損を酸化物に導入することは電気伝導性や磁性などの物性の変化をもたらし、またイオン伝導性や触媒活性といった様々な機能性の獲得をもたらす。アニオン欠損の研究は特にペロブスカイト酸化物ABO3 (A,Bは金属イオン)において盛んに行われている。本研究では、八面体を好む金属と四面体を好む金属を合理的に組み合わせることでアニオン欠損構造を持つペロブスカイト物質の合成と新規物質探索を行うことを目的とする。特に、これまで開拓があまり進んでいない、(111)p面欠損を持つペロブスカイトに特に注目して、新規物質の合成や物性開拓を進めている。
R5年度は、(111)p面欠損を持つ新規酸素欠損ペロブスカイト酸化物Ba6Ta2Na2X2O17 (X = P, V)をInorganic Chemstry誌に報告した。直前にNature誌（Szymanski et al. Nature 2023, 624, 86-91.）に報告された構造解析の誤りを正すもので、学術的に重要な結果であると考えている。また、酸素欠陥秩序を持つSr3Fe2O7-dの酸素放出挙動の反応過程の可視化の論文をAdv. Sci.誌に報告した。さらに超高圧フラックス法を用いた酸水素化物ペロブスカイトの合成の論文をJ. Am. Chem. Soc.誌に報告するなど、多くのアウトプットを行った。 -
Construction of reference electrodes and all-solid-state four-electrode cells for the investigation of lithium-ion transfers at solid|solid interfaces
Grant number：22H04608 2022.4 - 2024.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
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二次電池用亜鉛極の長寿命化を目的とした充放電反応速度論および電解液設計指針の構築
Grant number：21K14712 2021.4 - 2023.3
日本学術振興会 科学研究費助成事業 若手研究 若手研究
池澤 篤憲
Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）
亜鉛極は安価、高容量かつ比較的低電位で不燃性のアルカリ水溶液において作動可能なため、次世代の二次電池負極として期待されている。しかし、充放電を繰り返すことで電極形状変化、不動態化が生じ容量劣化が進行するため、長寿命化が喫緊の課題となっている。亜鉛極の充放電反応は電気化学反応である亜鉛の溶解析出反応(過程1)、電解液中の亜鉛酸イオンの輸送(過程2)、化学反応である酸化亜鉛の溶解析出反応 (過程3)の3つの過程で構成される。中間生成物である亜鉛酸イオンの輸送距離が長すぎると、過程1と過程3が異なる領域で進行して形状変化 が生じ、輸送距離が短すぎると、亜鉛上に緻密な酸化亜鉛の被膜が形成され不動態化が進行することが知られている。本研究では、亜鉛酸イオン輸送距離を支配する電極反応速度論を解析することで、長寿命化のための電解液設計指針を打ち出すことを目的とする。
本年度はX線回折測定と共焦点顕微鏡測定を組み合わせたその場測定系の構築を行い、亜鉛極充放電反応に与える電気化学過程（過程1）と化学過程（過程2,3）の反応速度比の影響を調べるために、種々の充放電レートにおける充放電試験を実施した。フルセルを用いた充放電試験の結果、極めて低レートで充放電を行った際に電極寿命が極端に短くなることが明らかとなった。構築したその場測定や解体試験（X線CT、走査電子顕微鏡測定）の結果、放電時の亜鉛溶解反応（過程1）が、電解液中の亜鉛酸イオンの輸送(過程2)に対して相対的に遅くなることで、電極近傍での亜鉛酸イオンの過飽和度が下がり、酸化亜鉛の析出反応 (過程3)が抑制され、電極内の活物質が枯渇して劣化につながることが明らかとなった。
本成果は2021年10月に開催された第11回CSJ化学フェスタで研究協力者の修士課程学生が発表し、優秀ポスター発表賞を受賞した。