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通过固相反应法、甘氨酸-硝酸盐燃烧法和聚丙烯酰胺溶胶凝胶法合成了La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(2.85)(LSGM)粉体,并与二元碳酸盐复合,制备了低温下具有高离子电导率和良好稳定性的新型LSGM-(Li/Na)_2CO_3复合电解质。研究了LSGM粉体制备方法和二元碳酸盐含量对复合电解质性能的影响。结果表明,LSGM-碳酸盐复合电解质存在电导跃迁温度,且在跃迁温度以上电导率明显提高,600和450℃时分别高达0.122和0.08 S·cm~(-1)。以LSGM-碳酸盐复合物为电解质的单电池表现了良好的性能输出,600和500℃时最高输出功率密度可达617和311 m W·cm~(-2)。同时,电池输出功率和开路电压(OCV)受LSGM形貌、尺寸和碳酸盐含量的影响,以碳酸盐含量为20%(质量分数)的复合物为电解质的单电池性能最佳。
La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 0.2 - 2.85 (LSGM) powders were synthesized by solid-state reaction, Binary carbonate composite to prepare a novel LSGM- (Li / Na) 2 CO 3 composite electrolyte with high ionic conductivity and good stability at low temperature. The effects of preparation methods of LSGM powders and binary carbonate content on the properties of composite electrolytes were studied. The results show that there is a transition temperature at the transition temperature of the LSGM-carbonate electrolyte, and the conductivity of the LSGM-carbonate electrolyte increases obviously above the transition temperature, reaching 0.122 and 0.08 S · cm -1 at 600 and 450 ℃, respectively. The cell with LSGM-carbonate complex as electrolyte showed good performance output with maximum output power density of 617 and 311 mW · cm -2 at 600 and 500 ℃. At the same time, the battery output power and open circuit voltage (OCV) are affected by the morphology, size and carbonate content of LSGM. The single cell with electrolyte containing 20% (mass fraction) carbonate is the best one.