Ionic conductivity enhancement in gel polymer electrolyte membrane with N-methyl-N-butyl-piperidine-bis(trifluoromethylsulfonyl) imide ionic liquid for lithium ion battery

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 502; pp. 130 - 138
• Main Authors: Ma, Y., Li, L.B., Gao, G.X., Yang, X.Y., You, J., Yang, P.X.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05-08-2016
• Subjects: Conductivity; Electrolytes; Gel polymerelectrolyte; Ionic conductivity; Ionic liquid; Ionic liquids; Lithium ion battery; Lithium-ion batteries; Membranes; Polyvinyl alcohols; Polyvinylidene fluorides; Scanning electron microscopy; Thermal properties; Conductivity; Lithium ion battery; Gel polymerelectrolyte; Ionic liquid
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2016.05.011

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•Casting method was used to prepare gel electrolyte membrane.•Tensile strength of PVDF/PVA/IL was 24.11MPa.•PVDF/PVA/IL membrane achieve σ of 1.19×10−3S/cm in experiment in a simple way.•Lithium ions transference number of PVDF/PVA/IL membrane was 0.45.•104.6mAhg−1 discharge capacity with an efficiency of over 95% after 99 cycles.
A novel gel polymer electrolyte (GPE) based on polyvinylidene fluoride (PVdF) and polyvinyl alcohol (PVA) with reliable electrochemical performance, mechanical robustness and safety features is prepared by a casting method. The physical, electrochemical and thermal properties of the casting membrane are characterized by scanning electron microscopy (SEM), atomic force microscope (AFM), thermal gravimetric analysis (TG), alternating-current (AC) impedance and charge–discharge techniques. The resulting polymer membrane shows a high ionic conductivity of 1.19×10−3S/cm with 45.5wt% of ionic liquid (IL) content while the cell assembled with PVdF/PVA/IL electrolyte delivers better electrochemical stability and higher discharge capacity than that without IL, and the thermal stability is obtained compared to conventional liquid electrolytes.