The poly (vinylidene fluoride)/poly (methyl methacrylate)(PVDF/PMMA) composite fibrous membranes with different blend ratio for use as separator of lithium-ion batteries have been developed by electrospinning technique. The surface morphology and crystal structure of electrospun PVDF/PMMA composite fibrous membranes are characterized using scanning electron microscopy (SEM), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and differential scanning calorimetry (DSC).The results indicated that the addition of PMMA into PVDF increased the fiber diameter, decreased the crystalline of electrospun composite fibrous membranes and the good molecular level interaction between these two polymers were obtained. Meanwhile,electrospun PVDF/PMMA (90/10) composite fibrous membranes exhibited the highest ionic conductivity of 2.54×10-3S/cm at room temperature with electrochemical stability of up to 5.0V.

The electrospinning technique was used to prepare the Polyethylene Terephthalate (PET) mats. The electrospun PET mats with different fiber diameters have many applications such as biotechnological and biomedical, functional coating, lithum-ion membrane and filtering membrane and so on. Several techniques including scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and single fiber electronic tensile strength tester were used to characterize the electrospun PET mats before/after thermal treatment. When choosing the suitable temperature, the thermal treatment could improve the tensile properties without damage the structure of electrospun PET nanofiber mat, if the suitable temperature was been choosed.

The electrospinning combined with the sintering process were used to prepare carbon-coated lithium iron phosphates (LiFePO4/C) cathode materials for lithium ion batteries (LIB). In sintering process, different procedures were used to synthesize the LiFePO4/C composite materials. The effect of the sintering time and heating rate on the structure, surface morphology and carbon content of LiFePO4/C composite materials were investigated by wide angel X-ray diffraction (WXRD), scanning electron microscope (SEM), and elemental analysis (EA) techniques. It has better structure when the sintering process is as follows: heating rate is 2 oC min-1 and pre-oxidized time is 3h at 280 oC and carbonized time is 8h at 700 oC.