Abstract
Gel polymer electrolyte films based on thermoplastic polyurethane (TPU) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) (1/1, w/w) were prepared by electrospinning polymer. The highest ionic conductivity was 6.62 × 10−3 S cm−1 for 10 wt% electrolyte solution at room temperature. And, high value of tensile strength (9.8 ± 0.2 MPa) and elongation at break (121.5 ± 0.2 %) existed. The Li/PE/LiFePO4 cell with the gel polymer electrolyte (GPE) delivered a high initial discharge capacity of 163.49 mAh g−1 under 0.1 C rate and exhibited microscale attenuation (5.5 %) after 50 cycles. With the excellent characteristics, it is suitable for practical application in polymer lithium-ion batteries.
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Abbreviations
- X c :
-
The crystallinity
- ΔH :
-
The fusion enthalpy of the membrane
- ΔH m :
-
The fusion enthalpy of PVDF with 100 % crystallinity
- Φ:
-
The PVDF weight fraction in blend membrane
- M wet :
-
The mass of the dry membrane
- M dry :
-
The mass of the wet membrane
- δ :
-
The ionic conductivity
- h :
-
The thickness of polymer electrolyte
- R b :
-
The bulk resistance of polymer electrolyte
- S :
-
The area of polymer electrolyte
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Acknowledgments
The workers gratefully appreciate the financial supports from the Youth Project of National Nature Science Foundation of China (Grant No. 51203131).
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Peng, X., Zhou, L., Jing, B. et al. A high-performance electrospun thermoplastic polyurethane/poly(vinylidene fluoride-co-hexafluoropropylene) gel polymer electrolyte for Li-ion batteries. J Solid State Electrochem 20, 255–262 (2016). https://doi.org/10.1007/s10008-015-3030-5
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DOI: https://doi.org/10.1007/s10008-015-3030-5