Akichika Kumatani | Researchain

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Featured researches published by Akichika Kumatani.

Japanese Journal of Applied Physics | 2014

Epitaxial growth of Li4Ti5O12 thin films using RF magnetron sputtering

Akichika Kumatani; Susumu Shiraki; Yoshitaka Takagi; Tohru Suzuki; Takeo Ohsawa; Xiang Gao; Yuichi Ikuhara; Taro Hitosugi

We fabricated Li4Ti5O12(111) epitaxial thin films on α-Al2O3(0001) substrates by RF magnetron sputtering. Thin films of amorphous Li4Ti5O12 were deposited at room temperature, and then the films were annealed at high temperatures for the formation of epitaxial thin films. Furthermore, we investigated the effect of niobium (Nb) incorporation into Li4Ti5O12. The Nb-incorporated Li4Ti5O12 thin films showed an improvement in crystallinity with a narrower rocking curve full width at half-maximum of 0.36° for the Li4Ti5O12(111) peak. Further, the resistivity of the Nb-incorporated film dropped three orders of magnitude on the Nb incorporation.

Journal of Power Sources | 2014

Fabrication of all-solid-state battery using epitaxial LiCoO2 thin films

Susumu Shiraki; Hideki Oki; Yoshitaka Takagi; Tohru Suzuki; Akichika Kumatani; Ryota Shimizu; Masakazu Haruta; Takeo Ohsawa; Yukio Sato; Yuichi Ikuhara; Taro Hitosugi

Acta Materialia | 2013

Antiphase inversion domains in lithium cobaltite thin films deposited on single-crystal sapphire substrates

Shijian Zheng; Craig A. J. Fisher; Taro Hitosugi; Akichika Kumatani; Susumu Shiraki; Yumi H. Ikuhara; Akihide Kuwabara; Hiroki Moriwake; Hideki Oki; Yuichi Ikuhara

Electrochemistry | 2014

Nanoscale Cell Surface Topography Imaging using Scanning Ion Conductance Microscopy

Yasufumi Takahashi; Komachi Ito; Xiongwei Wang; Yoshiharu Matsumae; Hirokazu Komaki; Akichika Kumatani; Kosuke Ino; Hitoshi Shiku; Tomokazu Matsue

Solid State Ionics | 2016

Preparation and in-situ characterization of well-defined solid electrolyte/electrode interfaces in thin-film lithium batteries

Masakazu Haruta; Susumu Shiraki; Takeo Ohsawa; Tohru Suzuki; Akichika Kumatani; Yoshitaka Takagi; Ryota Shimizu; Taro Hitosugi

Physical Chemistry Chemical Physics | 2017

3D electrochemical and ion current imaging using scanning electrochemical–scanning ion conductance microscopy

Yasufumi Takahashi; Hiroki Ida; Yoshiharu Matsumae; Hirokazu Komaki; Yuanshu Zhou; Akichika Kumatani; Makoto Kanzaki; Hitoshi Shiku; Tomokazu Matsue

Surface and Interface Analysis | 2018

Scanning electrochemical cell microscopy for visualization and local electrochemical activities of lithium-ion (de) intercalation process in lithium-ion batteries electrodes

Akichika Kumatani; Yasufumi Takahashi; Chiho Miura; Hiroki Ida; Hirotaka Inomata; Hitoshi Shiku; Hirokazu Munakata; Kiyoshi Kanamura; Tomokazu Matsue

Electrochimica Acta | 2017

Nanosheet-structured NiCoO2/carbon nanotubes hybrid composite as a novel bifunctional oxygen electrocatalyst

Li Ma; Han Zhou; Yao Sun; Shuli Xin; Chunhui Xiao; Akichika Kumatani; Tomokazu Matsue; Penghui Zhang; Shujiang Ding; Fei Li

PRiME 2016/230th ECS Meeting (October 2-7, 2016) | 2016

Localized Electrochemical Analysis of Polyacrylate Binders on Graphite-Silicon Negative Electrodes in Lithium-Ion Batteries

Akichika Kumatani; Tetsuya Watanabe; Takahashi Yasufumi; Kei Kubota; Hiroki Ida; Hitoshi Shiku; Shinichi Komaba; Tomokazu Matsue

228th ECS Meeting (October 11-15, 2015) | 2015

Current Response at Grain and Grain Boundaries in LiFePO 4 Thin Films By Nano-Scanning Electrochemical Cell Microscopy

Akichika Kumatani; Yasufumi Takahashi; Hirotaka Inomata; Tetsuya Watanabe; Kuniko Yamamoto; Masakazu Haruta; Susumu Shiraki; Hitoshi Shiku; Taro Hitosugi; Tomokazu Matsue

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