| Melamine formaldehyde resin (MF) is a kind of thermosetting resin, which has excellent physical and chemical properties. Therefore, MF composite materials has been widely used.In this paper, two kinds of MF composite fiber materials were fabricated. Firstly, MF-based nonwoven composited material was prepared by electrospinning method and fabricated it as the separator of Lithium-ion battery, the safty and cycle performance of Lithium-ion battery was proved. Secondly, MF/SA/PVA composited nanofiber material was also prepared by adding the initial polymerization solution of MF to the SA and PVA contained solution by electrospinning method. The main contents are as follows:A heat-resistant separator based on melamine formaldehyde resin was prepared by reactive electrospinning. The resultant separator possessed higher ionc conductivity (0.79 mS/cm), wider electrochemical window (4.7 V), higher porosity (72%), and superior liquid electrolyte wettability and retention against conventional PP separators. Moreover, the high thermal stable temperature (180℃) in the case of static pressure could be potential to improve the safety characteristic of cells. Most importantly, the LiMn2O4/graphite cells with MF-based separators revealed an improved cycle life and rate capability against to the cells with commercial separators. Notably, these characteristic endow MF-based separator is a promising candidate for lithium-ion battery. Composited nanofibers of MF/SA/PVA were prepared by electrospinning method, and it was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermal gravimetric analysis (TG), tensile strength measurement and X-ray diffraction (XRD). Compared with the performance of SA/PVA and MF/PVA nanofibers, MF reduced the crystallinity of MF/SA/PVA composite nanofibers significantly, improved the spinnability, tensile strength and thermal stability of the MF/SA/PVA composite nanofibers. |
PDF Full Text Request