静电纺丝聚芳醚砜酮纤维膜穿刺强度研究

doi:10.11868/j.issn.1001-4381.2017.001234

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摘要

静电纺丝纤维膜因为具有高孔隙率、大的比表面积和良好的电解液润湿性而被广泛地应用于锂离子电池隔膜的研究，但对于锂离子电池安全性能至关重要的隔膜穿刺强度的研究还比较匮乏。本工作采用静电纺丝技术制备得到PPESK纤维膜，并采用热处理提高纤维膜的力学性能，然后通过穿刺实验测得一系列不同厚度热处理PPESK纤维膜的穿刺强度，并建立起穿刺强度与纤维膜厚度之间的线性关系。通过对穿刺破坏区域的微观分析，探究热处理PPESK纤维膜穿刺破坏机理，结果表明：各向同性的热处理PPESK纤维膜穿刺过程是由纤维受挤压产生弯曲、变形和断裂造成的破坏，破坏区域呈近似圆形穿刺孔，而PP微孔膜的破坏区域则是由脆性断裂造成的长条形裂缝，相比之下热处理PPESK纤维膜的穿刺破坏过程更加缓和，可以降低锂枝晶刺穿隔膜带来的风险，但是热处理PPESK纤维膜的穿刺强度还有待增强。

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	龚文正
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关键词 ：静电纺丝, 纤维膜, 穿刺强度, 聚芳醚砜酮

Abstract：

Electrospun fibrous membranes have been widely used for research of lithium-ion battery separators because of the high porosity, large specific surface area as well as excellent electrolyte wettability. However, little research has been focused on the puncture strength, which influences the safety of lithium-ion battery seriously. PPESK fibrous membranes with different thicknesses were fabricated by electrospinning technique, and the mechanical properties were improved by heat treatment, and the puncture strength of heat-treated PPESK membrane was tested using universal tensile testing machine and the linear relationship between the puncture strength of heat-treated PPESK fibrous membrane and the thickness was established. The further microscopic analysis of the puncture failure region was carried out to explore the puncture failure mechanism of heat-treated PPESK fibrous membranes. The result shows that the puncture process of isotropic heat-treated PPESK fibrous membrane is much tempered compared with PP microporous separator. The penetration of the heat-treated PPESK fibrous membranes was caused by the bend, deformation and fracture of PPESK fibers. The failure region of heat-treated PPESK fibrous membrane appears a circular hole, while the PP separator is long cracks. The puncture mechanism of heat-treated PPESK fibrous membrane is beneficial to prevent the destruction of lithium dendrites, but the puncture strength of heat-treated PPESK fibrous membrane remains to be enhanced.

Key words： electrospinning fibrous membrane puncture strength poly(phthalazinone ether sulfone ketone)

收稿日期: 2017-10-01 出版日期: 2019-04-19

中图分类号:

TQ326.5

基金资助:国家自然科学基金重点项目(11432003);高等学校学科创新引智计划(B14013)

通讯作者: 阮诗伦 E-mail: ruansl@dlut.edu.cn

作者简介: 阮诗伦(1976-), 男, 副教授, 博士, 研究方向为纳米高分子复合材料的制备、力学行为及增强机理, 联系地址:辽宁省大连市甘井子区凌工路2号大连理工大学工程力学系(116024), E-mail:ruansl@dlut.edu.cn

引用本文:

龚文正, 常保宁, 阮诗伦, 申长雨. 静电纺丝聚芳醚砜酮纤维膜穿刺强度研究[J]. 材料工程, 2019, 47(4): 32-38.
Wen-zheng GONG, Bao-ning CHANG, Shi-lun RUAN, Chang-yu SHEN. Puncture strength research of electrospun PPESK fibrous membrane. Journal of Materials Engineering, 2019, 47(4): 32-38.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.001234 或 http://jme.biam.ac.cn/CN/Y2019/V47/I4/32

Fig.1 静电纺丝原理示意图

Fig.2 穿刺实验夹具(a)，(b)和穿刺针(c)

Fig.3 静电纺丝PPESK纤维膜热处理前(a)、后(b)和PP微孔膜(c)的扫描电镜图像

Fig.4 静电纺丝PPESK纤维膜热处理前后的应力-应变曲线

Fig.5 热处理PPESK纤维膜穿刺前后(a)，(b)和PP微孔膜穿刺前后(c)，(d)的实验图

Fig.6 几种不同厚度的热处理PPESK纤维膜和PP微孔膜穿刺力-位移曲线

Fig.7 热处理PPESK纤维膜穿刺强度随厚度的变化及其线性拟合

Fig.8 热处理PPESK纤维膜(a)，(b)和PP微孔膜(c)，(d)穿刺孔区域SEM图像

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