Abstract
In this study, PPESK/PVDF/PPESK tri-layer composite separators for lithium-ion batteries were prepared by electrospinning technique. The physical properties, electrochemical performances and thermal properties of composite separators were investigated. Results indicate that PPESK/PVDF/PPESK separator displays good wettability in liquid electrolyte. The electrolyte uptake of PPESK/PVDF/PPESK separator is much higher than that of electrospun PVDF, which leads to higher ionic conductivity of PPESK/PVDF/PPESK separator than PVDF separator. Discharge capacity of the cell assembled with PPESK/PVDF/PPESK separator is increased by 50 % than that with PVDF separator. Initial charge–discharge efficiency and capacity retention property of the cell with PPESK/PVDF/PPESK are better than those with PVDF separator or PPESK separator. In addition, when the mass ratio between PPESK and PVDF resins is increased to 4:3, PPESK/PVDF/PPESK separators show good thermal dimensional stability even thermally treated at 180 °C for 1 h.
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Acknowledgments
This experiment is supported by Natural Science Foundation of Liaoning Province, China (Grant No. 20091060) Aeronautical Sciences Foundation of Liaoning Province, China (Grant No. 2010ZC54006) and Program for Liaoning Excellent Talents in University, China (No. LJQ2012013). The authors would like to acknowledge the valuable help given by the organizations.
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Lu, C., Qi, W., Li, L. et al. Electrochemical performance and thermal property of electrospun PPESK/PVDF/PPESK composite separator for lithium-ion battery. J Appl Electrochem 43, 711–720 (2013). https://doi.org/10.1007/s10800-013-0561-2
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DOI: https://doi.org/10.1007/s10800-013-0561-2