K
Kazuyasu Tokiwa
Researcher at Tokyo University of Science
Publications - 115
Citations - 1906
Kazuyasu Tokiwa is an academic researcher from Tokyo University of Science. The author has contributed to research in topics: Superconductivity & Cuprate. The author has an hindex of 17, co-authored 115 publications receiving 1675 citations. Previous affiliations of Kazuyasu Tokiwa include National Institute of Advanced Industrial Science and Technology.
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Journal ArticleDOI
Negative electrodes for Na-ion batteries.
Mouad Dahbi,Mouad Dahbi,Naoaki Yabuuchi,Naoaki Yabuuchi,Kei Kubota,Kei Kubota,Kazuyasu Tokiwa,Shinichi Komaba,Shinichi Komaba +8 more
TL;DR: The prospect of Na-ion batteries as low-cost and long-life batteries with relatively high-energy density as their potential competitive edge over the commercialized Li-ion rechargeable batteries is addressed.
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Black Phosphorus as a High-Capacity, High-Capability Negative Electrode for Sodium-Ion Batteries: Investigation of the Electrode/Electrolyte Interface
Mouad Dahbi,Mouad Dahbi,Naoaki Yabuuchi,Naoaki Yabuuchi,Mika Fukunishi,Kei Kubota,Kei Kubota,Kuniko Chihara,Kazuyasu Tokiwa,Xue Fang Yu,Xue Fang Yu,Hiroshi Ushiyama,Hiroshi Ushiyama,Koichi Yamashita,Koichi Yamashita,Jin Young Son,Yi-Tao Cui,Hiroshi Oji,Shinichi Komaba,Shinichi Komaba +19 more
TL;DR: In this article, surface characterization techniques are combined for investigation on the electrode/electrolyte interface of the black phosphorus electrodes with polyacrylate binder to understand the formation of a solid electrolyte interphase (SEI) in alkyl carbonate ester and its evolution during cycling.
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Single-crystal synthesis, structure refinement and electrical properties of Li0.5CoO2
TL;DR: In this paper, a single-crystal x-ray diffraction study revealed an ordered superstructure with monoclinic symmetry, that could be assigned to the space group P 2/m.
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Tc vs n Relationship for Multilayered High-Tc Superconductors
Akira Iyo,Yasumoto Tanaka,Hijiri Kito,Y. Kodama,Parasharam M. Shirage,D. D. Shivagan,Hirofumi Matsuhata,Kazuyasu Tokiwa,Tsuneo Watanabe +8 more
TL;DR: In this article, the authors proposed a T c vs n relationship for multilayered high-T c superconductors from the analysis of HgBa 2 Ca n -1 Cu n O y grain-aligned samples containing n =6 to 16 phases.
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Interpretation of Abnormal AC Loss Peak Based on Vortex-Molecule Model for a Multicomponent Cuprate Superconductor
TL;DR: In this paper, an abnormal loss peak was found in the multilayer cuprate supercondutor CuxBa2Ca2Cu3Oy (Cu-1223), where two components couple with each other through the intercomponent Josephson interaction.