摘要
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）O_（2.85）（LSGM） powders were synthesized by solid state reaction（SSR）, glycine-nitrate process（GNP） and acrylamide polymerization（AP）, separately. Novel composite electrolytes were obtained by mixing LSGM powders with binary carbonates.The effect of preparation method of LSGM powders and contents of binary carbonate on the performance of the composite electrolytes was investigated. The results show that the conductivity behavior of LSGM-carbonate composite electrolytes has a transition temperature. The conductivities of the composites are much higher than that of pure LSGM, reaching 0.122 S·cm（-1） at 600 °C and 0.08 S·cm（-1） at 450 °C. The maximum power densities reach 617 m W·cm（-2）at 600 °C and 311 m W·cm（-2）at 500 °C for SOFC with LSGM-carbonate composite electrolytes. The output performance and OCV are influenced by LSGM morphology, size and carbonate content. The composite electrolyte with 20 wt % carbonate shows the best performance.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第1期257-261,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(U1462112
21573122)
国际合作项目(2013DFG41460
2013DFG60080)
国家重点基础研究发展计划("973"计划)(2012CB215401)
