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Your search keyword '"Sakuda, Atsushi"' showing total 215 results
Start Over Author "Sakuda, Atsushi" Publication Type Academic Journals
215 results on '"Sakuda, Atsushi"'

21. Aqueous solution synthesis of lithium-ion conductive tin-based sulphide electrolytes.

Author

Kimura, Takuya, Tanigaki, Hayata, Sakuda, Atsushi, Tatsumisago, Masahiro, and Hayashi, Akitoshi

Subjects
SOLID electrolytes, IONIC conductivity, AQUEOUS solutions, HUMAN ecology, ORGANIC solvents, SUPERIONIC conductors
Abstract

To overcome the challenges associated with the toxicity of the majority of organic solvents for the liquid phase synthesis of solid electrolytes toward the human body and environment, we demonstrate the synthesis of tin-based sulphide electrolytes using water, which is the most environmentally friendly solvent. ortho-Thiostannate, i.e., Li4SnS4, was obtained from a mixture of Li2S, Sn, and S using aqueous solution synthesis. Furthermore, Li10SnP2S12, a superionic conductor, was obtained by mixing an aqueous solution of Li4SnS4 and tetrahydrofuran suspension of Li3PS4, which exhibited the highest ionic conductivity (5.9 × 10−3 S cm−1 at 25 °C) in liquid-phase synthesis. This study successfully demonstrates that water can be efficiently used to synthesize sulphide electrolytes instead of conventional organic solvents. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Lithium Ion Transport Environment by Molecular Vibrations in Ion‐Conducting Glasses.

Author

Yamada, Hiroki, Ohara, Koji, Hiroi, Satoshi, Sakuda, Atsushi, Ikeda, Kazutaka, Ohkubo, Takahiro, Nakada, Kengo, Tsukasaki, Hirofumi, Nakajima, Hiroshi, Temleitner, Laszlo, Pusztai, Laszlo, Ariga, Shunsuke, Matsuo, Aoto, Ding, Jiong, Nakano, Takumi, Kimura, Takuya, Kobayashi, Ryo, Usuki, Takeshi, Tahara, Shuta, and Amezawa, Koji

Subjects
MOLECULAR vibration, ION transport (Biology), LITHIUM ions, MONTE Carlo method, SOLID electrolytes, EDUCATIONAL mobility
Abstract

Controlling Li ion transport in glasses at atomic and molecular levels is key to realizing all‐solid‐state batteries, a promising technology for electric vehicles. In this context, Li3PS4 glass, a promising solid electrolyte candidate, exhibits dynamic coupling between the Li+ cation mobility and the PS43− anion libration, which is commonly referred to as the paddlewheel effect. In addition, it exhibits a concerted cation diffusion effect (i.e., a cation–cation interaction), which is regarded as the essence of high Li ion transport. However, the correlation between the Li+ ions within the glass structure can only be vaguely determined, due to the limited experimental information that can be obtained. Here, this study reports that the Li ions present in glasses can be classified by evaluating their valence oscillations via Bader analysis to topologically analyze the chemical bonds. It is found that three types of Li ions are present in Li3PS4 glass, and that the more mobile Li ions (i.e., the Li3‐type ions) exhibit a characteristic correlation at relatively long distances of 4.0–5.0 Å. Furthermore, reverse Monte Carlo simulations combined with deep learning potentials that reproduce X‐ray, neutron, and electron diffraction pair distribution functions showed an increase in the number of Li3‐type ions for partially crystallized glass structures with improved Li ion transport properties. Our results show order within the disorder of the Li ion distribution in the glass by a topological analysis of their valences. Thus, considering the molecular vibrations in the glass during the evaluation of the Li ion valences is expected to lead to the development of new solid electrolytes. [ABSTRACT FROM AUTHOR]

Published
2024
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44. An Electron/Ion Dual Conductive Integrated Cathode Using Cationic/Anionic Redox for High‐Energy‐Density All‐Solid‐State Lithium‐Sulfur Batteries.

Author

Pan, Wenli, Yamamoto, Kentaro, Matsunaga, Toshiyuki, Watanabe, Toshiki, Kumar, Mukesh, Thakur, Neha, Uchiyama, Tomoki, Uesugi, Masayuki, Takeuchi, Akihisa, Sakuda, Atsushi, Hayashi, Akitoshi, Tatsumisago, Masahiro, and Uchimoto, Yoshiharu

Subjects
LITHIUM sulfur batteries, SOLID state batteries, COMPUTED tomography, CATHODES, DISTRIBUTION (Probability theory), ENERGY density, SOLID electrolytes
Abstract

All‐solid‐state lithium‐sulfur batteries (ASSLSB), composed of sulfur cathode and lithium metal anode with high theoretical capacity, have a potentially higher energy density by weight than a typical lithium‐ion battery (LIB). However, due to insulating sulfur, a relatively large proportion of electronic (carbon) and ionic (solid electrolyte) conductors are mixed for cathode fabrication, leading to inferior practical capacity. Herein, we report a novel integrated cathode Li2S‐LiI‐MoS2 which has relatively high electronic and ionic conductivities (the order of 10−4 S cm−1) without any carbon and solid electrolyte. The ASSLSB with integrated Li2S‐LiI‐MoS2 cathode delivers a remarkably high energy density of 1020 Wh kg−1 at the cathode level at room temperature. By applying precise X‐ray diffraction, pair distribution function analysis and X‐ray computed tomography, it is found that the formation of an ionic conducting phase composed mainly of LiI during discharge is responsible for the high rate capability. Furthermore, X‐ray absorption fine structure (XAFS) has also revealed the charge compensation mechanism and ascertained the involvement of both Mo 3d and S 3p orbitals during the charging and discharging process. It is believed the strategy will pave the way for developing high practical energy density at room temperature for all‐solid‐state batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Improving the electrochemical performance of Li2S cathodes based on point defect control with cation/anion dual doping.

Author

Pan, Wenli, Yamamoto, Kentaro, Machida, Nobuya, Matsunaga, Toshiyuki, Kumar, Mukesh, Thakur, Neha, Watanabe, Toshiki, Sakuda, Atsushi, Hayashi, Akitoshi, Tatsumisago, Masahiro, and Uchimoto, Yoshiharu

Abstract

Li2S is a promising cathode candidate for all-solid-state batteries (ASSBs) because of its high theoretical capacity and availability for coupling with a Li-free anode or an anode-less electrode. However, ionically insulating Li2S leads to excess conductive additives, low sulfur utilization and sluggish kinetics, which hinders the implementation of high energy density potential by ASSBs. Improving the intrinsic conductivity of Li2S is the key to solve this issue. In this study, PI3-doped Li2S cathodes were fabricated and the relationship between lithium vacancies and ionic conductivities was examined quantitatively by the time-of-flight (TOF) neutron diffraction. By cation–anion dual doping, the ionic conductivities of Li2S–PI3 materials were improved to 10−4 S cm−1, which is desirable for the cathode without solid electrolytes added. Upon simply mixing with carbon, the Li2S–PI3–C cathode shows a high overall cathode capacity of 541 mA h g−1 with a high S utilization of 82% at 0.05C and a capacity of 207 mA h g−1 at 1C at room temperature, realizing high energy density with good rate performance. [ABSTRACT FROM AUTHOR]

Published
2023
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