高温锂氧/空气燃料电池配方

S.S. Sandhu, K. Hinkle, J. Fellner
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摘要

本文介绍的公式是为高温锂/氧或空气燃料电池的设计和性能分析而开发的。该公式预测了电池的开路电压(EMF)、热力学效率;作为电池工作时间函数的锂(燃料)分数转换和固体产物(一氧化二锂)的形成;恒定电池电流下的电池净质量增加率;以及作为电池温度函数的(电池净质量增加率)与(向外部电力负载提供的电力)之比。根据公式计算出的数值数据预测,电池开路电压会随着电池温度的升高而降低。在 298.15-1100 K 的温度范围内,以空气为电池氧化剂源时,5bar 的电池开路电压大于 1bar 的电池开路电压。在上述温度范围内,电池的理想热力学效率随着电池工作温度的升高而降低,从约 94% 降至 77%。此外,[(电池净质量增加率)与(电池向外部电力负载提供的电力)]的比率也随着电池工作温度的升高而增加。最后,建议建立一个图 1 所示类型的物理系统,用于获取等温和等压条件下恒定电流水平的电池开路电压和电池工作电压数据,以验证所提出的公式的预测结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A High Temperature Lithium-Oxygen/Air Fuel Cell Formulation
The formulation presented in this paper has been developed for the design and performance analysis of a high temperature lithium/oxygen or air fuel cell. The formulation predicts the cell open-circuit voltage (EMF), thermodynamic efficiency; the lithium (fuel) fractional conversion and formation of the solid product (di-lithium monoxide) as a function of the cell operational time; the net cell-mass increase rate at a constant cell current; and the ratio of (the net cell-mass increase rate) to (its electric power delivery to an external electric load) as a function of the cell temperature. The numerical data calculated from the formulation predicts a decrease in the cell open-circuit voltage with an increase in the cell temperature. The cell open-circuit voltage is larger at 5bar than that at 1bar with air being the cell oxidant source over the temperature range of 298.15-1100 K. The cell ideal thermodynamic efficiency decreases with an increase in the cell operational temperature from about 94 to 77% over the temperature range mentioned above. Also, the ratio of [(the net cell-mass increase rate) to (the cell electric power delivery to an external electric load)] increases with an increase in the cell operational temperature. Finally, it is recommended that a physical system of the type sketched in Figure 1 be built for the acquisition of the open-circuit cell voltage as well as the operational cell voltage data for the constant cell current levels at the isothermal and isobaric conditions to validate the predictions of the presented formulation.
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