摘要
当前商业上常用聚烯烃薄膜作为锂离子电池隔膜,但是其热收缩性差和力学性能弱的缺点限制了锂离子电池的应用,因此研究具备高热稳定性和对电解液具有良好润湿性的电池隔膜显得尤为重要。本文利用层层自组装技术制备纳米纤维素/Al_(2)O_(3)胶体/PE锂离子电池隔膜,探究出了制备NC/A-PE膜的适宜条件:Al_(2)O_(3)溶胶的固含量为2%(质量分数),麦麸纳米纤维素悬浮液的固含量为0.2%(质量分数),浸润时间为5min,组装层数为20层。结果表明,组装后的电池隔膜的热稳定性和电解液润湿性均得到了显著改善;其杨氏模量最高可提高至原来的235.2%,在电池隔膜组装的过程中能有效抵抗形变;经过扫描电子显微镜(SEM)、原子力显微镜(AFM)、场发射扫描电镜(FEM)、傅里叶变换红外光谱(FTIR)表征,证实氧化铝及纤维素成功地组装于PE基膜上,呈现出层次分明、厚度均一的多层膜结构,以此方法制备的电池隔膜安全无毒,热稳定性、力学性能和电解液润湿性得到了显著改善,有潜在的应用前景。
Currently,polyolefin films are commonly used as commercial battery’s separation membranes,but their poor thermal shrinkage and weak mechanical properties limit the application of lithium-ion batteries.Therefore,it is particularly important to develop the membranes with high thermal stability and excellent wettability in organic liquid electrolytes.The nanocellulose/Al_(2)O_(3) colloid/PE separation membrane for lithium-ion battery was prepared by layer-by-layer self-assembly technology,and the optimal preparation conditions for the NC/A-PE membrane were determined as the solid content of Al_(2)O_(3) sol 2%(mass fraction),the solid content of wheat bran nanocellulose suspension 0.2%(mass fraction),the infiltration time 5min,and the number of assembly layers 20.The thermal stability and the wettability of the electrolyte were improved with a 235.2%increase in the maximum Young’s modulus,which can effectively resist deformation during the membrane assembly.Scanning electron microscope(SEM),atomic force microscope(AFM)and field emission electron microscope(FEM)characterizations confirmed that aluminum oxide and nanocellulose were successfully assembled on the PE membrane,showing a stratified structure with distinct layers and uniform thickness.The battery separation membrane prepared by this method was green,safe,and non-toxic,and its thermal stability,mechanical properties and wettability to electrolyte have been significantly improved,showing a potential application prospect.
作者
时培东
胡春蕊
郑苗苗
赵娟
刘锐
贾原媛
SHI Peidong;HU Chunrui;ZHENG Miaomiao;ZHAO Juan;LIU Rui;JIA Yuanyuan(College of Food Science and Engineering,Tianjin University of Science and Technology,Tianjin 300457,China;Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization,College of Chemical Engineering and Materials,Tianjin University of Science and Technology,Tianjin 300457,China;Research Centre of Modern Analysis Technology,Tianjin University of Science and Technology,Tianjin 300457,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第10期5624-5633,共10页
Chemical Industry and Engineering Progress
基金
天津市教委科研计划项目(自然科学)一般项目(2018KJ089)。
关键词
电池隔膜
层层自组装
纳米纤维素
氧化铝
battery separator membrane
layer-by-layer assembly
nanocellulose
aluminium oxide(Al_(2)O_(3))
