PIN/PAN聚合物基电解质膜的制备及性能

Preparation and Properties of PIN/PAN Polymer Electrolyte Film

摘要:

利用静电纺丝技术制备了聚吲哚/聚丙烯腈(PIN/PAN)聚合物基电解质膜,代替纸基铝空气电池中的纤维素纸(C-P),并应用于固态铝空气电池。探究了PIN含量对电解质膜离子电导率及吸液率的影响。采用SEM和FTIR对PIN/PAN聚合物基电解质膜表面形貌及化学组成进行分析。借助电化学工作站和电池测试系统,分析了电解质膜离子电导率及固态铝空气电池放电特性。结果表明,采用PIN/PAN聚合物基电解质膜可有效提升固态铝空气电池性能,在3 mA.cm_^-2、5 mA.cm_^-2、7 mA.cm_^-2电流密度下,放电时长比纸基铝空气电池分别提升了21%、27%、34%,且放电时长与电解质膜的吸液率及离子电导率相关。其中4%PIN/PAN聚合物基电解质膜离子电导率可达6.7×10_^-4 S.cm_^-1,同时对碱性溶液具有良好的吸附能力,吸液率最高可达496%,为纤维素纸的3.2倍。

Abstract:

PIN/PAN(Polyindole/Polyacrylonitrile)films were prepared by electrospinning to replace cellulose paper(C-P)in paper-based aluminum air and applied to thin film aluminum air batteries. This study analyzed the influence of PIN content on the ionic conductivity and liquid absorption rate of thin film electrolyte. The surface morphology and chemical composition of PIN/PAN films were analyzed by SEM and FTIR. The ionic conductivity and discharge characteristics of thin film electrolyte were analyzed by electrochemical workstation and battery test system. The results show that PIN/PAN thin film electrolyte can effectively improve the performance of thin film aluminum air battery. At 3 mA cm_^-2,5 mA cm_^-2and7 mA cm_^-2, the discharge time is about 21%, 27% and 34% higher than that of paper-based aluminum air battery, and the discharge time is related to the liquid absorption rate and ionic conductivity of thin film electrolyte. The ionic conductivity of electrolyte prepared by 4% PIN/PAN film is 6.7×10_^-4 S.cm_^-1, and it has good adsorption capacity for alkaline solution. The highest liquid absorption rate is 496%,which is 3.3 times higher than that of cellulose paper.