| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
There have been many works on inorganic solid electrolytes. Recently, many investigations on polymer solid electrolytes have been done, because of their flexibility and capability of fabrication of thin and light devices. However, studies on multivalent cationic conductive solid electrolytes are few. In this study, multivalent cation, such as Zn or Mg, conductive solid electrolytes both of inorganic and organic types have been investigated. At first, electrical conduction mechanism in solid electrolytes, M^IZr_2 (PO_4) _3, M^<II>Zr_4 (PO_4) _6, and M^<III>Zr_6 (PO_4) _9, with zirconium phosphate framework has been investigated by using frequency dispersion analysis. All solid-state carbon dioxide (CO_2) gas sensor has been constructed by using MgZr_4 (PO_4) _6 [MgZP] and Na_2CO_3 and studied its response characteristics. Improved CO_2 sensor using partially substituted MgZP with Si for PO_4 has been constructed and proved to show higher performance than above mentioned one. A system of partially substituted MgZP with Ti for Zr has been studied by electrical conductivity measurement and XRD analysis to show that MgTi_<0.5>Zr_<3.5> (PO_4) _6 has a maximum electrical conductivity. CO_2 gas sensor constructed by using MgTi_<0.5>Zr_<3.5> (PO_4) _6 and Na_2CO_3 has been reported. Multivalent cation conductive solid polymer electrolytes have been prepared by photo-crosslinking and reinforcing to a micro-porous membrane from precursor solutions of zinc halides, ethylene carbonate, prophlene carbonate, photo-polymerizing monomers, and initiator. Those solutions of magnesium halides could not be prepared because of their poor solubility. The electrical conductivities of the polymer electrolytes of ZnBr_2 and ZnI_2 were in the same order of magnitude of 10^<-5> S cm^<-1> as those of Li salts at room temperature. The system of Zn (CF_3SO_3) _2 has also been investigated.
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