Coaxial Electrospun Cellulose-Core Fluoropolymer-Shell Fibrous Membrane from Recycled Cigarette Filter as Separator for High Performance Lithium-Ion Battery

• Published in: ACS sustainable chemistry & engineering Vol. 3; no. 5; pp. 932 - 940
• Main Authors: Huang, Fenglin, Xu, Yunfei, Peng, Bin, Su, Yangfen, Jiang, Feng, Hsieh, You-Lo, Wei, Qufu
• Format: Journal Article
• Language: English
• Published: American Chemical Society 04.05.2015
• Subjects: Recycled cellulose; Coaxial electrospinning; Separator
• ISSN: 2168-0485; 2168-0485
• DOI: 10.1021/acssuschemeng.5b00032

This paper reports an eco-friendly approach for extracting cellulose acetate (CA) from waste cigarette filter to construct a cellulose-based membrane separator for a high-performance lithium-ion battery. A cellulose/poly­(vinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) nanofiber membrane was prepared by coaxial electrospinning of a cellulose acetate core and PVDF-HFP shell, then hydrolyzed by LiOH. The cellulose-core/PVD-HFP-shell fibrous membrane shows good tensile strength (34.1 MPa), high porosity (66%), excellent thermal stability (to 200 °C), and super electrolyte compatibility (355% electrolyte uptake). It has a lower interfacial resistance (98.5 Ω) and higher ionic conductivity (6.16 mS cm–1) than those of commercial separators (280.0 Ω and 0.88 mS cm–1). In addition, the rate capability (138 mAh·g–1) and cycling performance (75.4% after 100 cycles) are also superior to those of the commercial separators, demonstrating the cellulose-core fibrous membrane to be a promising separator for a high-power and more secure lithium-ion battery.