Thermal batteries with ceramic felt separators - Part 2: Ionic conductivity, electrochemical and mechanical properties

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• 作者：Seung-Ho Kang^a ; ^d ; Sang Hyeok Chae^b ; Hae-Won Cheong^a ; Kyung-Ho Kim^c ; Yoon Soo Han^c ; Sung-Min Lee^c ; Dang-Hyok Yoon^b ; ^{dhyoon@ynu.ac.kr} ; Junsin Yi^d ; ^{junsin@skku.edu}
• 关键词：Thermal batteries ; Ceramic felt ; Ionic conductivity ; Electrochemical properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：4023-4028
• 全文大小：1221 K
• 卷排序：43

文摘

In this Part 2, the ionic conductivity of molten salt electrolytes, the electrochemical properties of single cells containing a ceramic separator infiltrated with an electrolyte, and the mechanical strength of the electrolyte layer are compared with those of the conventional pellet-pressed structure. The ionic conductivity for the molten electrolyte is higher than that of the previous report for both LiCl-KCl and LiF-LiCl-LiBr electrolytes, which is explained by the decrease in contact resistance using a graphite electrode instead of stainless steel. The electrochemical performance of the single cells containing a ceramic felt separator assembled with Li(Si)/FeS2 electrodes shows longer operating time to a cut off voltage of 1.3 V compared to the conventional MgO-contained single cell. In addition, the flexural strength of the electrolyte layer with the ceramic felt separators is in the range of 2.80–6.29 kgf cm−2, which is incomparable to that (=0.01 kgf cm−2) of the pellet-pressed conventional separator. These findings suggest that the ceramic felt separator can be an alternative to mitigate the current problems of pellet-pressed structure in thermal batteries, enhancing the mechanical strength and electrochemical properties.