| Summary: | 碩士 === 南臺科技大學 === 化學工程與材枓工程系 === 107 === This study focused on the preparation of LSO/carbonate composite electrolyte which could reduced cell operating temperature below 600℃. The LSO/LiNaCO3 composite electrolyte material was a multi ionic conductor (O2-/H+/CO32-) that enhances the conductivity of ions under low temperature operating conditions.This study investigated the effects of composite powder calcination temperature, sintering temperature and carbonate content on the electrical conductivity of LSO/LiNaCO3 composite electrolyte.
According to the Arrhenius plots that the conductivity of the LSO/LiNaCO3 composite electrolyte has better than LSO electrolyte regardless of the sintering temperature and carbonate content. The XRD and TEM results showed that the LSO/LiNaCO3 composite electrolyte as the carbonate content increases carbonate from amorphous to crystalline and the grain size increases significantly. Addition, carbonate could increase the density of the composite electrolyte sintered body.
Conductivity analysis has been found that the LSO/LiNaCO3 composite electrolyte have different conductive behaviors among the middle and low temperature rang divided by 525℃ that the two different conductive behaviors were mainly due to carbonate phase. Moreover, the higher conductivity at the middle temperature range. The conductive increasesd with increasing of carbonate content. LSO/LN50 composites electrolyte have the optimal conductivity in the middle temperature range, the best conductivity of 1.17×10-2 S･cm-1 at 650℃ with an activation energy of 0.39 eV；the conductivity of 5.86×10-5 S･cm-1 at 450℃ with an activation energy of 0.96 eV.
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