Fe2O3 particles enwrapped by graphene with excellent cyclability and rate capability as anode materials for lithium ion batteries
Fe2O3 particles enwrapped by graphene with excellent cyclability and rate capability as anode materials for lithium ion batteries
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DOI：
10.1016/j.apsusc.2012.11.118
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发表时间：
2013-02
影响因子：
6.7
通讯作者：
Wei Xiao;Zhixing Wang;Huajun Guo;Xinhai Li;Jiexi Wang;Si Huang;L. Gan
中科院分区：
文献类型：
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作者：
Wei Xiao;Zhixing Wang;Huajun Guo;Xinhai Li;Jiexi Wang;Si Huang;L. Gan
采用简单的水热法制备了不同石墨烯含量的Fe 2 O3/石墨烯复合材料。X射线衍射（XRD）表明存在赤铁矿，而傅里叶变换红外光谱（FI-IR）和拉曼光谱分析表明存在石墨烯和Fe 2 O3。此外，扫描电镜（SEM）和透射电镜（TEM）也显示了石墨烯与Fe 2 O3的良好结合，尤其是石墨烯质量分数为30%的复合材料。石墨烯质量分数为30%的Fe 2 O3/石墨烯复合材料作为锂离子电池负极材料，在50 mAg-1的电流密度下，循环50次后，其可逆充电容量达到1069 mAhg-1，循环稳定性良好。当电流密度增加到1000 mAg −1时，它仍然可以保持534 mAhg −1的充电容量。同时，石墨烯对复合材料电化学性能的关键作用也得到了证实。
A facile hydrothermal method is employed to prepare Fe2O3/graphene composites with different contents of graphene which is determined by thermogravimetric analysis (TG). While the X-ray diffraction (XRD) indicates the presence of hematite, the graphene and Fe2O3are demonstrated to be existed via Fourier transform infrared spectra (FI-IR) and Raman spectroscopic analysis. Furthermore, the scanning electron microscopy (SEM) and transmission electron microscope (TEM) also illustrate the good combination of graphene and Fe2O3, especially for the composite with graphene mass content of 30%. After performed as anode for lithium ion battery, Fe2O3/graphene composite with graphene mass content of 30% exhibits outstanding cyclability with highly reversible charge capacity of 1069mAhg−1after 50 cycles, at current density of 50mAg−1. And when the current density is increased to 1000mAg−1, it could still retain charge capacity of 534mAhg−1. Meanwhile, the critical role of graphene to the electrochemical performance of composites has also been proven.