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최정희,하청완,최해영,신헌철,이상민 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
The electrochemical comparison between Sb2S3 and its composite with carbon (Sb2S3/C) involved by sodium ioncarrier are explained by enhanced kinetics, particularly with respect to improved interfacial conductivity by surfacemodulation by carbon. Sb2S3 and Sb2S3/C are synthesized by a high energy mechanical milling process. Thesuccessful synthesis of these materials is confirmed with X-ray diffraction (XRD), scanning electron microscopy,and transmission electron microscopy (TEM). As an anode material for sodium ion batteries, Sb2S3 exhibits an initialsodiation/desodiation capacity of 1,021/523 mAh g-1whereas the Sb2S3/C composite exhibits a higher reversiblecapacity (642 mAh g-1). Furthermore, the cycle performance and rate capability of the Sb2S3/C composite areestimated to be much better than those of Sb and Sb2S3. Electrochemical impedance spectroscopy analysis showsthat the Sb2S3/C composite exhibited charge transfer resistance and surface film resistance much lower than Sb2S3. X-ray photoelectron spectroscopy analyses of both electrodes demonstrate that NaF layer on Sb2S3/C compositeelectrode leads to the better electrochemical performances. In order to clarify the electrochemical reaction mechanism,ex-situ XRD based on differential capacity plots and ex-situ HR-TEM analyses of the Sb2S3/C compositeelectrode are carried out and its reaction mechanism was established.
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