Synthesis Characterization And Perperties Of Tin Based Graphene Coated Anode Materials

Lithium ion batteries (LIBs) have been considered as one of the mostpromising energy storage devices for electric vehicles (EVs) and hybridelectric vehicles (HEVs). The most popular anode material forcommercialized LIBs is graphite. The theoretical capacity for graphite is only372mAh/g, hardly meeting the demand of EVs and HEVs. As a result, theresearch on anode material for LIB of high energy density and long cycle lifeis looming ahead. This paper is mainly about the following two parts:(1) SnO/SnO2/GNS composite and Sn/GNS composite has beenprepared through a simple one-pot NaBH4reduction of SnCl2/GO (grapheneoxide) in EG and water as the solvent, respectively. The as-preparedcomposites are characterized by X-ray diffraction (XRD), X-rayphotoelectron spectra (XPS), scanning electron microscope (SEM),transmission electron microscopy (TEM). Galvanostatic charge-discharge testand cyclic voltammograms are used to explore the electrochemical properties of SnO/SnO2/GNS composite. This SnO/SnO2/GNS composite exhibits highcharge/discharge capacity, good cycling stability and excellent rate capability.A specific discharge capacity of approximately464.2mAh/g is retained aftercharged/discharged at a current density of1000mA/g for30cycles. Inaddition, we investigated the influence of synthesis conditions on thestructure and electric performance of the materials.(2) nanoparticles-scaffolded N-containing SnO2microspheres have beensolvothermally synthesized by the reaction of SnCl45H2O, glucose andCO(NH2)2in ethylenediamine. Then N-SnO2/GNS composite are prepared byultrasonic of graphene oxide and N-SnO2in ethanol. The as-preparedcomposite was investigated by XRD, FT-IR, SEM and TEM. Galvanostaticcharge-discharge test and cyclic voltammograms are used to explore theelectrochemical properties of N-SnO2/GNS composite. A specific dischargecapacity of approximately490.8mAh/g is retained after charged/dischargedat a current density of100mA/g for50cycles. This result shows theN-SnO2/GNS composite has good electrochemical stability, which makes theN-SnO2/GNS composite a promising low-cost anode material for highperformance lithium ion batteries.