【摘要】 钠硫电池中 Na/β″-Al₂O₃界面上的极化可以出现电阻增加、非欧姆电池电阻、不对称电池电阻以及瞬态高电池电阻。应用低频交流法测量了电池阻抗对频率的依从性,研究了电池充放电过程中阻抗膜在 Na/β″-Al₂O₃界面上的形成过程。实验结果表明在电池放电中电阻的增加、瞬态的高电阻与β″-Al₂O₃管的内表面富钠以及β″-Al₂O₃在钠电极中的表面退化有关。β″-Al₂O₃的表面退化,因形成局部高的充电电流密度,导致固体电解质钠沉积的贯穿而损坏。提山了各种机理解释了β″-Al₂O₃表面退化现象。更多还原

【Abstract】 Interfacial polariszation on the Na/β″-Al₂O₃ interface can manifest itself in thesodium-sulfur cells as resistance rise,non ohmic cell resistance,asymmetric cells re-sistance and transient high cell resistance.Using an a.c.method at low frequencies,the dependence of cells impedance on frequencies were measured and the formativeprocess of the resistive surface film on the Na/β″-Al₂O₃ interface was studied duringcharge-discharge cycles.These results shew that the observed resistance rise andtransient high cell resistance on cell discharge were associated with the soda richon the inner surface of β″-Al₂O₃ tube and the surface degradation of β″Al₂O₃in the Sodium electrode.The surface degradation of β″-Al₂O₃ may lead to thefailure of the solid electrolyte by sodium deposition penetration due to locally highcharging current density.Various mechanisms have been proposed to explain thedegradation phenomena.更多还原