Improvement of Electrode Performance on the Alkali Metal Thermal to Electric Converter

碱金属热电转换器电极性能的改进

• 批准号: 13680583
• 负责人: TANAKA Kotaro
• 金额: $ 1.6万
• 依托单位: Shizuoka Institute of Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680583/
• 关键词: Thermoelectric Converter; Direct Energy Conversion; AMTEC; Laser-induced CVD; Molybdenum Electrode; アルカリ金属熱電変換; エネルギー変換; 熱再生型電池

Micron-scale current collection leads for the Alkali Metal Thermal to Electric Converter (AMTEC) have been proposed and discussed in this study. The current collection leads are directly deposited on cathode side surfaces of the solid beta"-alumina electrolyte to eliminate the necessity for the conventional tied-on metal meshes. The new current collection leads also reduce electrical and mass transfer resistance in the cathode side electrodes of the AMTEC devices.The mass transport characteristics of sodium through the porous electrode strongly influence the output performance of the AMTEC cycle. Electrode electrical resistance and contact resistance between the porous electrode and the current collector also cause significant lowered power output in the AMTEC cycle. In order to improve the overall performance, both mass transport and electrical resistance must be improved simultaneously. The micron-scale current leads have a possibility to lower the overall electrical resistance with … More small increase in the mass transport resistance.The sodium exposure test cell (SETC) was newly fabricated and used to measure the mass transfer characteristics in the porous molybdenum electrode. The measured performance was examined and a mass transport model on the electrodes was introduced. On the other hands, the electrical characteristics of the leads were experimentally examined. The current leads of molybdenum were linearly deposited by Ar laser-induced thermal CVD method. The influence of depositing conditions, such as pressure, laser power, and writing speed, on the formed width and thickness of the leads was examined. The electrical resistance was also measured and the measured volumetric resistance of the deposited leads was 4-6 times as high as that of the bulk molybdenum.The analysis based on the measured data was also conducted. Various configurations include optimum width, distance and thickness were calculated. Compared result of the electrode performance having direct deposited current leads with that of the conventional tied-on collector has shown that its power density is about 35% higher even with its low electrical volumetric resistance. The effective of the current lead structure proposed in this study was verified. If the volumetric resistance of the deposited leads can be improved, much higher performance is expected with this method. Less

本研究提出并讨论了碱金属热电转换器（AMTEC）的大规模电流收集引线。电流收集引线直接沉积在固体β ″-氧化铝电解质的阴极侧表面上，以消除对传统的捆绑金属网的需要。新的电流收集引线还降低了AMTEC装置的阴极侧电极中的电和传质阻力。钠通过多孔电极的传质特性强烈影响AMTEC循环的输出性能。电极电阻和多孔电极与集电器之间的接触电阻也导致AMTEC循环中显著降低的功率输出。为了提高整体性能，必须同时提高传质和电阻。微米级电流引线具有降低总电阻的可能性， ...更多信息 采用自制的钠暴露试验池（SETC）对多孔钼电极的传质特性进行了研究。测试性能进行了检查，并介绍了电极上的传质模型。另一方面，实验检查了引线的电特性。采用Ar激光诱导热化学气相沉积方法，制备了钼电流引线。研究了压力、激光功率和写入速度等沉积条件对引线宽度和厚度的影响。测量了电阻，测得沉积引线的体积电阻是钼体的4-6倍，并对测量数据进行了分析。计算了各种构型的最佳宽度、距离和厚度。具有直接沉积的电流引线的电极性能与传统的捆绑式集电器的电极性能的比较结果表明，即使其体积电阻低，其功率密度也高约35%。验证了本研究所提出的电流引线结构的有效性。如果可以改善沉积的引线的体积电阻，则使用该方法预期高得多的性能。少

项目成果

Kotaro Tanaka: "Thermal Designing on a Small-Sized AMTEC Cell"Pro.37^<th> Intersociety Energy Conversion Conference. 20021-1-20021-6 (2002)

Kotaro Tanaka：“小型 AMTEC 电池的热设计”Pro.37^<th>国际能源转换会议。

K.Tanaka: "Wick Design Method and Simulation of Sodium recirculation for AMTEC Cycles"Proc. 2^<nd> Waste Heat Utilization Technology Workshop. 38-45 (2001)

K.Tanaka：“AMTEC 循环钠再循环的灯芯设计方法和模拟”Proc。

Kotaro Tanaka: "Experimental Evaluation of Electrode Conversion Efficiency of Alkali Metal Thermal to Electric Converter"Heat Transfer-Asian Research. 30・3. 234-244 (2001)

田中幸太郎：“碱金属热电转换器的电极转换效率的实验评估”《传热-亚洲研究》30・3（2001）。

K.Tanaka: "Experimental Evaluation of Electrode Conversion Efficiency of Alkali Metal Thermal to Electric Converter"Hear Transfer-Asian Research. 30・3. 234-244 (2001)

K.Tanaka：“碱金属热电转换器的电极转换效率的实验评估”Hear Transfer-Asian Research 30・3（2001）。

田中耕太郎: "低温作動型AMTECセルの発電性解析"化学工学論文集. 27・6. 819-823 (2001)

田中幸太郎：“低温运行 AMTEC 电池的发电性能分析”化学工程学报 27・6（2001 年）。