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Materials Science

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Chemistry

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Overview

Hajime Arai is affiliated with the Tokyo Institute of Technology in Japan. Their research primarily focuses on the engineering field, with notable specialization in electrical and electronic engineering, automotive engineering, renewable energy, sustainability and the environment, materials chemistry, and electronic, optical, and magnetic materials.

The main topics covered in Arai's research include advancements in battery materials, advanced battery materials and technologies, advanced battery technologies research, electrocatalysts for energy conversion, fuel cells and related materials, and supercapacitor materials and fabrication.

Frequent collaborators in their work include Atsunori Ikezawa, Takeyoshi Okajima, Ryoji Kanno, Kota Suzuki, and Masaaki Hirayama.

Hajime Arai has contributed to a number of scientific publications, with a focus on journals and venues such as ECS Meeting Abstracts, Journal of Power Sources, Journal of Materials Chemistry A, ACS Applied Energy Materials, and Electrochemistry. The following recent papers illustrate the scope and focus of their work:

  • Performance of Li4Ti5O12-based reference electrode for the electrochemical analysis of all-solid-state lithium-ion batteries, 2020, Electrochemistry Communications
  • Bifunctional electrocatalysts of lanthanum-based perovskite oxide with Sb-doped SnO2 for oxygen reduction and evolution reactions, 2020, Journal of Power Sources
  • 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, 2021, Journal of Materials Chemistry A
  • Single-Crystal-like Durable LiNiO2 Positive Electrode Materials for Lithium-Ion Batteries, 2022, ACS Applied Materials & Interfaces
  • AC impedance analysis of NCM523 composite electrodes in all-solid-state three electrode cells and their degradation behavior, 2023, Journal of Power Sources

Best Publications

  • Characterization and cathode performance of Li1 − xNi1 + xO2 prepared with the excess lithium method

    H. Arai;S. Okada;H. Ohtsuka;M. Ichimura

  • Synthesis, redox potential evaluation and electrochemical characteristics of NASICON-related-3D framework compounds

    K. S. Nanjundaswamy;A. K. Padhi;John B Goodenough;S. Okada

  • Thermal behavior of Li1-yNiO2 and the decomposition mechanism

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Cathode performance and voltage estimation of metal trihalides

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Electrochemical and thermal behavior of LiNi1-zMzO2 (M = Co, Mn, Ti)

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • Direct observation of reversible oxygen anion redox reaction in Li-rich manganese oxide, Li2MnO3, studied by soft X-ray absorption spectroscopy

    Masatsugu Oishi;Keisuke Yamanaka;Iwao Watanabe;Iwao Watanabe;Keiji Shimoda

  • Direct Observation of a Metastable Crystal Phase of LixFePO4 under Electrochemical Phase Transition

    Yuki Orikasa;Takehiro Maeda;Yukinori Koyama;Haruno Murayama

  • Reversibility of LiNiO2 cathode

    Hajime Arai;Shigeto Okada;Yoji Sakurai;Jun Ichi Yamaki

  • First In Situ Observation of the LiCoO2 Electrode/Electrolyte Interface by Total‐Reflection X‐ray Absorption Spectroscopy

    Daiko Takamatsu;Yukinori Koyama;Yuki Orikasa;Shinichiro Mori

  • Charge compensation mechanisms in Li1.16Ni0.15Co0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure

    Masatsugu Oishi;Takahiro Fujimoto;Yu Takanashi;Yuki Orikasa

  • Ionic Conduction in Lithium Ion Battery Composite Electrode Governs Cross-sectional Reaction Distribution

    Yuki Orikasa;Yuma Gogyo;Hisao Yamashige;Misaki Katayama

  • Transient phase change in two phase reaction between LiFePO4 and FePO4 under battery operation

    Yuki Orikasa;Takehiro Maeda;Yukinori Koyama;Haruno Murayama

  • Defect Chemistry in Layered LiMO2 (M = Co, Ni, Mn, and Li1/3Mn2/3) by First-Principles Calculations

    Yukinori Koyama;Hajime Arai;Isao Tanaka;Yoshiharu Uchimoto

  • AC Impedance Analysis of Bifunctional Air Electrodes for Metal‐Air Batteries

    Hajime Arai;Stefan Müller;Otto Haas

  • Low temperature synthesis and electrochemical characteristics of LiFeO2 cathodes

    Yoji Sakurai;Hajime Arai;Shigeto Okada;Jun Ichi Yamaki

  • Real-time observations of lithium battery reactions—operando neutron diffraction analysis during practical operation

    Sou Taminato;Masao Yonemura;Shinya Shiotani;Takashi Kamiyama

  • Structural and electronic features of binary Li(2)S-P(2)S(5) glasses.

    Koji Ohara;Akio Mitsui;Akio Mitsui;Masahiro Mori;Yohei Onodera

  • Thermal Reactions Between Delithiated Lithium Nickelate and Electrolyte Solutions

    Unknown

  • Preparation of electrochemically active α-LiFeO2 at low temperature

    Yoji Sakurai;Hajime Arai;Jun-ichi Yamaki

  • Depth-resolved X-ray absorption spectroscopic study on nanoscale observation of the electrode–solid electrolyte interface for all solid state lithium ion batteries

    Toyoki Okumura;Takayuki Nakatsutsumi;Toshiaki Ina;Yuki Orikasa

  • Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion/Extraction Reactions

    Atsushi Sakuda;Koji Ohara;Katsutoshi Fukuda;Koji Nakanishi

  • Direct observation of layered-to-spinel phase transformation in Li2MnO3 and the spinel structure stabilised after the activation process

    Keiji Shimoda;Masatsugu Oishi;Toshiyuki Matsunaga;Miwa Murakami

Frequent Co-Authors

Yoshiharu Uchimoto
Yoshiharu Uchimoto Kyoto University
Zempachi Ogumi
Zempachi Ogumi Kyoto University
Yuki Orikasa
Yuki Orikasa Ritsumeikan University
Eiichiro Matsubara
Eiichiro Matsubara Kyoto University
Katsutoshi Fukuda
Katsutoshi Fukuda Kyoto University
Toshiaki Ohta
Toshiaki Ohta Ritsumeikan University
Ryoji Kanno
Ryoji Kanno Tokyo Institute of Technology
Isao Tanaka
Isao Tanaka Kyoto University
Masaaki Hirayama
Masaaki Hirayama Tokyo Institute of Technology
Shigeto Okada
Shigeto Okada Kyushu University

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