摘要
为提高锂电池隔膜的安全性能,以离子液体[Emim]Ac为溶剂,以聚乙烯吡咯烷酮(PVP K30)为致孔剂,利用聚丙烯腈(PAN)对纤维素/尼龙6锂电池隔膜进行改性,探讨PAN含量对隔膜的机械性能、吸液率、保液率、孔隙率及热稳定性能的影响,并进行了SEM、TG、接触角测试表征.最终结果表明,当铸膜液中PAN含量为3 wt%、纤维素含量为4 wt%、尼龙6含量为3 wt%、PVP K30含量为4 wt%时,隔膜的综合性能最佳,此时,隔膜的拉伸强度达71.24 MPa,断裂伸长率为33.7%,吸液率、保液率和孔隙率分别达225.3%、66.7%和55.7%,最大热收缩力和热收缩率分别为1.27 N和2.0%,各相关测试说明了改性后隔膜的机械性能、热稳定性等得到了改善,安全性能得到保障.
In order to improve the safety performance of lithium battery separator,the cellulose/nylon 6 lithium battery separator was modified by polyacrylonitrile(PAN)with polyvinylpyrrolidone(PVP K30)as additive and using ionic liquid[Emim]Ac as solvent.The e ects of PAN content on the mechanical properties,liquid absorption,liquid retention,porosity and thermal stability of the separator were studied.The characteristics of modified separator were investigated through the methods of SEM,thermogravimetric analysis and contact angle measurements.The results showed that when the content of PAN,cellulose,nylon 6,PVP K30 were 3 wt%,4 wt%,3 wt%,4 wt%,respectively,the separator had the best comprehensive performance.At this point,the tensile strength of the separator reached 71.24 MPa,the elongation at break was 33.7%.The electrolyte uptake,retention rate and porosity were 225.3%,66.7%and 55.7%,respectively.The maximum thermal shrinkage stress was 1.27 N and the thermal shrinkage was 2.0%.The related characterization indicated that the mechanical properties and thermal stability of the modified separator were improved,and the thermal safety stability was guaranteed.
作者
王爱艾
孙中华
梁杰
宁如霞
李莉
周翔升
WANG Aiai;SUN Zhonghua;LIANG Jie;NING Ruxia;LI Li;ZHOU Xiangsheng(College of Engineering,Qufu Normal University,276826,Rizhao;Lithium Battery Product Quality Supervision and Inspection Center,277100,Zaozhuang,Shandong,PRC)
出处
《曲阜师范大学学报（自然科学版）》
CAS
2020年第1期87-91,共5页
Journal of Qufu Normal University(Natural Science)
基金
山东省自然科学基金(ZR2017MB040)
山东省重点研发计划项目(2019GSF109110)
