| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 101 === A Li2FeSiO4 nanoparticles (NLFS, length：100～200 nm, width：30～120 nm) has been prepared by using LiOH‧H2O, FeC2O4‧2H2O, and nano SiO2 as precursors, via a hydrothermal process. Then, the resin and the graphite oxide or graphene as carbon source was coated on the Li2FeSiO4 (NLFS/C) via an in-situ or batch coating route.
The crystal structures of NLFS/C are characterized by X-ray diffraction (XRD), and the morphology of NLFS/C is observed by transmission electron microscope (TEM) and scanning electron microscope (SEM). With the carbon coating, NLFS can be prevented from aggregation, and improve the dispersion.
The charge-discharge performances of the NLFS/C composite materials are demonstrated by using coin cells. NLFS be coated by batch route exhibits high discharge capacity of 182 mAh g-1 at 0.05C, in the voltage range between 1.5-4.7 V. This indicates that the present of graphene can efficiently elevate the performance of LFS.
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