纺织学报 ›› 2018, Vol. 39 ›› Issue (07): 8-14.doi: 10.13475/j.fzxb.20170804207

• 纤维材料 • 上一篇    下一篇

取向增强复合锂离子电池隔膜的制备及其性能

  

  • 收稿日期:2017-08-28 修回日期:2018-04-20 出版日期:2018-07-15 发布日期:2018-07-16

Preparation and properties of orientation reinforced composite separator for lithium-ion battery

  • Received:2017-08-28 Revised:2018-04-20 Online:2018-07-15 Published:2018-07-16

摘要:

为获得纵向拉伸性能优异的静电纺丝锂离子电池隔膜,首先在不同转速条件下制备聚丙烯腈(PAN)纤维膜,分析得出在700 r/min 时,PAN 纤维排列取向性最好。然后将在700 r/min 条件下制备得到的PAN 增强层纤维膜作为中间层,结合上下2 层杂乱分布的聚酯(PET)纤维膜形成取向增强复合隔膜,在低速(100 r/min)条件下制备了PET/PAN/PET 各向同性纤维膜作为对比膜。表征了2 种隔膜的物理力学性能及电化学性能。结果表明:取向增强复合隔膜的吸液率为371%,热收缩率为4.1%,室温下离子电导率为0.553 ms/cm,电化学稳定窗口为5.27 V;由其制备的电池首次放电比容量为138.0 mA?h/g;纵向拉伸断裂强度为9.2 KPa,比对比膜提高了130%,该取向增强复合隔膜机械强度显著提高,综合性能优于PET/PAN/PET 各向同性纤维膜。

关键词: 锂离子电池隔膜, 静电纺丝, 取向纳米纤维膜, 电化学性能

Abstract:

In order to fabricate the electrospinning Lithium-ion battery separator which possessed excellent mechanical properties in lengthways direction, polyacrylonitrile (PAN) membrane were fabricated at different rotational speeds, concluding that the PAN membrane showed best orientation effect at 700 r/min. Then middle-orientation reinforced PAN membrane which was collected at 700 r/min and two layers of disordered polyester (PET) membrane were combined to pripare orientation reinforced compositeseparators.  Meanwhile, isotropous PET/PAN/PET membrane was fabricated at 100 r/min as contrast membrane. The mechanical and electrochemical properties were evaluated. The results show that the electrolyte uptake is 371%, and the thermal shrinkage is 4.1%. The ionic conductivity at room tempertature reaches 0.553 mS/cm and electrochemical stability was 5.27 V. The initial discharge capacity of battery is 138.2 mA?h/g. The breaking strength of the orientation reinforced composite separators is 9.2 MPa in lengthways direction, which is 130% higher than contrast membrane. The mechanical strength of the orientation reinforced composite separator increases observably, and its overall properties are superior to isotropous PET/PAN/PET membranes.

Key words: Iithium-ion baery separator, electrospinning, oriented nanofibrous membrane,  electrochemical property

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