红外光谱研究PEO基离子液体聚合物电解质  

FTIR Spectroscopic Studies of PEO-based Polymer Electrolyte with Ionic Liquid

作　　者：金兰英[1] 姜艳霞[1] 廖宏刚[1] 曾冬梅[1] 孙世刚[1] 

机构地区：[1]固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系,厦门361005

出　　处：《高等学校化学学报》2009年第4期767-771,共5页Chemical Journal of Chinese Universities

基　　金：国家"九七三"计划(批准号:2002CB211804);国家自然科学基金(批准号:20433040;20573085)资助

摘　　要：以聚氧化乙烯(PEO)为聚合物基体,双三氟甲基磺酸亚酰胺锂(L iTFSI)为锂盐,加入不同量的离子液体(BM IMPF6)为增塑剂,制备离子液体聚合物电解质.运用发射FTIR光谱技术实时监测所制备聚合物电解质的结构随温度的变化.结合FTIR透射光谱、SEM和XRD的研究结果分析了离子液体对离子电导率的影响,并初步提出离子导电增强机制.Polymer electrolytes based on poly（ ethylene oxide） （PEO） was prepared using LiTFSI as lithium salt and doping with 1-butyl-3-methylimidazolium hexaflurophosphate（ BMIMPF6 ） by solution casting method. The addition of BMIMPF6 resulted in an increase of the ionic conductivity. When the amount of the ionic liquid is 40% , the ionic conductivity could reach 1.80 ×10^-4 S/cm at 40℃. The samples were explored by emission FTIR spectroscopy at elevated temperatures, phase on temperature. Based on results of SEM, XRD which illustrated the dependence of crystalline PEO , transmission FTIR and emission FTIR, the effect of ionic liquid on the ionic conductivity was analyzed. It was revealed that the ionic liquid decreased cystallinity of the polymer, and resulted in the increase of ionic conductivity. The study has demonstrated that the FTIR spectroscopy is an important method for investigations of lithium batteries.

关 键 词：FTIR光谱 聚合物电解质 聚氧化乙烯 双三氟甲基磺酸亚酰胺锂 离子液体 

分 类 号：O646[理学—物理化学]