A numerical model is created to simulate the discharge performance of aluminum-air batteries (AABs) with alkaline electrolyte. The discharge voltage and power density, as a function of the discharge current density, are predicted for the modeled AAB and compared with experimental measurements. A good agreement between model and experiment is found. The effect of various model parameters on the battery performance is studied by adjusting the parameters within a suitable range. The results show that electrolyte thickness is a key factor that can strongly increase the power density and the corresponding current density as the electrolyte thickness decreases. The peak of power density is increased by a factor of two if the electrolyte thickness is reduced from 7 mm to 3 mm. The alkaline concentration is also an important factor, since both the voltage and power density curves are significantly raised as the NaOH concentration is increased from 1 to 4 mol/L. The partial oxygen pressure plays a secondary role in performance improvement. The peak of power density is increased by 35% using pure oxygen in the air electrode. In addition, the active specific surface area of the catalyst layer also affects the discharge capability of the AAB system.

中文翻译：

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碱性电解质铝空气电池性能的数值模拟与分析

创建一个数值模型来模拟带有碱性电解液的铝空气电池（AAB）的放电性能。对建模的AAB预测了放电电压和功率密度（作为放电电流密度的函数），并与实验测量值进行了比较。在模型和实验之间找到了很好的协议。通过在合适的范围内调整参数来研究各种模型参数对电池性能的影响。结果表明，电解质厚度是一个关键因素，随着电解质厚度的减小，电解质厚度会大大增加功率密度和相应的电流密度。如果将电解质厚度从7 mm减小到3 mm，则功率密度的峰值将增加两倍。碱浓度也是一个重要因素，因为随着NaOH浓度从1-4 mol / L增加，电压和功率密度曲线都显着升高。氧分压在性能改善中起次要作用。使用空气电极中的纯氧可使功率密度的峰值增加35％。另外，催化剂层的活性比表面积也影响AAB系统的放电能力。