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Your search keyword '"Sakuda, Atsushi"' showing total 92 results
Start Over Author "Sakuda, Atsushi" Publisher elsevier b.v.
92 results on '"Sakuda, Atsushi"'

46. Preparation and ionic conductivities of (100 - x)(0.75Li2S.0.25P2S5).xLiBH4 glass electrolytes.

Author

Yamauchi, Akihiro, Sakuda, Atsushi, Hayashi, Akitoshi, and Tatsumisago, Masahiro

Subjects
*IONIC conductivity, *METALLIC glasses, *ELECTROLYTES, *LITHIUM-ion batteries, *LITHIUM alloys, *MECHANICAL alloying, *CRYSTAL structure
Abstract

(100 − x)(0.75Li2S·0.25P2S5)·xLiBH4 (0 ≤ x (mol%) ≤ 33) glass electrolytes were prepared from 75Li2S·25P2S5 (mol%) glass and LiBH4 crystal by a mechanical milling technique. The effects of the addition of LiBH4 on the structures and properties of the glass electrolytes were examined. The DSC curves of the prepared glasses with LiBH4 did not have the endothermic peak attributable to the phase transition of LiBH4 crystal. The Raman spectra of the glasses indicated that the glasses included PS4 3− and BH4 − ions. The conductivities of the glasses increased with increasing the LiBH4 content. The glass at the composition of x = 33 showed the highest lithium-ion conductivity of 1.6 × 10−3 S cm−1 at room temperature. The glass had a wide electrochemical window up to 5 V vs. Li+/Li. An all-solid-state Li/TiS2 cell using the glass as an electrolyte successfully operated as a secondary battery at 25 °C. [ABSTRACT FROM AUTHOR]

Published
2013
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47. Amorphous TiS4 positive electrode for lithium–sulfur secondary batteries.

Author

Sakuda, Atsushi, Taguchi, Noboru, Takeuchi, Tomonari, Kobayashi, Hironori, Sakaebe, Hikari, Tatsumi, Kuniaki, and Ogumi, Zempachi

Subjects
*AMORPHOUS substances, *ELECTRODES, *LITHIUM sulfur batteries, *COMPOSITE materials, *CARBON-black, *TITANIUM, *POLYSULFIDES
Abstract

Abstract: Composite electrodes based on amorphous titanium polysulfide and acetylene black were mechanically prepared, and their performance was investigated. The amorphous TiS4 and acetylene black composites were discharged and charged with a high reversible capacity of 563mAhg−1 in the 1.9–3.0 voltage range. The Coulombic efficiency of the composite was higher than that of a sulfur electrode because the dissolution of the polysulfide into electrolytes was suppressed. Amorphization and dispersion of carbon inside the particles were effective in improving the performance of the titanium polysulfide electrodes. [Copyright &y& Elsevier]

Published
2013
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48. Preparation of Li2S–GeS2 solid electrolyte thin films using pulsed laser deposition

Author

Ito, Yusuke, Sakuda, Atsushi, Ohtomo, Takamasa, Hayashi, Akitoshi, and Tatsumisago, Masahiro

Subjects
*ELECTRIC properties of thin films, *SOLID electrolytes, *PULSED laser deposition, *LITHIUM compounds, *AMORPHOUS substances, *IONIC conductivity
Abstract

Abstract: Amorphous Li2S–GeS2 solid electrolyte thin films were prepared using pulsed laser deposition (PLD) at the compositions of 67–83mol% Li2S. The ionic conductivities at room temperature increased with increasing Li2S contents and attained a maximum value of 1.8×10−4 Scm−1 at the composition of 78mol% Li2S. The obtained solid electrolyte thin film was applied to form an ideal electrode–electrolyte interface in all-solid-state batteries. The all-solid-state lithium cell using LiCoO2 coated with the solid electrolyte thin film operated as a lithium secondary battery at room temperature. [Copyright &y& Elsevier]

Published
2013
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49. All-solid-state lithium secondary batteries using LiCoO2 particles with pulsed laser deposition coatings of Li2S–P2S5 solid electrolytes

Author

Sakuda, Atsushi, Hayashi, Akitoshi, Ohtomo, Takamasa, Hama, Shigenori, and Tatsumisago, Masahiro

Subjects
*LITHIUM-ion batteries, *SOLID state batteries, *PULSED laser deposition, *SURFACE coatings, *SOLID electrolytes, *SULFIDES, *ELECTRIC properties of thin films, *COMPOSITE materials
Abstract

Abstract: Electrode–electrolyte composite materials were prepared by coating a highly conductive Li2S–P2S5 solid electrolyte onto LiCoO2 electrode particles using pulsed laser deposition (PLD). Cross-sections of the composite electrode layers of the all-solid-state cells were observed using a transmission electron microscope to investigate the packing morphology of the LiCoO2 particles and the distribution of solid electrolyte in the composite electrode. All-solid-state cells based on a composite electrode composed entirely of solid-electrolyte-coated LiCoO2 were fabricated, and their performance was investigated. The coating amounts of Li2S–P2S5 solid electrolytes on LiCoO2 particles and the conductivity of the coating material were controlled to increase the capacity of the resulting all-solid-state cells. All-solid-state cells using LiCoO2 with thick solid electrolyte coatings, grown over 120min, had a capacity of 65mAhg−1, without any addition of Li2S–P2S5 solid electrolyte particles to the composite electrode. The capacity of the all-solid-state cell increased further after increasing the conductivity of the Li2S–P2S5 solid electrolyte coating by heat treatment at 200°C. Furthermore, an all-solid-state cell based on a composite electrode using both a solid electrolyte coating and added solid electrolyte particles was fabricated, and the capacity of the resulting all-solid-state cell increased to 95mAhg−1. [Copyright &y& Elsevier]

Published
2011
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50. Preparation of amorphous Li4SiO4–Li3PO4 thin films by pulsed laser deposition for all-solid-state lithium secondary batteries

Author

Sakurai, Yuki, Sakuda, Atsushi, Hayashi, Akitoshi, and Tatsumisago, Masahiro

Subjects
*AMORPHOUS substances, *THIN films, *PULSED laser deposition, *SOLID state chemistry, *LITHIUM ions, *STORAGE batteries
Abstract

Abstract: Amorphous thin film electrolytes in the system Li4SiO4–Li3PO4 were prepared by pulsed laser deposition (PLD). The ionic conductivity of the amorphous film at the composition 50Li4SiO4·50Li3PO4 (mol%) was 1.6×10−6 Scm−1 at room temperature which is higher than the conductivities of Li3PO4 and Li4SiO4 films. The 50Li4SiO4·50Li3PO4 film was coated on LiCoO2 active material particles by PLD. All-solid-state lithium secondary batteries using the coated LiCoO2 electrode and the Li2S–P2S5 solid electrolyte were fabricated. The PLD coating of oxide film with high conductivity on LiCoO2 was effective in decreasing the electrode/electrolyte interfacial resistance and developing power density of the all-solid-state cells. [Copyright &y& Elsevier]

Published
2011
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