摘要
采用柠檬酸络合法制备了(Sc2O3)0.06(Al2O3)x(ZrO2)0.94–x(x=0,0.005,0.01,0.02)系列电解质材料。通过X射线衍射、扫描电子显微镜、电化学交流阻抗谱和力学性能测试等方法对试样进行了分析,并研究了Al2O3掺杂量对电解质材料性能的影响。结果表明:Al2O3掺杂能很好的促进电解质的烧结,有效的降低晶界电阻并提高其抗弯强度。当Sc2O3和Al2O3掺杂量分别为6%和1%摩尔分数时,800℃时氧离子电导率为0.050 S/cm,室温抗弯强度达912 MPa。采用厚度为120μm该电解质片做支撑的电池在800℃最高功率密度为0.43 W/cm2,且在0.625 A/cm2恒流放电200 h后该电池性能没有衰减。
The(Sc2O3)0.06(Al2O3)x(ZrO2)0.94–x(x=0, 0.005, 0.01, 0.02) series powders were prepared via a nitrate-citrate route. The obtained electrolyte material samples were characterized by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy and mechanical test, and the effect of Al2O3-doping on the properties of the electrolyte materials was investigated. The results indicate that the Al2O3-doping can promote the sintering of the electrolyte material, reduce the resistance of the grain boundaries and improve the flexural strength. When the Al2O3-doped amount is 1% in mole, the ionic conductivity of the(Sc2O3)0.06(Al2O3)0.01(Zr O2)0.93 sample is 0.05 S/cm at 800 ℃ and the flexural strength is 912 MPa at room temperature. The optimum power density measured at 800 ℃ is 0.43 W/cm2 for the cell with this material as an electrolyte, and little degradation is discovered after 200 h test under a constant current discharge of 0.625 A/cm2.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2015年第1期1-7,共7页
Journal of The Chinese Ceramic Society
基金
国家高技术研究发展计划(863计划
2011AA050703)项目
