Abstract Beyond reasonable designing catalysts, the optimization of preparing air cathode has far-reaching implications for the development of Zinc-air batteries. In this study, the effect of Polytetrafluoroethylene (PTFE) in current collecting layer on the performance of Zinc-air battery was investigated. The results showed that as the polytetrafluoroethylene (PTFE) content and heat treatment temperature changed, the hydrophobicity and porosity of current collecting layer also changed, thereby affecting the performance of air cathode. The air cathode assembled with PTFE-3-300 possessed an excellent electrochemical performance, which was prepared by brushing PTFE and acetylene black (wherein the mass ratio of them is 18:5) on current collecting layer and then heating at 300 °C. The obtained air cathode displayed relatively small polarization loss and excellent rate performance, showing a polarization potential of - 0.405 V vs. Hg/HgO at 100 mA cm−2 and the voltage retention of 94.47% from 5 to 20 mA cm−2. Besides, the air cathode displayed excellent discharge stability maintaining average potential 1.3249 V for 100 h. Based on this work, a detailed understanding of the relationship of PTFE and current collecting layer can be achieved to improve the electrode design, architecture and fabrication.

中文翻译：

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集电层中聚四氟乙烯（PTFE）对锌空气电池性能的影响

摘要 除了合理设计催化剂外，优化空气正极的制备对锌空气电池的发展具有深远的意义。本研究研究了聚四氟乙烯（PTFE）在集电层中对锌空气电池性能的影响。结果表明，随着聚四氟乙烯（PTFE）含量和热处理温度的变化，集电层的疏水性和孔隙率也发生变化，从而影响空气阴极的性能。用PTFE-3-300组装的空气阴极具有优异的电化学性能，它是通过在集电层上刷涂聚四氟乙烯和乙炔黑（其中它们的质量比为18:5），然后在300°C下加热制备的。获得的空气阴极显示出相对较小的极化损失和优异的倍率性能，在 100 mA cm-2 下的极化电位为 - 0.405 V vs. Hg/HgO，5 至 20 mA cm-2 的电压保持率为 94.47%。此外，空气阴极显示出优异的放电稳定性，保持平均电位 1.3249 V 达 100 小时。基于这项工作，可以详细了解 PTFE 与集流层的关系，以改进电极的设计、结构和制造。