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Akitoshi Hayashi,Masahiro Tatsumisago 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.2
The recent development of bulk-type solid-state rechargeable lithium batteries with sulfide glass-ceramics as a solid electrolyte was reviewed. Sulfide glasses and glass-ceramics in the system Li2S-P2S5 have an advantage of high conductivity, wide electrochemical window and low grain-boundary resistance. Bulk-type solid-state batteries composed of compressed powder layers of electrode and electrolyte were fabricated with Li2S-P2S5glass-ceramic electrolytes. Formation of a favorable solid-solid interface between electrode and electrolyte is a key to achieving excellent performance in solid-state batteries. The mechanochemical preparation of nano-composite electrodes and surface modification of active materials by softening of the electrolyte, or PLD coating, were useful for increasing the electrode-electrolyte contact area and improving battery performance.
Hydroxide ion Conduction Mechanism in Mg-Al CO<sub>3</sub><sup>2-</sup> Layered Double Hydroxide
Kubo, Daiju,Tadanaga, Kiyoharu,Hayashi, Akitoshi,Tatsumisago, Masahiro The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
Ionic conduction mechanism of Mg-Al layered double hydroxides (LDHs) intercalated with CO<sub>3</sub><sup>2-</sup> (Mg-Al CO<sub>3</sub><sup>2-</sup> LDH) was studied. The electromotive force for the water vapor concentration cell using Mg-Al CO<sub>3</sub><sup>2-</sup> LDH as electrolyte showed water vapor partial pressure dependence and obeyed the Nernst equation, indicating that the hydroxide ion transport number of Mg-Al CO<sub>3</sub><sup>2-</sup> LDH is almost unity. The ionic conductivity of Mg(OH)<sub>2</sub>, MgCO<sub>3</sub> and Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> was also examined. Only Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> showed high hydroxide ion conductivity of the order of 10<sup>-4</sup> S cm<sup>-1</sup> under 80% relative humidity, suggesting that Al<sub>2</sub>(CO<sub>3</sub>)<sub>3</sub> is an ion conducting material and related to the generation of carrier by interaction with water. To discuss the ionic conduction mechanism, Mg-Al CO<sub>3</sub><sup>2-</sup> LDH having deuterium water as interlayer water (Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O)) was prepared. After the adsorbed water molecules on the surface of Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) were removed by drying, DC polarization test for dried Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) was examined. The absorbance attributed to O-D-stretching band for Mg-Al CO<sub>3</sub><sup>2-</sup> LDH(D<sub>2</sub>O) powder at around the positively charged electrode is larger than that before polarization, indicating that the interlayer in Mg-Al CO<sub>3</sub><sup>2-</sup> LDH is a hydroxide ion conduction channel.
Matsuda, Atsunori,Honjo, Hiroshi,Hirata, Kazuki,Tatsumisago, Masahiro,Minami, Tsutomu The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.4
Highly proten-conductive elastic composites have been successfully prepared from $H_3PO_4$-doped silica gel and styrene-ethylene-butylene-styrene block elastic copolymer. In addition solid state electric double-layer capacitors have been fabricated using the composite as an electrolyte and activated carbon powders(ACP) hybridized with the composite as a polrizable electrode. The cyclic voltammogram of the electric double-layer capacitor fabricated demonstrated that electric charge was stored in the elecric double-layer at the interface between the polarizable electrode and the electrolyte. The value of capacitance of the capacitor was 10 F/(gram of total ACP), which was comparable to that of the capacitors using conventional liquid electrolytes.
Hasegawa, Koichi,Katagiri, Kiyofumi,Matsuda, Astunori,Tatsumisago, Masahiro,Minami, Tsutomu The Korean Ceramic Society 2000 The Korean journal of ceramics Vol.6 No.1
Thick inorganic-organic hybrid films were prepared on ITO-coated glass substrates by the electrophoretic sol-gel deposition of polyphenylsilsesquioxane particles. The morphology of the deposited films changed from the aggregate of the spherical particles to monolith by heat treatment at temperatures higher than $200^{\circ}C$. Transparency of the films was significantly improved accompanied by the morphological change of the particles. The degree of the morphological change was governed by two factors; maximum heat treatment temperature and heating rate. Transparent thick films of ca. 3$\mu\textrm{m}$ in thickness were obtained only by heat treatment at $400^{\circ}C$ for 2h with rapid heating from room temperature to $400^{\circ}C$. These films obtained were strongly adhered to the ITO-coated glass substrates and has a very smooth surface.