在30℃的4 mol/L,LiOH电解质溶液中,通过测量锂负极的自腐蚀析氢速率、极化曲线、电化学阻抗谱及电位-时间曲线,研究了Na作为合金元素及乙醇作为添加剂对锂负极的共同抑制自腐蚀析氢作用.结果表明:合金元素Na及乙醇对阴阳极反应部起到了抑制作用,但是单一添加合金元素Na或者乙醇缓蚀剂对锂负极的抑氢作用不大,而当共同添加合金元素Na及乙醇时对锂负极的抑氢效率提高明显,缓蚀率超过了80%.另外,单独添加合金元素Na时,锂负极的放电性能极不稳定,而溶液中添加乙醇后有利于提高锂负极的放电稳定性.XRD结果表明,钠与锂形成了比较理想的固溶体.
The inhibition performance of alloy element Na and ethanol inhibitor on lithium anode in 4 mol/L LiOH alkaline aqueous electrolytes at 30 ℃ was investigated using hydrogen evolution rate measurement at OCP, polarization curve, electrochemical impedance spectroscopy and voltage-time curve. The results show that alloy element Na and ethanol have inhibition effect both on anodic and cathodic reaction, but single alloy element Na or ethanol can not play an effective inhibition role on anode; only co-adding of alloy element Na and ethanol can greatly enhance the effect of inhibiting hydrogen evolution, the inhibition efficiency exceeds 80%. In addition, the property of discharge is very unstable with only adding of alloy element Na, but this problem can be resolved by adding ethanol. XRD shows that Li and Na forms perfect solid solution.
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