文章摘要
熔融静电纺β-PVDF超细纤维隔膜的制备及性能
Preparation and Characterization of Melt Electrospinning β-PVDF Microfiber Separator
  
DOI:10.16865/j.cnki.1000-7555.2018.03.026
中文关键词: 锂离子电池隔膜  熔融静电纺  聚偏氟乙烯  电化学性能
英文关键词: lithium ion battery separator  melt electrospinning  polyvinylidene fluoride  electrochemical performance
基金项目:中国博士后科学基金(2016M601715);中国博士后科学基金特别资助基金;江苏省博士后科研资助计划(1601006A);江苏省社会发展项目(BE2016707)
作者单位
宁景霞,李 柯,肖 阳,魏取福,黄锋林 江南大学 生态纺织教育部重点实验室,江苏 无锡 214122 
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中文摘要:
      以熔融静电纺丝法制备锂离子电池用聚偏氟乙烯(PVDF)多孔超细纤维隔膜。对隔膜的物理性能、电化学性能以及组装电池性能等进行了测试分析。在静电场和温度的协同作用下,能够生成β相PVDF,促进电解质中锂盐的离子化。与商业隔膜Celgard2400进行对比,熔融静电纺PVDF隔膜在130℃下受热0.5h尺寸几乎无变化;孔隙率和吸液率高达83.99%和342.52%,离子电导率可达0.833mS/cm。组装成半电池测试,初始放电比容量可达157.69mA·h/g;0.5C下充放电100次后,容量保持率可达84.68%,优于商业隔膜的75.72%;在不同电流密度下测试,均能保持较稳定的放电比容量。
英文摘要:
      Polyvinylidene fluoride(PVDF) microfiber separator for lithium ion batteries was prepared by melt electrospinning. The physical properties, electrochemical properties and assembly properties of the separator were tested and analyzed. The β phase of PVDF is generated under the synergistic action of electrostatic field and temperature, promoting ionization of lithium salt in the electrolyte. Compared with the commercial separator, the size of melt electrospinning PVDF separator is almost unchanged after been treated at 130 ℃ for 0.5 h; the porosity and absorption rate are 83.99% and 342.52% respecitvely, and the ionic conductivity is 0.833 mS/cm. The capacity of the initial discharge can reach 157.69 mA·h/g; the capacity retention rate is 84.68% after 100 times at a charge/discharge current density of 0.5C, which is better than 84.68% of the commercial separator; test under different current density can maintain a more stable discharge specific capacity.
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