Acta Scientiarum Naturalium Universitatis Pekinensis

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Preparation of Polymer Electrolyte Membranes Supported by Non-Woven Fabrics for Lithium-Ion Polymer Batteries

SONG Zhaoshuang, QIU Jingyi, MA Jianwei, Qilu1)
(New Energy Materials and Technology Laboratory,Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871; 1)Corresponding   

  • Received:2006-09-18 Online:2006-12-30 Published:2006-12-30



Abstract: Non-woven fabrics were modified via radiation-induced grafting of styrene (St ) and then immersed in the mixed solution of butanone / PVDF-HFP / butanol to prepare porous composite polymer electrolyte membranes. The obtained composite membranes supported by non-woven fabrics have appropriate thickness and good mechanical strength. Radiation grafting enhances the interaction between non-woven fabrics and PVdF-HFP-based polymer mixtures. Finally, the lithium-ion battery assembled with the obtained membrane was tested, which exhibits higher capability and better cycling performance.

Key words: porous composite polymer electrolyte membrane, non-woven fabrics, radiation-induced grafting, lithium-ion polymer battery

摘要: 采用γ射线辐射接枝的方法在无纺布纤维表面接枝苯乙烯。将接枝改性后的无纺布浸渍于丁酮/PVDF-HFP/丁醇混合液中,真空干燥后制得多孔的无纺布支撑聚合物电解质复合膜。以其为隔膜组装了聚合物锂离子电池(LiMn2O4/无纺布聚合物复合膜/Li),进行充放电测试。研究结果表明,无纺布聚合物复合膜具有合适的厚度,一定的机械强度。辐射接枝提高了无纺布与聚合物混合液的结合力,在电池的充放电循环过程中不易发生短路,电池的容量和循环性能得到显著提高。

关键词: 多孔聚合物复合膜, 无纺布, 辐射接枝, 聚合物锂离子电池

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