摘要
采用均相共沉淀法合成Ba Zr_(0.1)Ce_(0.7)Y_(0.2)O_(2.9)(BZCY)粉体,并与碳酸盐复合制备不同配比的BZCY-(Li/Na)_2CO_3复合电解质。通过XRD、SEM、TG-DTA等分析方法对复合电解质粉末的结构与性能进行初步研究。结果表明,复合电解质中碳酸盐以无定形形态存在,BZCY与碳酸盐发生反应生成Ba CO_3杂相;复合电解质电导率在空气中600和450℃时分别可达0.095和0.071 S·cm^(-1),在加湿氢气中分别可达0.126和0.075 S·cm^(-1),复合电解质在空气中600℃时,400 h内长期电导率基本稳定在0.08~0.09 S·cm^(-1)。以BZCY-20%(Li/Na)_2CO_3为复合电解质的单电池表现出良好输出性能,在600和500℃时输出功率密度可达741和258 m W·cm^(-2)。600℃时0.6 A·cm^(-2)恒流放电,90 min内电池输出性能基本维持在300 m W·cm^(-2)以上。
BaZr_（0.1）Ce_（0.7）Y_（0.2）O_（2.9）（BZCY） powder was synthesized by a homogeneous coprecipitation method, and the powder was mixed with carbonate to prepare the compound with different ratios of（Li/Na）_2CO_3. The structure and electrical properties of the composite electrolytes were characterized by SEM, XRD and TG-DTA. The results show that the carbonate in the amorphous form exists in the composite electrolytes, which reacts with BZCY to form Ba CO_3. The conductivities of the composite electrolytes reach 0.095 S·cm^-1 at 600 °C and 0.071 S·cm^-1 at 450 °C in air, while 0.126S·cm^-1 at 600 °C and 0.075 S·cm^-1 at 450 °C in humidified hydrogen. The conductivity of the composite electrolytes is basically stable for a long time in 0.08~0.09S·cm^-1 within 400 h at 600 °C. The single cell prepared with BZCY-20%（Li/Na）_2CO_3 composite electrolytes shows good output performance. The maximum power densities reach 741 m W·cm^-2 at 600 °C and 258 m W·cm^-2 at 500 °C. When discharging with 0.6 A·cm^-2 at 600 °C, the output performance is basically kept above 300 m W·cm^-2 within 90 min.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第1期231-236,共6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)
