摘要
以氧化包覆改性的聚丙烯纤维和棉纤维为主要材料,采用湿法无纺布抄造的方法制备出了锂离子电池隔膜.研究了不同纤维配比对隔膜的抗张强度、孔隙率、吸液率、保液率和热收缩等性能的影响,并对锂离子电池隔膜的形貌和电导率进行了分析.结果表明,当棉纤维与改性聚丙烯纤维的质量配比为1∶1时,其抗张强度达到1.647 1kN/m,孔隙率为45.45%,吸液率和吸液高度分别为687.3%和39.2mm,相应的保液率为121.3%,得到了性能良好的锂离子电池隔膜.通过热收缩性能测试得出,加入棉纤维可以提高隔膜的热稳定性.SEM结果表明,改性聚丙烯纤维与棉纤维之间相互交织形成隔膜,所得隔膜在电解液中的电导率为2.39×10^(-3) S/cm.
Lithiun ion battery separator was prepared modified with the method of oxidation and coating different ratio of fiber on tensile strength, porosity, from cotton fibre and polypropylene fiber which was by wet non-woven papermaking. The influence of electrolyte uptake, electrolyte retaining and thermal shrinkage of separator was studied, and the morphology and conductivity of the lithium ion battery eparator was analyzed. The results showed that, when the fiber ratio was 1 ： 1, lithium ion battery separator with good performance was prepared including tensile strength （1. 647 1 kN/m）, porosity （45.45%）, electrolyte uptake （687. 3%）, capillary rise of paper （39. 2 mm）, and electrolyte retaining （121.3%）. The thermal stability of separator was improved by adding cotton fibre through performance test. It was found by SEM that the separator was interwoven with modified polypropylene fiber and cotton fiber, and the conductivity of eparator was 2. 39× 10-3 S/cm.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2017年第4期64-69,共6页
Membrane Science and Technology
基金
湖南省自然科学基金(14JJ4036)
电力与交通材料保护湖南省重点实验室(长沙理工大学)开放基金(2015CL04)
关键词
棉纤维
聚丙烯纤维
无纺布
锂离子电池隔膜
cotton fibre
polypropylene fiber
non-woven
Lithiun ion battery separator
