物理化学学报 >> 2007, Vol. 23 >> Issue (12): 1932-1936.doi: 10.3866/PKU.WHXB20071219

研究论文 上一篇    下一篇

辐照交联法制备锂离子电池用凝胶聚合物电解质及其性能

宋兆爽; 其鲁; 邱景义; 马建伟   

  1. 北京大学化学与分子工程学院, 北京 100871
  • 收稿日期:2007-09-17 修回日期:2007-10-10 发布日期:2007-11-30
  • 通讯作者: 其鲁 E-mail:qilu@pku.edu.cn

Preparation and Characterization of γ-Ray Irradiated Gel Polymer Electrolyte for Lithium-Ion Polymer Batteries

SONG Zhao-Shuang; QI Lu; QIU Jing-Yi; MA Jian-Wei   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2007-09-17 Revised:2007-10-10 Published:2007-11-30
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

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摘要： 采用γ-射线辐照交联法制备了具有网络结构的聚偏氟乙烯-六氟丙烯/新戊二醇二丙烯酸酯(PVDF-HFP/NPGDA)基凝胶聚合物电解质(GPE). 考察了不同辐照剂量对凝胶电解质形貌结构、热稳定性和电化学性能的影响以及不同辐照剂量和不同温度下电导率的变化. 结果表明, 随辐照剂量的增加, 凝胶电解质的固化程度提高, 电导率下降. 电导率随温度的变化符合VTF方程. 当辐照剂量为5 kGy 时, 制备的凝胶电解质具有较高的离子电导率和电化学稳定窗口, 室温下分别为7.8×10-3 S·cm-1和4.7 V(vs Li/Li+). 以其为电解质制备的LiMn2O4∣GPE∣Li聚合物锂离子电池具有较好的循环性能.

关键词: 凝胶态聚合物电解质, γ-射线辐照, 交联网络结构, VTF方程

Abstract: The gel polymer electrolyte (GPE) based on PVDF-HFP and NPGDA network was prepared via γ-ray irradiation method. The structure, thermal stability and electrochemical performace of the GPE effected by irratiation dose were examined. The relationship between ionic conductivity and temperature followed Vogel-Tamman-Fulcher (VTF) equation, which suggested amorphous regions being dominant in GPE. The GPE irradiated at 5 kGy exhibited electrochemical stability up to 4.7 V vs Li/Li+ and high conductivity of 7.8×10-3 S·cm-1 at 25 ℃. In situ prepared LiMn2O4∣GPE∣Li cells exhibited good cycle performance, which provided a new approach to the fabrication of lithium-ion polymer batteries (LiPBs).

Key words: Gel polymer electrolyte, γ-ray irradiation, Cross-linking network, VTF equation