低温SOFC复合电解质LSGM-碳酸盐的制备及性能

Preparation and Properties of LSGM-(Li/Na)2CO3 composite electrolytes for IT-SOFC

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La0.9Sr0.1Ga0.8Mg0.2O2.85（LSGM）粉体，并与二元碳酸盐复合，制备了低温下具有较高离子电导率和良好稳定性的新型LSGM-(Li/Na)2CO3复合电解质。结果表明，LSGM-碳酸盐复合电解质具有电导跃迁温度，且电导率得到明显的增强，600℃和450℃时分别达到0.122Scm-1和0.08Scm-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，600℃和500℃时最高输出功率密度可达617mWcm-2和311mWcm-2，电池输出功率和OCV受LSGM形貌、尺寸和碳酸盐含量的影响，20wt%碳酸盐含量的复合电解质电池性能最佳。

Abstract:

La0.9Sr0.1Ga0.8Mg0.2O2.85(LSGM) powders were synthesized by solid state reaction, glycine-nitrate process and acrylamide polymerization, respectively. Novel composite electrolytes were obtained by mixing LSGM powders with binary carbonates. 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 0.122Scm-1 at 600℃ and 0.08Scm-1 at 450℃，The maximum power densities reach 617mWcm-2 at 600℃ and 311mWcm-2 at 450℃ for SOFC with LSGM-carbonate composite electrolytes. The output performance and OCV is influenced by LSGM morphology,size and carbonate content. and the composite electrolyte with 20 wt % carbonate show the best performance.