用于镍氢电池的PVA/PAAK碱性聚合物电解质的制备及性能  

Preparation and Properties of PVA/PAAK Alkaline Polymer Electrolytes for Nickel-Metal Hydride Batteries

作　　者：吴仁香[1] 陆霞[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：《高分子材料科学与工程》2013年第1期171-174,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51071085)和(50871052);江苏高校优势学科建设工程资助项目

摘　　要：通过溶液浇铸和碱液活化的简易方法制备了聚乙烯醇(PVA)/聚丙烯酸钾(PAAK)碱性聚合物电解质。运用交流阻抗法、循环伏安(CV)和X射线衍射(XRD)等技术对碱性聚合物电解质进行表征,分析了PAAK对聚合物电解质离子电导率的影响。结果表明,PAAK对聚合物电解质导电性的作用主要表现在:一是使聚合物电解质中容纳更多的KOH溶液;二是能降低PVA的结晶度,从而提高聚合物电解质的离子电导率。所制备的PVA/PAAK碱性聚合物电解质最大室温电导率达3.074×10-2S/cm,电化学稳定窗口为2.2 V。以其实验室制备的镁基储氢合金为负极,组装的聚合物镍氢电池(MH-Ni电池)的循环寿命较传统的MH-Ni电池明显改善。Poly （ vinyl alcohol ）/： potassium polyacrylate poly （ acrylic acid ） （ PVA/PAAK ） alkaline polymer electrolyte were prepared by solution casting method and alkaline solution activating. The alkaline polymer electrolyte were characterized by alternating current （AC） impedance method, cyclic voltammetry （CV） and XRD. The influence of PAAK on the ionic conductivity of polymer electrolyte was analyzed. The results indicate that PAA_K can make the polymer electrolyte system containing more KOH solution. On the other hand, the addition of PAAK decreases the crystallinity of PVA, and the results to the improvement of ionic conductivity of polymer electrolyte. The PVA/PAAK alkaline polymer electrolyte exhibits a good electrochemical performance with a highest ionic conductivity of 3.074×10-2 S/cm at ambient temperature and electrochemical stable window of 2.2 V. Polymer metal hydride （MH）-Ni battery was assembled successfully using the PVA/PAAK alkaline polymer electrolyte and Mg-based hydrogen storage alloy as the negative electrode. It is shown that the polymer MH-Ni battery has a better cycle life than the conventional MH-Ni battery.

关 键 词：碱性聚合物电解质 聚乙烯醇 聚丙烯酸钾 离子电导率 聚合物镍氢电池 

分 类 号：TM912.9[电气工程—电力电子与电力传动]