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Construction of porous coating layer and electrochemical performances of the corresponding modified polyethylene separators for lithium ion batteries

Authors

  • Li-Feng Fang,

    1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou, People's Republic of China
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  • Jun-Li Shi,

    1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou, People's Republic of China
    2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, People's Republic of China
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  • Hao Li,

    1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou, People's Republic of China
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  • Bao-Ku Zhu,

    Corresponding author
    1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou, People's Republic of China
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  • Li-Ping Zhu

    1. Department of Polymer Science and Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization, Ministry of Education, Zhejiang University, Hangzhou, People's Republic of China
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ABSTRACT

To effectively improve the affinity of polyethylene (PE) separators with liquid electrolyte without causing a serious pore blockage and to develop a more suitable technology for the industrial production process, porous polyvinylidene fluoride (PVDF) layer-coated PE separators are prepared by the dip-coating method followed by a dry-cast process. Different from previous investigations, a less volatile solvent and a relatively volatile nonsolvent are used to yield a preferable pore structure. A brief introduction on the pore formation mechanism during the dry-cast process is provided. The pore structure of coating layer is found to be successfully controlled by changing evaporation temperature, nonsolvent content, and PVDF concentration. The porous PVDF coating layer-modified separators show better affinity with liquid electrolyte and thermal stability. Especially, the ionic conductivity of the modified separator/liquid electrolyte system with a suitable porous coating layer on the separator could reach two times as that of PE separator/liquid electrolyte system, and the cell assembled with modified PE separator shows better cycle performances. This modification process is proved to be a facile, controllable, and effective method for PE separator modification. Meanwhile, this work could provide some theoretical and technical guidance for the production process. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41036.

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