Construction of PMIA@PAN/PVDF-HFP/TiO2 coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries |
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| Affiliation: | 1. Institute of Rheological Mechanics, Xiangtan University, Hunan 411105, China;2. School of Mechanical Engineering and Mechanics, Xiangtan University, Hunan 411105, China;1. School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China;2. Key Laboratory of Advanced Textile Composites of Ministry of Education, Tianjin 300387, China;3. TRYD Textile Research Institute, Yancheng 224000, China;1. Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, Shanghai, 201804, China;2. Department of Polymer Materials, School of Materials Science & Engineering, Tongji University, Shanghai, 201804, China;3. Kunshan Innovative Materials Company, Kunshan, 215300, Jiangsu Province, China;1. School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China;2. Sichuan Province Key Laboratory for Corrosion and Protection of Materials, Sichuan University of Science & Engineering, Zigong 643000, China;3. Zigong Advanced Carbon Materials Industrial Technology Research Institute, Zigong 643000, China |
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| Abstract: | Poly(m-phthaloyl-m-phenylenediamine) (PMIA) is promising as the separator in lithium-ion batteries (LIBs) for its excellent thermostability, insulation and self-extinguishing properties. However, its low mechanical strength and poor electrolyte affinity limit its application in LIBs. In this work, a new PMIA@polyacrylonitrile-polyvinylidene fluoride hexafluoropropylene-titanium dioxide (PMIA@PAN/PVDF-HFP/TiO2) composite fibrous separator with a coaxial core-shell structure was developed by combining coaxial electrospinning, hot pressing, and heat treatment techniques. This separator not only inherits the exceptional thermostability of PMIA, showing no evident thermal shrinkage at 220 °C, but also reveals improved mechanical strength (29.7 MPa) due to the formation of firm connections between fibers with the melted PVDF-HFP. Meanwhile, the massive polar groups in PVDF-HFP play a vital role in improving the electrolyte affinity, which renders the separator a high ionic conductivity of 1.36 × 10−3 S/cm. Therefore, the LIBs with PMIA@PAN/PVDF-HFP/TiO2 separators exhibited excellent cycling and rate performance at 25 °C, and a high capacity retention rate (76.2%) at 80 °C for 200 cycles at 1 C. Besides, the lithium metal symmetric battery assembled by the separator showed a small overpotential, indicating that the separator had a role in inhibiting lithium dendrites. In short, the PMIA@PAN/PVDF-HFP/TiO2 separator possesses a wide application prospect in the domain of LIBs. |
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