| 硅镍纳米颗粒的氢电弧等离子体制备及电化学性能研究 | |
| Synthesis and Electrochemical Study of Si-Ni Nanoparticles by Hydrogen Plasma-metal Reaction | |
| 摘要: 采用氢电弧等离子体方法成功地合成了硅镍合金纳米颗粒， 分别用透射电子显微镜(TEM)、X射线衍射(XRD)和能谱分析(EDS)的方法对其形貌、晶体结构和元素化学成分进行了表征，结果显示得到的纳米颗粒由Si和Si2Ni两相组成。电化学测量的结果表明，在锂嵌入硅镍纳米颗粒的过程中，硅充当活性中心，形成了非晶态的LixSi合金，并且在以后的循环中一直保持非晶状态，而其中的Si2Ni作为惰性成分，不与Li反应，而是充当缓冲基体及导电剂的作用。硅镍合金纳米颗粒的可逆容量达1 304 mAh·g-1，并且循环性能明显优于纯硅材料。硅镍合金纳米颗粒与石墨组成的复合材料，不但具有较高的可逆比容量，而且有较好的循环稳定性，20次循环后比容量仍为518 mAh·g-1，容量保持率为86％,是有希望的锂离子电池负极材料。 | |
| 关键词: 纳米材料 硅镍合金 锂离子电池 负极材料 | |
| 基金项目: | |
| Abstract: Si-Ni alloy Nanoparticles have been prepared by hydrogen plasma reaction as anode materials of a lithium ion battery. The morphology, crystal structure and chemical composition of the nanoparticles obtained in this study were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD). During lithium insertion into the alloy electrodes, Si acts as an active centre, reacting with Li to form amorphous LixSi alloys，while the Si2Ni in the material plays the role of matrix as an inertia phase, which can buffer silicon volume expansion and raise electric conductivity among silicon particles. A high lithium storage capacity of 1 304 mAh·g-1 is observed for the Si-Ni alloy, with some reversibility. The composite powder consisted of Si-Ni nanoparticles and graphite has high reversible specific capacity and good cycling stability. Electrochemical cycling tests show that the capacity retention at the 20 th cycle is 86%, and specific capacity is 518 mAh·g-1. | |
| Keywords: nanomaterial Si-Ni alloy lihium ion battery anode material | |
| 摘要点击次数: 1360 | |
| 全文下载次数: 1840 | |
| 王 忠,田文怀,刘小鹤,廖复辉,刘 洋,李星国.硅镍纳米颗粒的氢电弧等离子体制备及电化学性能研究[J].无机化学学报,2006,22(4):661-665. | |
| 查看全文 查看/发表评论 下载PDF阅读器 | |
| Support information: | |
|
| |
|
| |
|
| |