Faculty Profiles - SAITOH, Koh

Papers - SAITOH, Koh

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HAADF-STEM observation of unique quasicrystalline precipitates from solid solution in Mg-Cd-Yb system

Ohhashi Satoshi, Saitoh Koh, Kato Akira, Tsai An-Pang

MATERIALS CHARACTERIZATION Vol. 172 2021.2

Denoising of series electron holograms using tensor decomposition Invited Reviewed

Yuki Nomura, Kazuo Yamamoto, Satoshi Anada, Tsukasa Hirayama, Emiko Igaki, Koh Saitoh

Microscopy 2020.9

Development of a voltage-applicable heating specimen holder for in situ observations of solid oxide fuel cells with an environmental transmission electron microscope

Ishida Takafumi, Hiroshima Hideto, Higuchi Kimitaka, Tomita Masahiro, Saitoh Koh, Tanji Takayoshi

SURFACE AND INTERFACE ANALYSIS Vol. 52 ( 9 ) page： 584 - 590 2020.9

Operando STEM-EELS of an All-solid-state Li-ion Battery Using a Multi-variate Analysis Reviewed

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

KENBIKYO Vol. 55 ( 2 ) page： 70 - 74 2020.8

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Microscopy

All-solid-state lithium-ion batteries (LIBs) are promising candidates of next-generation secondary batteries that have the potential to overcome the problems of conventional LIBs with liquid-electrolytes. However, it is known that the Li-ion conduction resistance at the electrode/solid-electrolyte interface limits their performance. It is important to elucidate interfacial phenomena at the nanometer scale and feed it back to material design. In this paper, we use scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) to dynamically observe the distribution of Li and the electronic state of transition metals in an all-solid-state LIB during the charge-discharge reactions. The distribution of Li was quantitatively observed under dynamic conditions by applying multivariate analysis. The results showed that Li ions were heterogeneously extracted/inserted during the charge/discharge reaction, and that the activity of the electrochemical reaction depended on the Li-ion concentration at the original state (as deposition). The origin of the interfacial resistance was the electrochemically inactive Co3O4 formed at 10–20 nm near the interface.

DOI： 10.11410/kenbikyo.55.2_70

CiNii Research

Visualization of Lithium Transfer Resistance in Secondary Particle Cathodes of Bulk-Type Solid-State Batteries

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

ACS ENERGY LETTERS Vol. 5 ( 6 ) page： 2098 - 2105 2020.6

Dynamic imaging of lithium in solid-state batteries by operando electron energy-loss spectroscopy with sparse coding

Nomura Yuki, Yamamoto Kazuo, Fujii Mikiya, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

NATURE COMMUNICATIONS Vol. 11 ( 1 ) 2020.6

Atom displacement detection of perovskite oxide in high resolution HAADF-STEM images by dictionary learning

Hattori Sosuke, Nomura Yuki, Saitoh Koh

Meeting Abstracts of the Physical Society of Japan Vol. 75.1 ( 0 ) page： 2279 - 2279 2020

Efficient Measurement of the Orbital-Angular-Momentum Spectrum of an Electron Beam via a Dammann Vortex Grating

Noguchi Yuuki, Nakayama Shota, Ishida Takafumi, Saitoh Koh, Uchida Masaya

PHYSICAL REVIEW APPLIED Vol. 12 ( 6 ) 2019.12

Smectic Liquid-Crystalline Structure of Skyrmions in Chiral Magnet Co8.5Zn7.5Mn4(110) Thin Film

Nagase T., Komatsu M., So Y. G., Ishida T., Yoshida H., Kawaguchi Y., Tanaka Y., Saitoh K., Ikarashi N., Kuwahara M., Nagao M.

PHYSICAL REVIEW LETTERS Vol. 123 ( 13 ) 2019.9

Creating electron phase holograms using femtosecond laser interference processing

Uesugi Yuuki, Fukushima Ryota, Saitoh Koh, Sato Shunichi

OPTICS EXPRESS Vol. 27 ( 15 ) page： 20958 - 20964 2019.7

Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

Uesugi Yuuki, Fukushima Ryota, Sato Shunichi, Saitoh Koh

Conference on Lasers and Electro-Optics:Science and Innovations 2019 page： SF1E.5. 2019.5

Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

Uesugi Y., Fukushima R., Sato S., Saitoh K.

2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings

Electron phase hologram was fabricated by a single-shot femtosecond laser interference processing. The generation of electron vortices from the fabricated hologram was demonstrated with higher diffraction efficiency than that of amplitude hologram as expected.

DOI： 10.23919/CLEO.2019.8750423

Scopus

Direct Observation of a Li-ionic Space-Charge Layer Formed at an Electrode/Solid-Electrolyte Interface

Y. Nomura, K.Yamamoto, T. Hirayama, S. Ouchi, E. Igaki, K. Saitoh

Angewandte Chemie Vol. 58 ( 16 ) page： 5292 - 5296 2019.4

Quantitative Operando Visualization of Electrochemical Reactions and Li Ions in All-Solid-State Batteries by STEM-EELS with Hyperspectral Image Analyses

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Ohkawa Mayumi, Igaki Emiko, Hojo Nobuhiko, Saitoh Koh

NANO LETTERS Vol. 18 ( 9 ) page： 5892-5898 2018.9

Electric shielding films for biased TEM samples and their application to in situ electron holography

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Saitoh Koh

MICROSCOPY Vol. 67 ( 3 ) page： 178-186 2018.6

Coherent pulse beam in spin-polarized TEM using an NEA photocathode

Kuwahara M., Ujihara T., Saitoh K., Tanaka N.

2018 31ST INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC) page： . 2018

Observation of localized surface plasmon of gold octahedral nanoparticles using STEM-EELS

Mizuno Rira

Meeting Abstracts of the Physical Society of Japan Vol. 73.1 ( 0 ) page： 2499 - 2499 2018

Nearly nondiffracting electron lattice beams generated by polygonal slits

H. Nambu, Y. Noguchi, K. Saitoh, M. Uchida

Microscopy Vol. 66 ( 4 ) page： 295 - 299 2017.8

Language：English Publishing type：Research paper (scientific journal)

A method for generating electron lattice beams carrying vortices using nanofabricated polygonal slits in a transmission electron microscope is proposed. Experimental and simulation study of the intensity of the beams verified their Bessel beam-like nearly non- diffracting behavior. Phase analysis using a diffractive imaging method found arrays of quantized vortices, forming an electron beam lattice with cylindrical intensity distribu- tion in the propagation direction. Such vortex lattice beams may be used in a variety of applications including nanofabrication, particle manipulation or a new electron imaging method.

DOI： 10.1093/jmicro/dfx020

Web of Science

Introduction to Electron Phase Imaging

Saitoh Koh

KENBIKYO Vol. 52 ( 1 ) page： 3 2017.4

The Boersch effect in a picosecond pulsed electron beam emitted from a semiconductor photocathode Reviewed

M. Kuwahara, Y. Nambo, K. Aoki, K. Sameshima, X. Jin, T. Ujihara, H. Asano, K. Saitoh, Y. Takeda, and N. Tanaka

Applied Physics Letters Vol. 109 page： 013108 2016

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Papers - SAITOH, Koh