Journal Paper

• Rui Liu, Atsunori Ikezawa, Moritz Borkenhagen, Takeyoshi Okajima, Daniel Schröder, Hajime Arai. Highly active LMO/Ni(Fe)-LDH bifunctional gas-diffusion electrode with bilayer design, Journal of Power Sources, Vol. 652, June 2025.  Official location  
• Kota Nakahara, Atsunori Ikezawa, Junichi Inamoto, Takeyoshi Okajima, Hajime Arai. How Do Pore Sizes Affect the Oxygen Reduction Reaction Kinetics of Platinum Electrodes?, Journal of Materials Chemistry A, Vol. 13, pp. 18338 - 18347, Apr. 2025.  Official location  

International Conference (Reviewed)

• Tenshin Kobayashi, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. Oxygen Evolution Reaction Activity of NiFe-LDH with High Crystallinity and Specific Surface Area, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Sota Inoue, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Operando Confocal Microscopy and Simulation Analysis of Ion Transport in Graphite Electrode toward Reduced Resistance in All-Solid-State Batteries, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Ryo Ishikawa, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Short-Term Diagnosis of LIBs Degraded by Float Charging with Periodic Discharging, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Zhang Huijie, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. Enhancing Proton Battery Efficiency Through Electrode and Electrolyte Optimization, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Takeru Kuroda, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Synthesis and Evaluation of Hydrous Nickel Oxyhydroxide Electrodes by Soft Chemical Method, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, Takeyoshi Okajima, Hajime Arai. Elucidation of Charge and Discharge Mechanism of Modified Layered Hydrated Manganese Dioxide Positive Electrode Using Operando Measurements, 248th ECS Meeting, Oct. 2025.
• Yusuke Suzuki, Haruki Kaneda, Yuki Furuichi, Hiromasa Toya, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. A Comparative Investigation of Single- and Poly-Crystalline Positive Electrode Particles in All-Solid-State Batteries Using Three-Electrode Cells, 248th ECS Meeting, Oct. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, Takeyoshi Okajima, Hajime Arai. Analysis of charge-discharge mechanism of layered hydrated manganese dioxide positive electrode in alkaline electrolyte, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Kotaro Yoshida, Takeyoshi Okajima, Hajime Arai, Atsunori Ikezawa, Janis. K. Eckhardt, Sascha Kremer, Felix Schug, René Rekers Leonardo Merola, Jürgen Janek. Investigation of the Current Constriction Effect at the Interfaces between Sulfide Solid Electrolytes, 76th Annual Meeting of the International Society of Electrochemistry, Sept. 2025.
• Atsunori Ikezawa, Shinji Koito, Kota Nakahara, Junichi Inamoto, Takeyoshi Okajima, Hajime Arai. Development of Oxygen Electrocatalysts for Zinc-Air Secondary Batteries Using Model Electrodes, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Nanako Nonaka, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Local potential Indicators for Bifunctional Air Electrodes, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Liu Rui, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Bifunctional LMO/Ni(Fe)-LDH gas-diffusion electrode with bilayer design for rechargeable zinc–air battery, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.

Domestic Conference (Reviewed)

• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. アルカリ二次電池用充電開始型マンガン電極の開発, 第66回電池討論会, Nov. 2025.
• Yusuke Suzuki, Haruki Kaneda, Yuki Furuichi, TAKEYOSHI OKAJIMA, Atsunori Ikezawa, Hajime Arai. 全固体三極式セルを用いた単結晶・多結晶状正極活物質粒子の電気化学特性, 第66回電池討論会, Nov. 2025.
• 堀江 航, 池澤 篤憲, 岡島 武義, 荒井 創. その場観察を用いた金属亜鉛合剤電極の劣化挙動解析, 第15回 CSJ化学フェスタ2025, Oct. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. アルカリマンガン電池正極の充放電メカニズム評価, 第43回 夏の学校 電気化学会関東支部, Sept. 2025.
• TAKEYOSHI OKAJIMA, Atsunori Ikezawa, Hiroshi Ito, Naoya Ishida, Jun Shiroma, Koji Kawamoto, Hajime Arai. 硫化物系全固体電池における電極材料評価用対極の開発, 2025電気化学会秋季大会, Sept. 2025.
• Kotaro Yoshida, Takeyoshi Okajima, Hajime Arai, Atsunori Ikezawa, Janis. K. Eckhardt, Sascha Kremer, Felix Schug, René Rekers Leonardo Merola, Jürgen Janek. Investigation of the Current Constriction Effect at the Interfaces between Sulfide Solid Electrolytes, 第19回 固体イオニクスセミナー, Aug. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. Operando Mn–およびBi–XAFSによる水和二酸化マンガン正極の充放電メカニズム解析, 電気化学会第92回大会, Mar. 2025.
• Nanako Nonaka, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. Cu, Ag, Niを電位指示物質に用いた二機能性空気極内局所状態の光学観察, 電気化学会第92回大会, Mar. 2025.

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