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材料工程  2019, Vol. 47 Issue (9): 116-122    DOI: 10.11868/j.issn.1001-4381.2018.000734
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
POSS-(PMMA46)8浸渍涂覆商业PP隔膜的结构与性能
马敬玉, 杨凯淇, 张敏, 杨晗, 马晓燕
西北工业大学 理学院, 西安 710129
Structure and properties of POSS-(PMMA46)8 impregnated commercial polypropylene separator
MA Jing-yu, YANG Kai-qi, ZHANG Min, YANG Han, MA Xiao-yan
School of Science, Northwestern Polytechnical University, Xi'an 710129, China
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摘要 为了提高锂离子电池的安全性能,降低其界面阻抗,选用既具有优异耐热性能又与聚合物有良好相容性的POSS杂化聚甲基丙烯酸甲酯(POSS-(PMMA468)作为改性剂,通过在商业聚丙烯(PP)隔膜上浸渍POSS-(PMMA468制备改性商用PP隔膜,分析隔膜的力学性能、热收缩性能、界面性能、离子电导率及电化学性能。结果表明:当POSS-(PMMA468质量分数为40%时,复合膜的孔丰富均一,润湿性最佳,拉伸强度是未改性前的5.34倍,且在160℃/1h下具有较高的热稳定性。此复合膜电导率为1.35×10-3 S/cm,与电极的界面阻抗由原来的743Ω降为152Ω;Li/改性隔膜/LiFePO4扣式电池的充放电循环稳定性较好,低倍率下的电池容量与商业PP隔膜相当。
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马敬玉
杨凯淇
张敏
杨晗
马晓燕
关键词 锂离子电池浸渍POSS-(PMMA46)8热稳定性隔膜    
Abstract:In order to improve the safety and reduce interface impedance of lithium-ion batteries, the star-shaped polyhedral POSS-poly(methyl methacrylate) (POSS-(PMMA46)8), which has both excellent heat resistance and good compatibility with the polymer material, was selected as a modifier to modify the separator of commercial polypropylene (PP) by the method of impregnation. The micromorphology of the composite separator was studied by scanning electron microscope (SEM). The mechanical property of the separator was measured by a tensile tester. The thermal stability of the separator was studied at a high temperature. The wettability of the separator was tested by a contact angle tester. The AC impedance was used to obtain the bulk impedance of the composite separator and then its ionic conductivity was studied. The electrochemical stability of the separator was measured by linear sweep voltammetry (LSV). The results show that when the mass fraction of POSS-(PMMA46)8 is 40%, the pore distribution of the composite membrane is homogeneous, and the wettability is the best. The tensile strength is 5.34 times that of the original film, and the thermo-stability is ideal at 160℃/1h. The conductivity of the composite membrane is 1.35×10-3 S/cm. The interface resistance between the composite separator and the electrode is reduced from 743Ω to 152Ω, and which is 79.5% higher than that of the original film; for Li/Separator/LiFePO4 cell, the charge-discharge cycling stability is better and the battery capacity at low magnification is comparable to commercial PP separator.
Key wordsLi-ion battery    impregnation    POSS-(PMMA46)8    thermal stability    separator
收稿日期: 2018-06-21      出版日期: 2019-09-18
中图分类号:  TM912  
基金资助: 
通讯作者: 马晓燕(1963-),女,教授,博士,研究方向为新化学电源的设计及新化学电源材料的设计与合成,有机/无机杂化材料和高性能树脂及其纳米复合材料研究,E-mail:m_xiao_yana@nwpu.edu.cn     E-mail: m_xiao_yana@nwpu.edu.cn
引用本文:   
马敬玉, 杨凯淇, 张敏, 杨晗, 马晓燕. POSS-(PMMA46)8浸渍涂覆商业PP隔膜的结构与性能[J]. 材料工程, 2019, 47(9): 116-122.
MA Jing-yu, YANG Kai-qi, ZHANG Min, YANG Han, MA Xiao-yan. Structure and properties of POSS-(PMMA46)8 impregnated commercial polypropylene separator. Journal of Materials Engineering, 2019, 47(9): 116-122.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000734      或      http://jme.biam.ac.cn/CN/Y2019/V47/I9/116
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