化学学报 ›› 2004, Vol. 62 ›› Issue (4): 377-380. 上一篇    下一篇

研究论文

新型复合聚合物电解质离子导电行为的研究

陈国荣, 史鹏飞, 白永平, 范太炳   

  1. 哈尔滨工业大学应用化学系, 哈尔滨, 150001
  • 收稿日期:2003-05-07 修回日期:2003-10-26 出版日期:2004-02-28 发布日期:2014-01-26
  • 通讯作者: 陈国荣,E-mail:chengr003@hotmail.com E-mail:chengr003@hotmail.com

Study on Ionic Conductivity Behavior of Novel Composite Polymer Electrolytes

CHEN Guo-Rong, SHI Peng-Fei, BAI Yong-Ping, FAN Tai-Bing   

  1. Department of Applied Chemistry, Haerbin Institute of Technology, Haerbin 150001
  • Received:2003-05-07 Revised:2003-10-26 Online:2004-02-28 Published:2014-01-26

PEG600和CH2Cl2通过Williamson缩聚反应,生成主链柔顺的PEG共聚物.1H NMR测试表明其以[CH2O(CH2>CH2O)13]为重复结构单元.与聚合物质量含量8%的气相SiO2及适量的LiN(CF3SO2)2掺杂,制备一系列新型复合聚合物电解质.通过AC阻抗研究离子电导率,提出适合本体系的等效电路.该体系具有良好的成膜性能与热稳定性能,电导率比传统的PEO/盐体系高2~3个数量级.离子电导率随着温度的升高而增加,低温电导率增加较快,高温电导率增加较慢,呈非Arrhenius变化.在EO/Li=13~34:1(摩尔比)范围内,离子电导率随着盐浓度的变化出现两个峰值,低盐浓度的峰值较高.在303 K, EO/Li=28:1时,最大离子电导率接近10-4 S/cm.

关键词: PEG600, 气相SiO2, 复合聚合物电解质, 离子电导率, 交流阻抗

Poly(ethylene glycol)600 (PEG, Mn=600) and CH2Cl2 were polycondensated to form a soft main chain block polymer. 1H NMR measurement demonstrated that the polymer repeating unit was [CH2O(CH2CH2O)13]. A series of composite polymer electrolytes were prepared by using the polymer with an appreciable amount of LiN(CF3SO2 blended with fumed silica (8wt% of the polymer). The conductivity was studied through measurements of AC impedance spectra, and fitting the resulting equivalent circuits. The processability of the composite polymer electrolytes was improved very much, and its conductivity was 2~3 orders higher than that of pure PEO/Li salt system. The conductivity increased with the increase of temperature. At low temperature area, the conductivity increased dramatically, while it increased slowly at high temperature area and not coincided with Arrhenius formula. Within EO/Li=13~34:1 (molar ratio), the plot of conductivity vs. salt content showed two peaks and the peak value in low salt content was higher. When EO/Li=28:1 at 303 K, the highest ionic conductivity appeared and approached 10-4 S/cm.

Key words: PEG600, fumed SiO2, composition polymer electrolyte, ionic conducuivity, AC impedance