Satoshi Sekido

Electric-ionic conductivity in perovskite-type oxides, SrxLa1-xCo1-yFeyO3-σ

Tghe electric conductivity (σ), oxides in conductivity (σ)2 and oxide ion vacancy (δ) for SrxLa1-xCo1-yFeO3-δ were measureds from room temperqatrure to 900°C and inair atmosphere amd mainly 10 ppm CO to inverse how the oxide ion vacancy effects the electric-ionic conduction. The influence of addition ot SrFeO5La35Cu1-yFe0.3O3-δ on the rtelations was also eveluated. It is founsd that the subsitutionof Sr for La and the additoin of SrTiO3 and Pd facilitate the development of the oxide ion vacancy at high temperature and in reducible gas atmosphere, and the increase of oxide ion vacancy

Solid-state electric-double-layer elements using Cu+ ion conductive solid electrolyte

Abstract The components for constructing a Cu-based double-layer element, high-energy-density capacitor and potential memory element were studied. The high-energy capacitor, which is constructed with a carbon polarization electrode and a polyphase counter electrode (Cu 60 wt%) exhibited nearly comparable performance to a Ag-based cell. The potential memory element constructed with three Cu 2 S electrodes has ≈1000 times larger capacity; however, the practical potential range is about half that of a Ag-based one.

Solid state micro power sources

Abstract Shrink of power source to miniature size is an urgent necessity for batteries to electronic devices developed recently, and solid electrolyte is a best candidate to shrink the power source. Then, the extensive studies have been concentrated in the solid state power sources, and yielded primary batteries using Li + ion conductor and rechargeable power sources as double layer capacitors and secondary battery using either Ag + or Cu + ion conductors. This review describes the current status of power sources and discuss an interesting area in future study.

Sensor for detecting the stoichiometric composition in a combustion flame

Abstract The performance of Sr 0.65 La 0.35 Co 0.7 Fe 0.3 O 3−δ as a sensor, as well as it calatytic activity, are studied in relation to additions of SrTiO 3 and the further addition of Pd. The temperature dependence of the sensor with more than 40 mol% SrTiO 3 at temperature below 400°C is semiconductor like and does not rely on the gas atmosphere, which allows us to use the material as a temperature sensor ( e.g )., a flame detector). Gas sensitivity occurs at temperature above 400°C and the addition of 60 to 70 mol% SrTiO 3 gives the highest sensitivity, response and catalytic activity. The working temperature can be lowered by about 100°C by the further addition of Pd. Additions of SrTiO 3 and Pd also improve the lifetime of the device.

Solid state photorechargeable cells using the complexed electrode consisted of semiconductor and Chevrel compounds

Abstract In order to investigate how photoelectrode material and construction method affect photocharging and discharging characteristics, the following cells were constructed: ( Stacked electrode cells ) Semiconductor, X (Solid state electrolyte)/Cu 2 Mo 6 S 8 , X/ X/Cu 2 Mo 6 S 8 , X; ( Mixed electrode cells ) Semiconductor, Cu 2 Mo 6 S 8 , X/X/Cu 2 Mo 6 S 8 , X. TiS 2 , ZrS 2 , and TiO 2 were preliminarily studied as the semiconductor material in stacked cells. As a result, it was found that the cell having solely Cu 2 Mo 6 S 8 is the best at increasing photocharging current and improving discharge capacity.

Reaction mechanisms in the Li/LiI/1−n-butylpyridinium polyiodide solid electrolyte cell

Abstract A Li/(BPIa+SiO2 gel) cell, in which BPIa represents the 1−n-butylpyridinium polyiodide charge-transfer complex, has been investigated by measuring internal cell resistances (Ri) and the self-discharge capacities (Qs) estimated from the chemical analysis of the cathode mixtures. The activation energy as determined from the temperature dependence of Ri is for ionic conduction in the solid electrolytes. It is 12 kcal/mol and maintains a nearly constant value during the storage period. However, the value is reduced to 7–8 kcal/mol after the initiation of cell discharge. The value of Qcs followed the parabolic law after the initial storage period up to ≈50 days at 20°C, i.e. Q s ( mA h / cm 2 of Li anode )=4.3+0.034 t 1 2 (t in hours). The above iodine losses during storage are decreased by a preliminary discharge of more than 2 mA h/cm2, immediately after constructing the cell.