物理化学学报 >> 2005, Vol. 21 >> Issue (11): 1263-1268.doi: 10.3866/PKU.WHXB20051114

研究论文 上一篇    下一篇

一种新型凝胶态聚合物电解质的制备和性能

唐定国; 刘建红; 慈云祥; 其鲁   

  1. 北京大学化学与分子工程学院, 北京 100871； 中信国安盟固利电源技术有限公司, 北京 102200
  • 收稿日期:2005-04-26 修回日期:2005-06-14 发布日期:2005-11-15
  • 通讯作者: 其鲁 E-mail:qilu@pku.edu.cn

Preparation and Performances of a Novel Gel Polymer Electrolyte

TANG Ding-guo; LIU Jian-hong; CI Yun-xiang; QI Lu   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871; CITIC Guo’an Mengguli Power Source Technology Company, Limited, Beijing 102200
  • Received:2005-04-26 Revised:2005-06-14 Published:2005-11-15
  • Contact: QI Lu E-mail:qilu@pku.edu.cn

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摘要： 采用一种新型胶联剂新戊二醇二丙烯酸酯(noepentyl glycol diacrylate, NPGDA)和聚偏氟乙烯-六氟丙烯(poly(vinylidene fluoride-co-hexafluoropropylene), PVDF-HFP), 液态电解液组成电解质混合溶液, 然后加入引发剂并加热引发聚合反应制备了一种具有互穿聚合物网络结构的凝胶态聚合物电解质, 可以用于制备聚合物锂离子二次电池. 考察了不同PVDF-HFP/NPGDA质量比对凝胶态聚合物电解质性能的影响. 结果表明, PVDF-HFP/NPGDA质量比可以影响凝胶态聚合物电解质的结构形貌、电化学特性以及聚合物锂离子二次电池的性能. 研究发现, 当m(PVDF-HFP)/m(NPGDA)＝1:1时制备的凝胶态聚合物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6.99×10-3 S•cm-1和4.8 V(vs Li+/Li), 以其为电解质制备的聚合物锂离子二次电池具有较好的电化学性能.

关键词: 凝胶态聚合物电解质, 新戊二醇二丙烯酸酯, 互穿聚合物网络, 热聚合, 聚合物锂离子二次电池

Abstract: A novel gel polymer electrolyte (GPE) based on noepentyl glycol diacrylate (NPGDA) and poly(vinyli-dene fluofide-co-hexafluoropropylenen) (PVDF-HFP) was prepared by a thermal polymerization method. GPE with a stable interpenetrating polymer network (IPN) structure was used to assemble polymer lithium-ion batteries. The influence of PVDF-HFP/NPGDA mass ratios on the characteristics of GPE was studied by scanning electron microscopy, linear sweep voltammetry and electrochemical impedance spectroscopy. The results show that PVDF-HFP/NPGDA mass ratio greatly affects the performances of GPE, such as surface morphology and ionic conductivity. When the mass ratio between PVDF-HFP and NPGDA is 1:1, GPE boasts a high ionic conductivity of 6.99×10-3 S•cm-1 and an electrochemical stability window of 4.8 V(vs Li+/Li) at 25 ℃. The polymer lithium-ion batteries based on GPE also present excellent performances, such as high rate capability and discharge voltage plateau, good temperature reliability, and excellent cycling.

Key words: Gel polymer electrolyte, Noepentyl glycol diacrylate, Interpenetrating polymer network, Thermal polymerization, Polymer lithium-ion batteries