静电纺丝与静电喷雾技术共纺制备PPESK/PVDF复合锂电池隔膜

doi:10.11868/j.issn.1001-4381.2017.000934

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摘要

为了改善传统静电纺丝无纺布纤维膜力学性能较差的缺点，采用静电纺丝和静电喷雾技术相结合的方法，同时进行静电纺PPESK浓溶液和PVDF稀溶液，制备得到PPESK纤维/PVDF珠粒复合锂电池隔膜，并在160℃进行热压后处理。通过扫描电子显微镜、万能拉伸试验机、电化学工作站及充放电测试仪等表征复合锂电池隔膜的微观结构、力学性能、离子电导率和相应的电池充放电性能。结果表明，该复合隔膜具有良好的电解液润湿性，室温下离子电导率达到1.92mS·cm^-1，PVDF珠粒均匀地分布在PPESK纤维中，珠粒经热压产生微熔融有效增强了纤维之间的黏结力，使复合膜的力学强度提高到13.2MPa。此外，使用复合隔膜装配的电池展现出较高的放电比容量和稳定的循环性能。

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	龚文正
	周晶晶
	阮诗伦
	申长雨

关键词 ：静电纺丝, 静电喷雾, 聚芳醚砜酮, 隔膜, 力学性能

Abstract：

In order to improve the mechanical property of traditional electrospinning fibrous membranes, PPESK-fiber/PVDF-bead composite membranes were prepared via simultaneously electrospinning of PPESK concentrated solution and electrospraying of PVDF dilute solution, and then hot pressed at 160℃. The membrane structure, tensile strength, ionic conductivity and cycling performance of lithium-ion batteries were measured by scanning electron microscope, universal tensile test machine, electrochemical work station and battery cycle system. The results show that the hot-pressed PPESK/PVDF composite membrane separator exhibits excellent liquid electrolyte wettability, ionic conductivity reaches 1.92mS·cm^-1 at room temperature, PVDF beads are uniformly dispersed in PPESK fibers. The interfacial strength of PPESK fibers is effectively enhanced due to the melt of PVDF beads during the hot press process, hence the mechanical strength of composite membrane is leached 13.2MPa. In addition, cells assembled with PPESK/PVDF composite membrane show high discharge capacity and stable cycling performances.

Key words： electrospinning electrospraying poly(phthalazinone ether sulfone ketone) membrane separator mechanical property

收稿日期: 2017-07-23 出版日期: 2018-03-20

中图分类号:

TQ326.5

基金资助:国家自然科学基金重点项目(11432003)

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, 周晶晶, 阮诗伦, 申长雨. 静电纺丝与静电喷雾技术共纺制备PPESK/PVDF复合锂电池隔膜[J]. 材料工程, 2018, 46(3): 1-6.
Wen-zheng GONG, Jing-jing ZHOU, Shi-lun RUAN, Chang-yu SHEN. PPESK/PVDF Lithium-ion Battery Composite Separators Fabricated by Combination of Electrospinning and Electrospraying Techniques. Journal of Materials Engineering, 2018, 46(3): 1-6.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2017.000934 或 http://jme.biam.ac.cn/CN/Y2018/V46/I3/1

Fig.1 静电纺PPESK/PVDF复合膜热压前(a)后(b)扫描电镜图像

Table 1 不同隔膜物理性能

Fig.2 真空烘箱150℃条件下Celgard 2400 PP隔膜热处理1h前(a)、后(b)和热压PPESK/PVDF复合膜热处理1h前(c)、后(d)的形态图

Fig.3 热处理前后的PPESK/PVDF复合膜应力-应变曲线

Fig.4 Celgard 2400 PP膜和热压前后的PPESK/PVDF复合膜电化学阻抗谱图

Fig.5 PP隔膜、热处理前后的PPESK/PVDF复合膜组装电池相应尼奎斯特曲线

Fig.6 Celgard 2400 PP膜与热压处理的PPESK/PVDF复合膜装配扣式锂电池在0.2C倍率下放电比容量曲线和库伦效率曲线

Fig.7 Celgard 2400 PP膜与热压处理的PPESK/PVDF复合膜装配扣式锂电池在不同倍率下放电比容量-循环次数曲线

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