FeS2/C composite as an anode for lithium ion batteries with enhanced reversible capacity
FeS2/C composite as an anode for lithium ion batteries with enhanced reversible capacity
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DOI：
10.1016/j.jpowsour.2012.05.112
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发表时间：
2012-11
影响因子：
9.2
通讯作者：
Dan Zhang;Y. Mai;J. Xiang;X. Xia;Y. Qiao;J. Tu
中科院分区：
文献类型：
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作者：
Dan Zhang;Y. Mai;J. Xiang;X. Xia;Y. Qiao;J. Tu
以葡萄糖为碳源，通过简单的固相反应制备了碳包覆FeS 2（FeS 2/C）复合材料。多孔FeS 2颗粒被无定形碳涂层均匀地包围。作为锂离子电池负极材料，FeS 2/C复合材料比未改性的FeS 2具有更高的可逆容量和更好的循环性能。50次循环后，FeS 2/C复合材料的比容量为495 mAh g-1，远高于FeS 2的比容量（345 mAh g-1）。为了研究碳涂层的效果，对循环后的电极进行了X射线衍射（XRD）、扫描电子显微镜（SEM）和X射线光电子能谱（XPS）分析。这是由于碳涂层的引入，它可以提高导电性，减少硫的溶解和腐蚀的HF，并在循环过程中稳定的多孔结构。
Carbon coated FeS2(FeS2/C) composite is prepared via a simple solid state reaction using glucose as carbon source. The porous FeS2particles are uniformly surrounded by the amorphous carbon coating. As an anode material for lithium ion batteries, the FeS2/C composite exhibits higher reversible capacity and better cycling performance than the unmodified FeS2. The specific capacity of the FeS2/C composite after 50 cycles is 495 mAh g−1, much higher than that of FeS2(345 mAh g−1). In order to investigate the effect of carbon coating, the cycled electrodes have been analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The improvement is attributed to the introduction of carbon coating, which can enhance the conductivity, reduce the dissolution of sulfur and corrosion from HF, and stabilize the porous structure during cycling.