Effect of binder materials on cycling performance of Fe₂O₃ electrodes in alkaline solution

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• 作者：Hiroki Kitamura^a ; Liwei Zhao^b ; ^{zhaolw@cm.kyushu-u.ac.jp} ; Bui Thi Hang^c ; Shigeto Okada^b ; Jun-ichi Yamaki^b
• 关键词：Fe2O3/C material ; Binder ; Negative electrode ; Iron-air batteries
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：391-396
• 文件大小：481 K

摘要

To investigate the effects of binder materials on the electrochemical properties of Fe₂O₃ electrodes in alkaline solution, four different materials were applied as binders: polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyethelene (PE), and poly tetrafluoroethylene-co-vinylidene (P(TFE-VDF)). In KOH aqueous solutions, electrodes containing different binders showed quite different properties. The PE-containing electrode showed the highest capacity retention up to 14 cycles (330 mAh g^鈭?, 82.7%). However, capacity fading was observed subsequently, and only 24.6%capacity remained after 30 cycles. In contrast, the PTFE-containing electrode showed continuous capacity fading but the best capacity retention of 38.6%after 30 cycles. Comparing the amount of dropout Fe₂O₃ from electrodes after charge/discharge measurements, it was reasonable to find that the electrodes with better cycling performance showed less Fe₂O₃ dropout. When K₂S additives were applied, both the electrodes fabricated with PTFE and PE showed superior cycling performance, which was attributed to the good stability of PTFE and PE binders. However, when the effect of the K₂S additive on the Fe₂O₃ dropout was studied with PTFE-containing electrodes, heavier Fe₂O₃ dropout was observed in the K₂S-added electrolyte. This indicated that Fe₂O₃ dropout was not a dominant factor for the capacity fading of the electrodes.