A comparison of anodically grown CuO nanotube film and Cu2O film as anodes for lithium ion batteries
A comparison of anodically grown CuO nanotube film and Cu2O film as anodes for lithium ion batteries
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DOI：
10.1007/s10008-007-0422-1
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发表时间：
2008-08
影响因子：
2.5
通讯作者：
J. Xiang;J. Tu;X. H. Huang;Y. Yang
中科院分区：
文献类型：
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作者：
J. Xiang;J. Tu;X. H. Huang;Y. Yang
采用直接氧化法和电化学阳极还原法制备了CuO纳米管薄膜和Cu2O薄膜。用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对薄膜的微观结构和形貌进行了表征。所得CuO为单斜晶系，管径约为100-300 nm，而所制备的Cu2O具有典型的结构，空间群为Pn3 mand，由致密的小面晶体组成。通过循环伏安和恒电流充放电测试，研究了纳米CuO和Cu2O薄膜作为锂离子电池负极的电化学性质。引入了“表观充电容量”来描述其电化学性能。CuO和Cu2O膜电极的初始视在放电容量分别达到911和570 mAh/g。尽管由于在第一次循环中形成了固体电解质界面(SEI)，CuO纳米管薄膜和Cu2O薄膜表现出了很大的不可逆容量，但它们具有良好的循环性能，30次循环后的表观容量分别为417和219mAhg。
CuO nanotube film and Cu2O film were anodically grown on Cu substrates through direct oxidation and electrochemical anodic reduction, respectively. The microstructure and morphology of the films were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The obtained CuO is monoclinic crystallization, and the diameters of tubes are about 100–300 nm, while the as-prepared Cu2O has a typical structure with a space groupPn3mand consists of compact faceted crystals. As anodes for Li-ion batteries, the electrochemical properties of the nanostructured CuO and Cu2O films were investigated by cyclic voltammogram and galvanostatic charge–discharge tests. An “apparent charge capacity” was introduced to describe the electrochemical performance. The initial apparent discharge capacity of the CuO and Cu2O film electrode reached to 911 and 570 mAh/g, respectively. Although they exhibited large irreversible capacities attributed to the formation of solid electrolyte interface (SEI) during the first cycle, the CuO nanotube film and Cu2O film had good cyclability and delivered the apparent capacity of 417 and 219 mAh/g after 30 cycles, respectively.