文章摘要
静电纺丝法制备POSS-(C3H6Cl)8复合聚偏氟乙烯聚合物隔膜的结构与性能
Structure and Property of Electrospinning POSS-(C3H6Cl)8 Composite Polyvinylidene Fluoride Separators
  
DOI:10.16865/j.cnki.1000-7555.2018.06.009
中文关键词: 八氯丙基POSS  聚偏氟乙烯  静电纺丝  锂离子电池
英文关键词: POSS-(C3H6Cl)8  polyvinylidene fluoride  electrospinning  Li-ion battery
基金项目:陕西省自然科学基金资助项目(2013JQ2010, 2013JM2012);陕西省科技统筹创新工程计划(2016KTZDGY10-01)
作者单位
马敬玉, 孙 坤, 马晓燕, 陈 芳, 刘 依, 杨凯淇 西北工业大学 理学院陕西 西安 710129 
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中文摘要:
      为了提高锂离子电池的安全性,文中选择聚偏氟乙烯(PVDF)为聚合物基体,八氯丙基低聚倍半硅氧烷(POSS-(C3H6Cl)8)为改性剂,通过静电纺丝法制备POSS-(C3H6Cl)8复合PVDF聚合物隔膜(EPS)。表征了纺丝膜的形貌、力学性能,测试了电化学窗口和Li/LiFePO4纽扣电池的充放电循环稳定性。结果表明,当POSS-(C3H6Cl)8的加入量为10%时,静电纺丝纤维薄膜的拉伸强度和断裂伸长率分别比纯PVDF提高了106.4%和27.2%;室温下的离子传导率为3.8×10-3 S/cm,比纯PVDF提高了97.4%;电化学稳定窗口为5.7 V。用该聚合物隔膜组装的锂离子电池具有良好的循环稳定性和倍率性能。
英文摘要:
      To improve the safety of Li-ion batteries, the polyvinylidene fluoride (PVDF) membrane containing octa chloropropyl polyhedral oligomeric silsesquioxane (POSS-(C3H6Cl)8) was prepared by electrospinning technique. The morphology and mechanical property of electrospun polymer separators (EPSs) were analyzed at first, then the electrochemical window and the charge/discharge cycle stability of Li/LiFePO4 cells were tested. Results show that the electrospun polymer separators have the preferable performance when the content of POSS-(C3H6Cl)8 is 10%. Under this condition, the fibers are very uniform and have better morphology. The tensile strength and broken elongation are increased by 106.4% and 27.2%, respectively. The ionic conductivity is 3.8×10-3 S/cm at room temperature, which is improved by 97.4% than that of pure PVDF separator. The electrochemical stability window of polymer film is 5.7 V. The Li-ion batteries assembled with EPSs have superior cycle stability and rate capability.
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