三(甲氧基聚乙二醇)-铝酯锂离子电池聚合物电解质的制备与研究

Study and fabrication of lithium ion batteries using tris( methoxypolyethyleneglycol) aluminate esters as plasticizer for polymer electrolyte

以甲氧基聚乙二醇甲基丙烯酸酯(MPEGM)和十六烷基聚乙二醇甲基丙烯酸酯(HPEGM)为单体,三(甲氧基聚乙二醇)-铝酯(MPEG-Al酯)为增塑剂,锂盐为高氯酸锂(LiClO4),采用自由基溶液聚合法制备了聚合物电解质P(MPEGM-HPEGM)/MPEG-Al。用红外光谱(FT-IR)、差热分析(DSC)和交流阻抗等方法对聚合物及电解质的结构与性能进行了研究。测试结果表明,MPEGM和HPEGM共聚生成P(MPEGM-coHPEGM);聚合物中聚氧化乙烯(PEO)链段的运动能力得到提高,有利于离子传输;聚合物电解质膜具有优良的热稳定性和电化学稳定性;以MPEG7-Al为增塑剂,当m(MPEGM)∶m(HPEGM)∶m(MPEG7-Al)=4∶1∶5,n(Li+)∶n(EO)=1∶20时,30℃下,聚合物电解质的离子电导率最高达到0.43×10-3S/cm;离子迁移数达到0.3;电化学窗口为4.8V。

A novel comb like copolymer electrolyte was designed by co-polymerizing of two macro monomers： methoxy-poly（ethylene glycol） methacrylate （MPEGM） and hexadecal-poly （ethylene glycol） methacrylate （HPEGM）, tris （methoxypolyethyleneglycol） aluminate ester （MPEG-A1 ester）, Li-salt （LiClO4）. Perform ances of the polymer electrolytes were studied by FT-IR, DSC and alternating current（AC） impedance and so on. The results showed that P（MPEGM-HPEGM） had been formed and the motion of PEO chains had been im proved. The polymer electrolytes possessed excellent thermal stability and electrochemical stability. And when the weight ratio of MPEGM to HPEGM to MPEGr-A1 ester was 4 ： 1 ： 5, the maximum ionic conductivity val- ue reached 0.43×10^-3S/cm with n（Li＋） ： n（EO）=1 ： 20 at 30℃.