Lithium ion battery separator with high performance and high safety enabled by tri-layered SiO2@PI/m-PE/SiO2@PI nanofiber composite membrane
Lithium ion battery separator with high performance and high safety enabled by tri-layered SiO2@PI/m-PE/SiO2@PI nanofiber composite membrane
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DOI：
10.1016/j.jpowsour.2018.06.008
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发表时间：
2018-08
影响因子：
9.2
通讯作者：
L. Jian;Liu Yanbo;Wenxiu Yang;Qian Ren;Li Fangying;Huang Zheng
中科院分区：
文献类型：
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作者：
L. Jian;Liu Yanbo;Wenxiu Yang;Qian Ren;Li Fangying;Huang Zheng
本研究基于分形理论的Von Koch曲线，研制了一种新型无针电纺丝机，用于制备电纺丝膜。以两层sio2纳米颗粒掺杂聚酰亚胺膜为鞘层，单层乙基纤维素改性PE膜为核心层，精心设计了一种三明治状复合隔膜，用于高性能锂离子电池的隔膜。这种三层复合隔膜结合了低温下的热关闭功能和高温下的热失控功能，其中乙基纤维素用于增强商用聚乙烯隔膜与静电纺聚酰亚胺膜之间的界面亲和力和强度。二氧化硅纳米颗粒掺杂聚酰亚胺制备的两层电纺丝膜具有较高的热稳定性和高温失控功能，而乙基纤维素改性聚乙烯膜的单芯层具有较高的力学性能和低温关机功能。所得的三层复合膜作为电动汽车的锂离子电池隔膜具有很高的潜力。
In the current study, a novel needleless electro-spinneret based on the Von Koch curve of Fractal Theory is developed to prepare electrospun membrane. A sandwich-like composite separator is elaborately designed with two layers of SiO2nanoparticles doped polyimide membranes being the sheath layers and a single layer of ethylcellulose modified PE membrane being core layer towards its application for separators in high-performance lithium-ion batteries. This tri-layered composite separator combines both thermal shutdown function at low temperature and thermal runaway function at high temperature, where ethylcellulose is used to enhance the interfacial affinity and strength between commercial polyethylene separator and the electrospun polyimide membrane. The two sheath layers of electrospun membrane prepared by SiO2nanoparticles doped polyimide impart the separator with high thermal stability and high-temperature runaway function at, and the single core layer of ethylcellulose modified polyethylene membrane provides high mechanical property and low-temperature shutdown function. The resultant tri-layered composite membrane is of high potential as lithium-ion battery separators for electrically powered vehicles.