PVA-PAA-KOH碱性聚合物电解质膜的制备及其性能  

Preparation and properties of PVA-PAA-KOH alkaline polymer electrolyte membrane

作　　者：陆霞[1] 吴仁香[1] 朱云峰[1] 李李泉[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《功能材料》2013年第4期590-594,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51071085;51171079);教育部高等学校博士学科点专项科研基金资助项目(20093221110008);江苏省高校优势学科建设工程资助项目(PAPD)

摘　　要：采用溶液浇铸法,向PVA溶液中加入不同中和度的AA,在引发剂、交联剂的作用下,经原位聚合得到PVA-PAA共混膜;接着采用碱液活化法,制备了PVA-PAA-KOH碱性聚合物电解质膜。通过扫描电镜、X射线衍射、红外光谱等测试手段研究了聚合物共混膜的形貌与结构,同时采用交流阻抗、循环伏安法表征聚合物电解质膜电化学性能。研究表明,成功制备了均相PVA-PAA共混膜,同时PAA的合成可以提高体系的含水量以及降低PVA的结晶度。电解质膜的离子电导率最大可达3.55×10-2S/cm,PVA-AA配比为7∶3的碱性聚合物电解质膜综合性能最优,电化学稳定窗口2V以上,能够满足镍氢电池的要求。PAA was prepared by the situ polymerization of AA with various neutralization degrees in PVA solution under the action of initiator and crosslinker and PVA-PAA blended membrane was prepared by the solution casting method.PVA-PAA-KOH alkaline polymer electrolyte was activated by the alkaline solution.The morphology and structure of the polymer electrolyte were characterized by means of SEM,XRD and FT-IR.The electrochemical properties were represented by the AC impedance and the cyclic voltammetry.The results indicated that a homogeneous PVA-PAA blended membrane was successfully obtained.The increased water content of the membrane and the decreased crystallinity of the PVA owed to the presence of PAA.The maximum ionic conductivity of the electrolyte reached to 3.55×10-2 S/cm.The alkaline polymer electrolyte with 7∶3 mass ratio of PVA∶AA could achieve a good synthetical property with electrochemical stability window more than 2V and could meet the demands of MH-Ni battery.

关 键 词：PVA-PAA 碱性聚合物电解质膜 原位聚合 离子电导率 电化学稳定窗口 

分 类 号：TM911[电气工程—电力电子与电力传动]