离子液体[Emim]Ac中聚偏氟乙烯改性纤维素/尼龙6锂电池隔膜的研究  

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

作　　者：赵高杰 孙中华 王爱艾[1] 宁如霞 梁洁 ZHAO Gaojie1,2, SUN Zhonghua1,2, WANG Aiai1, NING Ruxia1, LIANG Jie1(1 College of Engineering, Qufu Normal University, Rizhao 276826, China; 2. Tianjin Key Laboratory of Pulp ＆ Paper, Tianjin University of Science ＆ Technology, Tianjin 300457, China)

机构地区：[1]曲阜师范大学工学院,日照276826 [2]天津市制浆造纸重点实验室天津科技大学,天津300457

出　　处：《膜科学与技术》2018年第2期17-21,36,共6页Membrane Science and Technology

基　　金：山东省自然科学基金资助项目(ZR2017MB040);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(201604)

摘　　要：为提高锂电池隔膜的热安全性能,以实验室合成的离子液体([Emim]Ac)作为溶剂,以聚乙烯吡咯烷酮(PVP K30)作为添加剂,通过聚偏氟乙烯(PVDF)对纤维素/尼龙6(PA6)锂电池隔膜进行改性,讨论了PVDF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形貌结构和接触角测试表征.结果表明,在铸膜液中保持纤维素质量分数为4%,PA6质量分数为3%的基础上,当PVDF质量分数为1.5%时,隔膜的综合性能最佳,抗张强度达到65.26 MPa,热收缩率、吸液率、保液率和孔隙率分别达到2.1%、230%、67.2%和53.3%,经PVDF改性后隔膜的机械性能和热安全稳定性显著提高.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 effects 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 1.5％,based on the casting solution consisted of 4％ cellulose and 3％ PA6.The mechanical strength of separator could reach 65.26 MPa,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.

关 键 词：隔膜 离子液体 聚偏氟乙烯 纤维素 尼龙6 

分 类 号：TQ352.7[化学工程] TM912[电气工程—电力电子与电力传动]