Preparation of High-Strength Polyvinylidene Fluoride Lithium-Ion Battery Separator by Electrospinning

被引：0
|
作者：
Gong W. [1 ]
Gu J. [2 ]
Ruan S. [2 ]
Shen C. [2 ]
机构：
[1] School of Materials Science and Engineering, Dalian University of Technology, Dalian
[2] Department of Engineering Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2019年 / 35卷 / 03期
关键词：
Electrospun; Lithium-ion battery separator; Mechanical property; Polyvinylidene fluoride;
D O I：
10.16865/j.cnki.1000-7555.2019.0087
中图分类号：
学科分类号：
摘要：
Electrospun polyvinylidene fluoride (PVDF) fibrous membranes show large specific areas, high porosities and excellent wettability to liquid electrolytes. But, electrospun PVDF membranes cannot satisfy mechanical properties requirements for lithium-ion battery separators because of the weak interaction between fibers. In this paper, the PVDF fiber orientation was improved by increasing the rotating speed of the electrospinning collecting drum, thus the tensile strength of membranes along the fiber orientation direction increases effectively. And then oriented PVDF membranes were hot pressed under 2 MPa at 160℃ with two pieces of them were overlaid vertically. The novel hot-pressed oriented PVDF membranes show a high tensile strength of 15.6 MPa at the horizontal and vertical directions. The ionic conductivity of liquid electrolyte-soaked hot-pressed oriented PVDF membranes is 1.52 mS/cm. Moreover, compared with Celgard 2400 PP separator, the hot-pressed oriented PVDF membrane exhibits a lower interfacial resistance with lithium electrode. In addition, the cells using hot-pressed oriented PVDF membranes exhibit high discharge capacities and good rate capabilities at the room temperature. © 2019, Editorial Board of Polymer Materials Science & Engineering. All right reserved.
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页码：148 / 155
页数：7
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