Abstract
LiFePO4/C nano-composite has been successfully synthesized by solid-state reaction. The crystal structure and morphology of the LiFePO4/C are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicate that single-phase LiFePO4/C with olivine structure and suitable particle size was obtained. The electrochemical performance of the LiFePO4/C electrodes with poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVDF) and poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) as binders are compared. Galvanostatic charge–discharge testing shows using PVDF-HFP binder has highest rate capability and cyclic property. The better rate performance and cycling stability of the LiFePO4/C electrode containing PVDF-HFP binder is found to be due to the more free mobile Li+ ion providing form the higher amorphocity and lower glass transition temperature (Tg).
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