Researcher Information

NASU Akira

Assistant Professor

Development of novel materials using nonequilibrium and metastable state

Department of Chemistry, Inorganic and Analytical Chemistry

basic_photo_1
Theme

・Novel materials for sodium secondary battery
・Analysis of reactions at heterointerface formed in batteries

FieldInorganic materials chemistry, Electrochemistry, Solid state chemistry
KeywordSodium secondary battery, Solid electrolyte, Sulfide materials, Metastable phase, Nonequilibrium state, Glass materials

Introduction of Research

Energy storage devices play the important role for achievement of sustainable development goals. The universal materials with ubiquitous elements are desired for more diverse applications. “Specific” crystal and electronic structure enhance their properties. Therefore, we must pioneer new frontiers of materials with rich elements, such as Na, K, Fe, and Mn, in metastable phase and nonequilibrium phase by examining starting materials, reaction pathway and synthesis process. In addition, we will also reveal the phenomena with their electrochemically and thermodynamically complex mechanisms at hetero-interface in batteries. The analysis leads to the new strategy for development of novel candidate materials.

study-image-0
Iron sulfide active materials Na2FeS2 with a novel host structure exhibiting high capacity and reversibility
study-image-1
Various metastable phases of Na2TiS3 produced by solid phase process and mechanochemical process

Representative Achievements

Iron Sulfide Na2FeS2 as Positive Electrode Material with High Capacity and Reversibility Derived from Anion–Cation Redox in All-Solid-State Sodium Batteries,
A. Nasu, A. Sakuda, T. Kimura, M. Deguchi, A. Tsuchimoto, M. Okubo, A. Yamada, M. Tatsumisago, and A. Hayashi, Small, 2022, 2203383.
Formation of Passivate Interphases by Na3BS3‑Glass Solid Electrolytes in All-Solid-State Sodium-Metal Batteries,
A. Nasu, T. Inaoka, F. Tsuji, K. Motohashi, A. Sakuda, M. Tatsumisago, and A. Hayashi, ACS Appl. Mater. Interfaces, 2022, 14, 24480-24485.
Mechanochemical synthesis of cubic rocksalt Na2TiS3 as novel active materials for all-solid-state sodium secondary batteries,
A. Nasu, M. Otoyama, A. Sakuda, A. Hayashi and M. Tatsumisago, J. Ceram. Soc. Jpn., 2019, 127, 514-517.
Amorphous Na2TiS3 as an Active Material for All-solid-state Sodium Batteries,
A. Nasu, M. Otoyama, A. Sakuda, A. Hayashi and M. Tatsumisago, Chem. Lett., 2019, 48, 288-290.
Mechanochemical synthesis of Na3NbS4 metastable phase as positive electrode materials for all-solid-state sodium batteries,
A. Nasu, A. Sakuda, A. Hayashi and M. Tatsumisago, J. Ceram. Soc. Jpn., 2022, 130, 789-793.

Related industries

Chemical industry, Electrical industry, Energy industry, Glass industry, Ceramics industry
Academic degreePh. D.
Self Introduction

I am from Sennan-city in South Osaka. My hobbies are reading books, stargazing, walking and taking a picture. The exciting moments with changing my sense of values by new ideas and concepts promoted me to this wonderful science world. Let's enjoy our science life.

Academic background2018 B. Sc., School of materials, Chemistry and Chemical Engineering, College of Engineering, Osaka Prefecture University
2020 M. Sc., Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
2022 Ph. D., Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
2022 Assistant Professor, Department of Chemistry, Hokkaido University
Affiliated academic societyThe Electrochemical Society Japan, The Ceramic Society of Japan, The Solid State Ionics Society of Japan, The Chemical Society of Japan
Room addressScience Building 6, Room 6-4-06
basic_photo_1

Belongs

Related Research News