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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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二氧化硅/聚乙烯醇多孔层对锂离子电池用聚丙烯隔膜性能的影响
DOI: 10.11777/j.issn1000-3304.2015.15178, PP. 1307-1312
Keywords: 陶瓷涂覆层,水性分散液,多孔网络结构,聚丙烯隔膜
Abstract:
以二氧化硅(SiO2)为陶瓷颗粒,以聚乙烯醇(PVA)为粘结剂,以水为分散介质,制备出一种水性SiO2分散液.采用浸涂法将SiO2陶瓷层涂覆到聚丙烯(PP)隔膜表面.对SiO2/PVA涂覆层的表面及断面形貌进行了表征,对原隔膜及复合隔膜的孔结构进行了分析,对水及水性SiO2分散液在隔膜表面的接触角进行了测试,并研究了陶瓷涂覆层对隔膜热稳定性、润湿性、吸液量、离子电导率、倍率性能及循环性能的影响.测试结果表明,涂覆层具有多孔网络结构,其厚度仅为800nm.涂覆层的引入,使复合隔膜的孔隙率增大到62.9%,而其Gurley数则降低到515s.与原隔膜相比,复合隔膜的热收缩率降低,液体电解液对复合隔膜的润湿性明显改善,复合隔膜的吸液量和离子电导率增大,电池倍率性能和循环性能提高.
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