储能科学与技术

• 研究开发 • 上一篇    

不同温度对PVDF-HFP基多孔聚合物电解质膜的孔结构及性能的影响

陈淑花1，刘学武2*，冯铁柱2，王晓娟2   

  1. 1.大连大学 环境与化学工程学院，辽宁，大连，116622；2.大连理工大学 化工机械与安全学院，辽宁，大连，116023）
  • 收稿日期:2016-11-25 修回日期:2017-01-17 出版日期:2017-02-09 发布日期:2017-02-09
  • 通讯作者: 刘学武，大连理工大学，博士，副教授，研究方向为功能材料制备，E-mail:liuxuewu@dlut.edu.cn .
  • 基金资助:
    国家自然科学基金资助（21376035, 21106010）

Effects of Temperature on Structure and Properties of PVDF-HFP-Based Porous Polymer Electrolyte Membranes Prepared by Non-Solvent Evaporate Method
 

CHEN Shuhua1, LIU Xuewu2* , FENG Tiezhu2, Wang Xiaojuan2   

  1. 1. College of Environmental and Chemical Engineering, Dalian University, Dalian 116622; 2. School of chemical machinery and safety, Dalian University of Technology, Dalian 116024
  • Received:2016-11-25 Revised:2017-01-17 Online:2017-02-09 Published:2017-02-09

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摘要： 采用非溶剂挥发法制备了锂离子电池聚偏氟乙烯-六氟丙烯（PVDF-HFP）基多孔聚合物电解质膜，研究了非溶剂乙二醇不同温度下挥发对多孔聚合物电解质膜的孔结构及性能的影响。用扫描电子显微镜（SEM）、差示扫描量热法（DSC）、拉伸测试和交流阻抗法等测试手段分别对制备的聚合物电解质膜的微观形貌、结晶度、机械强度和室温离子电导率进行表征。结果表明：非溶剂乙二醇挥发温度对多孔聚合物电解质膜的物理和电化学性能影响显著；温度较低时，无法成膜；温度较高时，膜截面呈蜂窝状的大孔结构；当温度从60℃升至100℃，拉伸强度从6.49MPa增至21.39MPa，室温离子电导率从1.07mS/cm降至0.14mS/cm。综合分析，非溶剂挥发法制备PVDF-HFP基多孔聚合物电解质膜时，非溶剂乙二醇挥发温度选在70℃与90℃之间较为合适。

关键词: 锂离子电池, 聚合物电解质, 非溶剂挥发法, 温度, PVDF-HFP

Abstract:  In this study, PVDF-HFP-based porous polymer electrolyte membranes for lithium-ion battery have been prepared by non-solvent evaporate method, and the effects of different volatility temperature ethylene glycol on the structure and properties of porous polymer electrolyte membranes were examined. The membranes were characterized by scanning electron microscopy (SEM), different scanning calorimetry (DSC), mechanical strength test, electrochemical impedance spectroscopy (EIS). The results show that volatility temperature ethylene glycol has significant influences on the physical and electrochemical properties of porous polymer electrolyte membranes. It is found that the membrane with good appearance cannot be obtained lower temperature. The membranes showed honeycomb-like macroporous morphology on the cross-section with higher temperature. When temperature increased from 60 to 100 oC, the tensile strength increased from 6.49 to 21.39 MPa, and the ionic conductivity at room temperature decreased from 1.07 to 0.14 mS/cm. So with volatility temperature ethylene glycol of 70~90 oC, it is more suitable for preparing PVDF-HFP porous electrolyte membranes via non-solvent evaporate method.

Key words: lithium-ion battery, polymer electrolyte, non-solvent evaporate method, PVDF-HFP, drying temperature