Electrochemical properties of negative SiMox electrodes deposited on a roughened substrate for rechargeable lithium batteries
Electrochemical properties of negative SiMox electrodes deposited on a roughened substrate for rechargeable lithium batteries
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DOI：
10.1016/j.jpowsour.2009.05.047
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发表时间：
2009-12
影响因子：
9.2
通讯作者：
Chang-Mook Hwang;Chae-Ho Lim;Jae-Hoon Yang;Jong-Wan Park
中科院分区：
文献类型：
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作者：
Chang-Mook Hwang;Chae-Ho Lim;Jae-Hoon Yang;Jong-Wan Park
为了取代传统的碳，硅已被广泛提议作为锂离子电池的下一代负极（阳极）材料。在这项研究中，Si和SiMox合金沉积的RF磁控溅射系统是通过X射线衍射，非原位拉曼光谱和透射电子显微镜研究。进行了电化学测试和四种不同的Si和SiMox合金电极，其结构和纹理特性的X射线光电子能谱表征。利用场发射扫描电子显微镜观察了电极的表面形貌。通过循环测试和电化学阻抗谱研究了电极的电化学性能。结果表明，粗铜箔和钼作为合金材料有助于硅保持其放电容量，并克服充放电过程中的体积膨胀。在几个循环之后，Si电极严重地损失容量，而SiMox合金电极显示出良好的循环保持性和高容量。SiMo 0.79电极的初始容量为1319mAhg− 1，100次循环后降至1180mAhg− 1（89.4%）。
To replace conventional carbon, silicon has been widely proposed as a next-generation negative electrode (anode) material for lithium-ion batteries. In this study, Si and SiMox-alloy deposited by an RF-magnetron sputtering system is investigated by means of X-ray diffraction, ex situ Raman spectroscopy and transmission electron microscopy. Electrochemical tests are conducted and four different Si and SiMox-alloy electrodes and their structures and textual properties are characterized with X-ray photoelectron spectroscopy. The surface morphologies of the electrodes are also observed using field-emission scanning electron microscopy. The electrochemical properties of the electrodes are examined through cycling tests and electrochemical impedance spectroscopy. The results show that rough Cu foil and Mo as alloy materials help Si to retain its discharge capacity and overcome volume expansion during charging and discharging. After a few cycles, the Si electrode severely loses capacity, whereas the SiMox-alloy electrodes display good cycle retention and high capacity. The SiMo0.79electrode gives an initial capacity of 1319mAhg−1that decreases to 1180mAhg−1after 100 cycles (89.4%).