金属锂电极在KOH碱性溶液中的腐蚀研究(Ⅱ)

Study on lithium electrode corrosion in KOH aqueous electrolytes(Ⅱ)

3讨论 3．1 金属锂腐蚀反应动力学参数分析 在腐蚀反应中有一些主要的参数，如腐蚀反应活化能Ea、腐蚀反应的反应速度常数kcorr等，利用这些参数可以估算发生腐蚀反应的难易程度和腐蚀速度等。通过分析温度和电解液浓度对金属锂腐蚀速度的影响，本文研究了金属锂在KOH溶液中腐蚀反应的活化能Ea、腐蚀反应速度常数kcorr、指前因子A，以及溶液中H2O的活度与KOH浓度之间的关系。

The corrosion behaviors of lithium in strong alkaline solution were studied by measuring influences of temperature and concentration of KOH solution on lithium corrosion. And the relationship between lithium corrosion rate and KOH electrolyte concentration was fitted. Based on such basic results, the corrosion dynamic parameters of lithium electrode in KOH aqueous electrolyte solution were analyzed and computed. Several important dynamic parameters of the corrosion process were obtained, including activation energy, reaction rate constant, pre-exponential factor and the relationship between H2O activity and KOH concentration in electrolyte. Furthermore, the rate controlling step for lithium corrosion and its main dynamic parameters were analyzed. And it was revealed that cathodic reduction of H2O at lithium surface was the rate controlling process for the whole corrosion process.