Investigation of the wetting behavior of Na and Na alloys on uncoated and coated Na-β"-alumina at temperatures below 150 A°C
Investigation of the wetting behavior of Na and Na alloys on uncoated and coated Na-β"-alumina at temperatures below 150 A°C
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DOI：
10.1007/s11581-017-2017-x
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发表时间：
2017-05-01
期刊：
影响因子：
2.8
通讯作者：
Hoffmann, M. J.
中科院分区：
文献类型：
--
作者：
Ahlbrecht, K. .;Bucharsky, C.;Hoffmann, M. J.
如果操作温度低于270-300 A ℃，Na在Na-β”-氧化铝上的润湿不足是Na电池中界面极化增加的原因。在这项研究中，在陶瓷表面上的Na合金（Na-Sn，Na-Bi和Na-In）的能力，以提高在中等温度下与熔融钠的润湿性，从而使电池在105至150摄氏度的温度范围内的操作进行检查。具有Bi或Sn的金属涂层证实了在115 A摄氏度的温度下的这种改进。通过恒电流循环和电化学阻抗谱确定对称Na 2-，Na-β-氧化铝-，Na电池的过电位，然后与接触角测量相关联。因此，合金和金属涂层都对润湿和恒电流循环期间过电位的降低具有积极影响。
Insufficient wetting of Na on Na-beta"-alumina is responsible for an increased interfacial polarization in Na-batteries if the operating temperature is below 270-300 A degrees C. In this study, Na alloys (Na-Sn, Na-Bi and Na-In) on the ceramic surface are examined on their capability to improve the wetting with molten sodium at medium temperatures and thereby enabling operation of the cell at temperatures in the range of 105 to 150 A degrees C. Metallic coatings with Bi or Sn confirm this improvement at a temperature of 115 A degrees C. The overpotential of a symmetrical Naa",Na-beta"-aluminaa",Na cell is determined by galvanostatic cycling and electrochemical impedance spectroscopy and then associated to contact angle measurements. As a result, both the alloys and the metallic coatings have a positive impact on wetting and reduction of the overpotential during galvanostatic cycling.