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A Composite Gel Polymer Electrolyte with High Performance Based on Poly(Vinylidene Fluoride) and Polyborate for Lithium Ion Batteries

Authors

  • Yusong Zhu,

    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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  • Shiying Xiao,

    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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  • Yi Shi,

    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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  • Yaqiong Yang,

    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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  • Yuyang Hou,

    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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  • Yuping Wu

    Corresponding author
    1. New Energy and Materials Laboratory (NEML), Department of Chemistry & Shanghai, Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, China
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Abstract

A composite membrane based on electrospun poly(vinylidene fluoride) (PVDF) and lithium polyvinyl alcohol oxalate borate (LiPVAOB) exhibiting high safety (self-extinguishing) and good mechanical property is prepared. The ionic conductivity of the as-prepared gel polymer electrolyte from this composite membrane saturated with 1 mol L−1 LiPF6 electrolyte at ambient temperature can be up to 0.26 mS cm−1, higher than that of the corresponding well-used commercial separator (Celgard 2730), 0.21 mS cm−1. Moreover, the lithium ion transference in the gel polymer electrolyte at room temperature is 0.58, twice as that in the commercial separator (0.27). Furthermore, the absorbed electrolyte solvent is difficult to evaporate at elevated temperature. Its electrochemical performance is evaluated by using LiFePO4 cathode. The obtained results suggest that this gel-type composite membrane shows great possibilities for use in large-capacity lithium ion batteries that require high safety.

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