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Electrochemical performance and thermal property of electrospun PPESK/PVDF/PPESK composite separator for lithium-ion battery |
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| Authors: | Chun Lu Wen Qi Li Li Jialong Xu Ping Chen Riqin Xu Ling Han Qi Yu |
| Affiliation: | 1. Liaoning Key Laboratory of Advanced Polymer Matrix Composites Manufacturing Technology and College of Aerospace Engineering, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China 2. State Key Laboratory of Fine Chemicals and School of Chemical Engineering, Dalian University of Technology, Dalian, 116012, Liaoning, China 3. Liaoning Province Product Quality Supervision and Inspection Institute, Shenyang, 110032, Liaoning, China 4. Shantou Jinguang High Tech Co.,Ltd, Shantou, 515064, Guangdong, China |
| 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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