埃洛石纳米管改性聚丙烯腈隔膜的制备及电化学性能研究
首发时间:2020-02-28
摘要:传统锂离子电池聚丙烯隔膜存在离子电导率低、电化学稳定窗口窄以及吸液率低等主要问题,阻碍了锂离子电池在大功率器件中的应用。本文提出了一种以聚丙烯腈作为高分子骨架基体,埃洛石纳米管作为改性填料,通过静电纺丝技术制备出具有纳米孔径的锂离子隔膜。埃洛石纳米管改性聚丙烯腈静电纺丝隔膜不仅增加了隔膜的吸液率(1190%),而且提高了电解质的离子电导率,更提高了电解质的电化学稳定窗口。在组装成锂/电解质/磷酸铁锂电池中,在1C电流下,充放电循环500圈后仍75.8%的容量保持率。
关键词: 锂离子电池 锂离子电池隔膜 聚丙烯腈 静电纺丝 埃洛石纳米管
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Preparation and electrochemical performance of Halloysite Nanotubes modified polyacrylonitrile separator
Abstract:The main problems of traditional polypropylene (PP)separator are low ionic conductivity, low electrochemical window and low saturated electrolyte uptake, which hinder the further development of lithium ion battery. In this paper, lithium ion separator composed of nanometer diameter polymer filaments was prepared by electrostatic spinning with polyacrylonitrile (PAN) as the polymer matrix and Halloysite Nanotubes as the modified filler. Halloysite Nanotubes modified polyacrylonitrile membranes not only increased the separator absorption rate (1190%), but also increased the ionic conductivity and improved the electrochemical stability window. In the lithium/electrolyte/LiFePO4 battery, the capacity retention rate is 75.8% after 500 cycles of charging and discharging at 1C.
Keywords: Lithium ion batteries Separator Polyacrylonitrile Electrospinning technology Halloysite Nanotubes
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埃洛石纳米管改性聚丙烯腈隔膜的制备及电化学性能研究
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