Abstract
Based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) and lithium tetrafluoroborate (LiBF4) salt along with blending plasticizers, ethylene carbonate (EC) and propylene carbonate (PC), high Li-ion-conducting gel polymer electrolyte films are developed. Their properties are characterized by various techniques. The ambient temperature ionic conductivity of the 85PVdF-HFP:15LiBF4 + 150(EC + PC) electrolyte film has a high value of 8.1 × 10−4 S cm−1. Its crystallinity, melting point, and electrochemical stability window are 9.5%, 115 °C, and 4.6 V, respectively. The mechanical testing shows that the Young’s modulus, yield strength, and breaking strain of this electrolyte film are 36.8 MPa, 3.4 MPa, and 320%, respectively. Lithium-ion batteries based on the gel polymer electrolyte film exhibit remarkable charge–discharge and cycling performances. The initial discharge capacity of this battery is as high as 165.1 mAh g−1 at 0.1 C and just shows a small capacity fading of 4.8% after 120 cycles, indicating that the 85PVdF-HFP:15LiBF4 + 150(EC + PC) system is an excellent electrolyte candidate for lithium-ion battery applications. The charge–discharge performance of the Li-ion cell fabricated with this gel polymer electrolyte film is apparently better than that of the previously reported Li-ion cells fabricated with other PVdF-HFP-based gel polymer electrolyte films.
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This work was supported by the International S&T Cooperation Program of China (No. 2014DFA53020) and Guangdong Innovative and Entrepreneurial Research Team Program (No. 2013C099).
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Song, S., Wang, J., Tang, J. et al. Preparation, properties, and Li-ion battery application of EC + PC-modified PVdF-HFP gel polymer electrolyte films. Ionics 23, 3365–3375 (2017). https://doi.org/10.1007/s11581-017-2130-x
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DOI: https://doi.org/10.1007/s11581-017-2130-x