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辐照改性聚丙烯腈/热塑性聚氨酯锂离子电池隔膜的制备与性能

王一迪 巩桂芬 崔巍巍 王召阳 楼晨霞

王一迪, 巩桂芬, 崔巍巍, 等. 辐照改性聚丙烯腈/热塑性聚氨酯锂离子电池隔膜的制备与性能[J]. 复合材料学报, 2024, 41(5): 2385-2394. doi: 10.13801/j.cnki.fhclxb.20230920.004
引用本文: 王一迪, 巩桂芬, 崔巍巍, 等. 辐照改性聚丙烯腈/热塑性聚氨酯锂离子电池隔膜的制备与性能[J]. 复合材料学报, 2024, 41(5): 2385-2394. doi: 10.13801/j.cnki.fhclxb.20230920.004
WANG Yidi, GONG Guifen, CUI Weiwei, et al. Preparation and properties of irradiated modified polyacrylonitrile/thermoplastic polyurethane lithium-ion battery separator[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2385-2394. doi: 10.13801/j.cnki.fhclxb.20230920.004
Citation: WANG Yidi, GONG Guifen, CUI Weiwei, et al. Preparation and properties of irradiated modified polyacrylonitrile/thermoplastic polyurethane lithium-ion battery separator[J]. Acta Materiae Compositae Sinica, 2024, 41(5): 2385-2394. doi: 10.13801/j.cnki.fhclxb.20230920.004

辐照改性聚丙烯腈/热塑性聚氨酯锂离子电池隔膜的制备与性能

doi: 10.13801/j.cnki.fhclxb.20230920.004
基金项目: 国家自然科学基金(51603057)
详细信息
    通讯作者:

    巩桂芬,博士,教授,硕士生导师,研究方向为锂离子电池隔膜材料、保温复合材料 E-mail:ggf-hust@163.com

  • 中图分类号: TB332;TQ619.6

Preparation and properties of irradiated modified polyacrylonitrile/thermoplastic polyurethane lithium-ion battery separator

Funds: National Natural Science Foundation of China (51603057)
  • 摘要: 聚丙烯腈(PAN)隔膜具有优秀的电化学性能,作为锂离子电池隔膜材料受到广泛关注,但其机械强度与耐热性不足问题依然存在。本文选用由软段与硬段构成的聚合物热塑性聚氨酯(TPU)与PAN进行混纺,并将制备的纤维膜通过60Co γ 射线对其改性,制备出一种新型锂离子电池隔膜。通过FTIR发现辐照改性PAN/TPU隔膜,PAN分子间出现环化反应,并且PAN与TPU分子间出现C=N—N键的交联,环和交联结构的引入都提高隔膜的力学与耐热性能,此外通过100 kGy改性后的隔膜电化学性能优异,具有较高的吸液率(552%)与孔隙率(68.2%),电化学稳定窗口为5.42 V,界面阻抗为149.44 Ω,离子电导率为1.68×10−3 S/cm,均优于辐照前的隔膜,1 C下循环100次后放电容量保持率为96.53%,并在循环测试中表现出优异的倍率性能。

     

  • 图  1  聚丙烯腈/热塑性聚氨酯(PAN/TPU)复合隔膜工艺流程与辐照原理

    DMF—N, N-dimethylformamide

    Figure  1.  Polyacrylonitrile/thermoplastic polyurethane (PAN/TPU) composite separators process flow chart and irradiation schematic

    图  2  不同辐照剂量下的PAN/TPU纤维复合隔膜的SEM图像:(a) 0 kGy;(b) 50 kGy;(c) 100 kGy;(d) 150 kGy;((e), (f)) 200 kGy

    Figure  2.  SEM images of PAN/TPU fiber composite separators at different radiation doses: (a) 0 kGy; (b) 50 kGy; (c) 100 kGy; (d) 150 kGy; ((e), (f)) 200 kGy

    图  3  不同辐照剂量下PAN/TPU纤维复合隔膜的FTIR图谱(a)和XRD图谱(b)

    Figure  3.  FTIR spectra (a) and XRD patterns (b) of PAN/TPU fibercomposite separators at different radiation doses

    图  4  PAN/TPU纤维复合隔膜的力学性能对比

    Figure  4.  Comparison of mechanical properties for PAN/TPU fiber composite separators

    图  5  不同隔膜的吸液率与孔隙率(a)和接触角(b)对比

    PP—Polypropylene

    Figure  5.  Comparison of liquid absorption and porosity (a) and contact angle (b) for different separators

    图  6  不同隔膜的TGA曲线(a)和热收缩图片(b)

    Figure  6.  TGA curves (a) and heat shrink images (b) for different separators

    图  7  不同隔膜的电化学性能对比

    Figure  7.  Comparison of electrochemical properties of different separators

    图  8  不同隔膜的界面阻抗

    Figure  8.  Interfacial impedance of different separators

    图  9  不同隔膜的交流阻抗图

    Figure  9.  AC impedance maps of different separators

    图  10  不同隔膜的循环性能曲线

    Figure  10.  Cyclic performance curves of different separators

    图  11  不同隔膜的倍率性能曲线

    Figure  11.  Magnanimity performance curves of different separators

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出版历程
  • 收稿日期:  2023-07-20
  • 修回日期:  2023-08-14
  • 录用日期:  2023-09-12
  • 网络出版日期:  2023-09-20
  • 刊出日期:  2024-05-01

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