基于锌空气电池锌电极放电容量的研究

Research of zinc electrode discharge capacity based on zinc air batteries

提高锌电极放电容量是研究锌空气电池储能的重要项目。在不增加碳电极面积的前提下,通过改变锌电极的放电模式、更换放电过程中的电解液、掺混(碎海绵、电解锌)等方法提高锌电极的放电容量。实验表明:掺混碎海绵、间歇放电模式、定时更换电解液均可使锌电极放电效率增加;电解锌的掺入使单位碳电极面积下锌电极极限厚度增加,锌电极的极限添加量增加。研究结果表明:扩散是锌电极反应的重要步骤,间歇放电模式为反应产物扩散提供时间,掺入碎海绵、定时更换电解液为反应产物扩散提供场所;纯电解锌放电因颗粒小,电子传递环节多,放电功率低;电解锌与锌粉混合,在反应过程中大颗粒的锌粉与电解锌逐个激化,此起彼伏,达到一种间歇模式,同时电解锌在锌电极中起到活性因子和造孔剂的作用,提高了单位碳电极面积的锌电极厚度。

Increasing the discharge capacity of the zinc electrode is an important research project for zinc-air battery energy storage.Under the premise of without increasing the area of the carbon electrode,changing the discharge mode of the zinc electrode,electrolyte replacement in discharging process,mixing of impurities,electrolytic zinc and other methods were used to increase the discharge capacity of the zinc electrode.Experimental results show that the zinc electrode blending broken sponge,intermittent discharge mode,regular replacement of the electrolyte can increase the efficiency of the discharge; electrolytic zinc incorporation of carbon per unit area of the electrode increases zinc electrode thickness.The results show that the diffusion of zinc is an important step in the electrode reaction,the reaction product of an intermittent discharge mode for providing time diffusion,incorporation of broken sponge,regular replacement of the electrolyte solution to provide a reaction product diffusion properties; pure electrolytic zinc discharge due to small particles,more electron transfer link,the discharge power is low; electrolytic zinc is mixed with zinc powder,zinc powder in the course of the reaction with the electrolytic,zinc large particles individually sharpen,one after another,to achieve a batch mode,and electrolytic zinc plays active factors,and in the zinc electrode the role of pore forming agent to improve the zinc electrode thickness per unit of carbon electrode area.