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钠β氧化铝(Na_2O·7～11Al_2O_3)是一种快离子导体材料,300～350℃的离子导电率为10~(-1)欧姆~(-1)·厘米~(-1),可用作钠电极高能电池、电化学器件或电解池的电解质隔膜。但是在传输钠离子电流过程中,可能引起钠沉积作用,即钠原子在β氧化铝晶格内或多晶材料晶界内沉积积累,从而使材料破裂或产生电子电导,是影响其使用寿命的一个重要原因。对损坏后的β氧化铝电解质隔膜进行分析和研究发现,在裂纹附近的钠较为集中,许多实验表明,钠沉积现象是在Na~++e→Na的反应界面上,即钠离子转变为金属钠时发生。
Sodium β alumina (Na 2 O 7 ~ 11 Al 2 O 3) is a kind of fast ionic conductor material with ion conductivity of 10 -1 Ω · cm ~ (-1) at 300 ~ 350 ℃ For sodium electrode high-energy batteries, electrochemical devices or electrolytic cell electrolyte membrane. However, in the process of transporting sodium ions, the sodium deposition may be caused by sodium deposition in the β-alumina crystal lattice or in the grain boundaries of the polycrystalline material, which may rupture the material or produce electron conductance, which affects its service life An important reason. Analysis and study on the damaged β alumina electrolyte membrane showed that sodium near the crack was more concentrated. Many experiments showed that the sodium deposition was on the reaction interface of Na ~ ++ e → Na, that is, the sodium ion was changed to metal Occurs when sodium.