High performance hybrid Al₂O₃/poly(vinyl alcohol-co-ethylene) nanofibrous membrane for lithium-ion battery separator

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• 作者：Qiongzhen Liu ; Ming Xia ; Jiahui Chen ; Yifei Tao ; Yuedan Wang ; Ke Liu ; Mufang Li ; Wenwen Wang ; Dong Wang ; ^{wangdon08@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lithium-ion battery ; hybrid nanofibrous separator ; wettability ; interfacial resistance ; cycling performance
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：10 September 2015
• 年：2015
• 卷：176
• 期：Complete
• 页码：949-955
• 全文大小：1651 K

文摘

High performance Al₂O₃@NFs/PET/NFs separator possessing hierarchically three-dimensional tortuous structure has been developed to promote the cell performance of NFs/PET/NFs separator. The separator comprises a poly (ethylene terephthalate) (PET) nonwoven sandwiched between two poly (vinyl alcohol-co-ethylene) (PVA-co-PE) nanofirous membrane and inorganic Al₂O₃ coating layers on both sides for surface modification. The Al₂O₃@NFs/PET/NFs separator shows high porosity and impressively superior electrolyte affinity, thus resulting in higher ion conductivity, smaller interfacial resistance, excellent rate capabilities and cycling performance, compared to the NFs/PET/NFs separator and a commercial PP/PE/PP separator. This high cell performance can be ascribed to synergetic effects of inherent good hydrophilicity of γ-Al₂O₃ nanopowder coatings and well-designed tortuous nanoporous structure of NFs/PET/NFs membrane. This study suggests that the Al₂O₃@NFs/PET/NFs separator is a desirable alternative to commercial lithium-ion battery separators, especially promising for large-sized lithium batteries.