多孔导电凝胶PAM/CNTs-PEG在锌-空气电池中的应用  

Application of porous conductive gel PAM/CNTs-PEG in zinc-air batteries

作　　者：李培枝[1] 杨海潮 程晓亮 陈志刚 张康 王晨[2] LI Peizhi;YANG Haichao;CHENG Xiaoliang;CHEN Zhigang;ZHANG Kang;WANG Chen(College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710016,China;Shaanxi Key Laboratory of Chemical Additives for Industry,The Youth Innovation Team of Shaanxi Universities,College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China)

机构地区：[1]陕西科技大学化学与化工学院,西安710016 [2]陕西科技大学功能助剂产业化研究院,教育部重点实验室,西安710021

出　　处：《复合材料学报》2024年第2期787-794,共8页Acta Materiae Compositae Sinica

基　　金：陕西省青年科技新星项目(2023KJXX-046);国家自然科学基金(22008148)。

摘　　要：为实现锌-空气电池工业化生产,优化其空气扩散电极性能,使其有利于气体的扩散,并形成更多的三相界面。导电水凝胶是由导电材料和交联聚合物网络组成,聚合物网络提供支架,而导电材料赋予水凝胶良好的导电性。多孔的结构可以给气体更多的扩散通路,也有利于催化层的负载,形成更多的三相界面。本文采用聚丙烯酰胺基水凝胶,以聚乙二醇-2000(PEG2000)为制孔剂,合成多孔聚丙烯酰胺/碳纳米管-聚乙二醇(PAM/CNTs-PEG)导电水凝胶。将制备的PAM/CNTs-PEG导电水凝胶浸泡于乙醇溶液中,可形成不同数量的介孔。本文研究了不同浸泡时间对于多孔PAM/CNTs-PEG导电水凝胶在柔性锌空电池中的性能影响。实验结果表明:乙醇浸泡5 h的导电凝胶电化学性能最好。当电压从1 mA/cm^(2)时的1.23 V到5 mA/cm^(2)时的1.11 V,仅衰减了0.12 V。8.5 mA/cm^(2)时产生最大功率密度为77.35 mW/cm^(2),且放电时具有1104.85 mA·h/g的高克容量,远高于其他导电凝胶。且有较好的导电性和应变灵敏度,可应用于传感等领域。In order to realize the industrial production of zinc-air battery,the performance of its air diffusion electrode is optimized to make it conducive to the diffusion of gas and to form more three-phase interfaces.The conductive hydrogel is composed of a conductive material and a cross-linked polymer network,the polymer network provides the scaffold,and the conductive material gives the hydrogel good electrical conductivity.The porous structure can give more diffusion paths to the gas,and is also conducive to the load of the catalytic layer,forming more three-phase interfaces.In this paper,polyacrylamide hydrogel was used to synthesize porous polyacrylamide/carbon nanotubes-polyethylene glycol(PAM/CNTs-PEG)conductive hydrogel with polyethylene glycol 2000(PEG2000)as pore-making agent.The prepared PAM/CNTs-PEG conductive hydrogels were immersed in ethanol solution to form different numbers of mesopores.The effect of different immersion time on the properties of porous PAM/CNTs-PEG conductive hydrogels in flexible zinc-air cells was studied.The experimental results show that the electrochemistry performance of the conductive gel soaked in ethanol for 5 h is the best.When the voltage changes from 1.23 V at 1 mA/cm^(2)to 1.11 V at 5 mA/cm^(2),the attenuation is only 0.12 V.The maximum power density is 77.35 mW/cm^(2)at 8.5 mA/cm^(2),and the high gram capacity of 1104.85 mA·h/g at discharge is much higher than that of other conductive gels.It has good electrical conductivity and strain sensitivity and can be used in sensing and other fields.

关 键 词：锌-空气电池 导电凝胶 聚丙烯酰胺 聚乙二醇 制孔剂 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]