锌空气电池电极表面渗液现象的研究  

On the Zinc Air Battery Electrode Surface Seepage Phenomenon

作　　者：杨永青[1] 徐献芝[1] 李清宇[1] 刘晓毅[1] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230027

出　　处：《实验力学》2012年第5期637-642,共6页Journal of Experimental Mechanics

基　　金：国家自然科学基金(项目编号:10872193)

摘　　要：渗液问题是锌空气电池的主要问题之一。本文通过如下实验:聚四氟乙烯膜(PTFE,poly tetra fluoro ethylene)表面特性实验、电池风冷放电、空气电极电压实验和类列斯实验,对可能影响电池渗液的因素进行了研究。这些因素包括:PTFE膜、温度、电压、电荷总量、电解质溶液。实验结果表明:PTFE膜经过KOH溶液浸泡一段时间后,其接触角会显著变小,疏水性变差;温度和电压会对渗液现象产生影响;在各类电解质溶液中,KOH溶液渗液最严重;放电过程中的电荷总量对渗液问题基本没影响。实验结果分析得出,这类电池渗液主要是由于上述因素导致电解液表面张力变化,引起气液界面移动导致的。Seepage is one of the main problems of zinc air battery.Factors that may affect the battery seepage were investigated through following experiments： PTFE（poly tetra fluoro ethylene） film surface properties experiment,battery cooling discharge experiment,air electrode voltage experiment and Antilliean electro-osmosis test.These involved factors include PTFE film,temperature,voltage,charge quantity and electrolyte solution.Experimental results show that after soak in KOH solution for a period of time,the contact angle of PTFE film becomes significantly small and its hydrophobic property deteriorates;temperature and voltage indeed have influence on seepage phenomenon;KOH solution seepage is the most serious in all kinds of electrolyte solution;the total charge in discharge process basically has no influence on seepage.Based on analysis of experimental results,it is concluded that the battery seepage is caused by the change of electrolyte solution surface tension induced by above factors,which results in gas-liquid interface movement.Above results are valuable for improving the performance of zinc air battery.

关 键 词：表面张力 渗液 表面特性 疏水性 空气电极 聚四氟乙烯膜(PTFE) 

分 类 号：TM911.41[电气工程—电力电子与电力传动]