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Study on cellulose/nylon6 lithium battery separator modification by polyvinylidene fluoride in ionic liquid [Emim]Ac

Authors： ZHAO Gaojie, SUN Zhonghua, WANG Aiai , NING Ruxia, LIANG Jie

Units： 1. College of Engineering, Qufu Normal University, Rizhao 276826, Shandong; 2. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin, 300457

KeyWords： Separator; Ionic liquid; PVDF; Cellulose; PA6

ClassificationCode：TQ352.7

year,volume(issue):pagination： 2018,38(2):17-21

Abstract：

In order to improve thermal safety performance of lithium battery separator, The cellulose/nylon 6 (PA6) lithium battery separator was modified by the addition of polyvinylidene fluoride (PVDF) with PVP K30 as additive and using ionic liquid [Emim]Ac as solvent. The e?ects of PVDF content on the mechanical properties, liquid absorption, liquid retention, porosity and thermal stability were studied. The characteristics of modified separator were investigated through the methods of SEM and contact angle measurements. The results showed that the optimum comprehensive properties of separator were obtained when the content of PVDF in the casting solution is 1.5wt%, based on the casting solution consisted of 4wt% cellulose and 3wt% PA6. The mechanical strength of separator could reach 65.26MPa, the heat shrinkage rate, absorption rate, liquid retention rate and porosity could reach 2.1%、230%、67.2% and 53.3%, respectively. The mechanical properties and thermal safety stability of the modified separator were improved greatly.

Funds：

1.山东省自然科学基金资助项目(项目编号：ZR2017MB040)；2.天津市制浆造纸重点实验室（天津科技大学）开放基金资助项目（项目编号：201604）。

AuthorIntro：

第一作者简介：赵高杰（1992-），女，山东烟台人，曲阜师范大学硕士生，研究方向为生物质料的高值化利用。E-mail：2420464046@qq.com。*通讯作者，E-mail：sun.zhonghua@163.com。

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