电子元件与材料2025，Vol.44Issue(9)：1002-1010,9.DOI:10.14106/j.cnki.1001-2028.2025.0180
原纤化对位芳纶复合聚烯烃基纤维耐高温隔膜制备
Preparation of high-temperature-resistant separators from protofibrillated para-aramid composite polyolefin-based fibers
摘要
Abstract
In order to improve the thermal stability of lithium-ion battery separators,raw fibrillated para-aramid pulp meal was combined with polyethylene/polypropylene composite(ES)fibers using a wet papermaking technique to create a high-temperature-resistant single-layer composite separator.By evaluating the separator's physical and electrochemical characteristics,the effects of varying ratios of ES fiber addition on the composite separator's performance were examined,and its benefits and drawbacks were contrasted with those of the Celgard 2500(PP)separator.The results showed that the composite separator exhibited excellent thermal stability,with zero thermal shrinkage after heat treatment at 250 ℃ for 0.5 h.The composite separator had the best overall performance when the mass ratio of ES fibers was 15％,and the discharge specific capacity of the assembled lithium cobaltate full cell was 151.1 mAh/g with a coulombic efficiency of 78.49％after 100 cycles with 1C rate under the voltage window of 3-4.45 V.Under the same conditions,the cycling discharge capacity of the PP separator was 163.3 mAh/g,with a coulombic efficiency of 85.45％.The reason for this is that the composite separator is more susceptible to dead lithium and dendrite growth due to the uneven distribution of pore sizes caused by the hydrophobicity of the ES fibers.关键词
原纤化对位芳纶浆粕/聚乙烯/聚丙烯复合纤维/湿法造纸工艺/锂离子电池隔膜/耐高温Key words
protofibrillated para-aramid pulp/polyethylene/polypropylene composite fibers/wet papermaking process/lithium-ion battery separators/high temperature resistance分类
信息技术与安全科学引用本文复制引用
张奥捷,张雪姣,幸楚粤,龙金,胡健..原纤化对位芳纶复合聚烯烃基纤维耐高温隔膜制备[J].电子元件与材料,2025,44(9):1002-1010,9.基金项目
中央高校基本科研业务费专项资金(x2zzD2250030) （x2zzD2250030）
