Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
Department of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, South Korea.
J Colloid Interface Sci. 2017 Sep 1;501:133-141. doi: 10.1016/j.jcis.2017.04.048. Epub 2017 Apr 18.
In the present study, a metal-organic framework (MOF) derived from a facile water-assisted green precipitation technique is employed to synthesize phase-pure cobalt vanadate (CoVO, CVO) anode for lithium-ion battery (LIB) application. The material obtained by this eco-friendly method is systematically characterized using various techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N adsorption-desorption measurements. By using as an anode, an initial discharge capacity of 1640mAhg and a reversible capacity of 1194mAhg are obtained at the applied current densities after the 240th cycle (2Ag for 200 cycles followed by 0.2Ag for 40 cycles). Moreover, a reversible capacity as high as 962mAhg is retained at high current densities even after 240 cycles (4Ag for 200 cycles followed by 2Ag for 40 cycles), revealing the long life stability of the electrode. Significantly, CVO anode composed of fine nanoparticles (NPs) registered a substantial rate performance and reversible specific capacities of 275, 390, 543 and 699mAhg at high reversibly altered current densities of 10, 5, 2, and 1Ag, respectively.
在本研究中，采用简便的水辅助绿色沉淀技术制备了一种金属有机骨架（MOF），用于合成纯相钴钒酸盐（CoVO，CVO）作为锂离子电池（LIB）的阳极材料。通过这种环保方法获得的材料，采用粉末 X 射线衍射（PXRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和 N2 吸附-脱附测量等多种技术进行了系统的表征。将其用作阳极，在 240 次循环后（2Ag 循环 200 次，然后 0.2Ag 循环 40 次），在应用电流密度下可获得 1640mAhg 的初始放电容量和 1194mAhg 的可逆容量。此外，即使在 240 次循环后（2Ag 循环 200 次，然后 2Ag 循环 40 次），在高电流密度下仍能保持高达 962mAhg 的可逆容量，显示出电极的长寿命稳定性。值得注意的是，由细纳米颗粒（NPs）组成的 CVO 阳极表现出显著的倍率性能和可逆比容量，在高可逆电流密度为 10、5、2 和 1Ag 时，分别为 275、390、543 和 699mAhg。
