摘要
应用钠硫电池和钠-钠电池测量了钠β″氧化铝固体电解质在不同直流通电方向上的不对称极化.与钠β″氧化铝相比,许多多晶β″氧化铝陶瓷管具有不对称极化,即放电(钠离解)电阻大于充电(钠沉积)电阻.不对称极化电池放电电阻随工作循环周次增加,其充电电阻保持稳定或降低.实验结果认为,不对称的极化与β″氧化铝内表面富钠阻抗膜(高钠含量)和不良的微观结构(大晶、气孔)有关,由于电池充电时产生不均匀树枝状钠沉积所致.电池显著的不对称极化能降低电池的工作效率,促使β″氧化铝电解质的早期损坏.
An asymmetric polarization of sodium β”-Al_2O_3 tube with respect to the direction of theflow of d.c.current was measured by using the sodium-sulfur and sodium-sodium cells.Incontrast to Na β-Al_2O_3,many polycrystalline samples of the β”-Al_2O_3 tubes always display anasymmetric polarisation behavior,in other words the discharge resistance(sodium dissolution)is larger than the charge resistance(sodium deposition).The discharge resistance of cell is in-creased and the charge resistance is stable or decreased with the cycling time of sodium-sulfurcell.Experimental results show that the asymmetric polarization is caused by the inhomo-geneous dendritic sodium deposition during the charge,which is associated with a soda-richresistive film on the inner surface of beta”-alumina tube(high sodium content)and unfavor-able microstructure(large crystal and pore).Significant asymmetric polarization can lower theefficiency of cell and even result in the earlier electrolyte failure.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第4期435-441,共7页
Journal of Inorganic Materials
基金
国家自然科学基金
关键词
氧化铝
固体电解质
钠硫电池
Beta”-alumina
Solid electrolyte
Sodium-sulfur cell
Sodium ion conductor
