电子元件与材料2018，Vol.37Issue(5)：29-34,6.DOI:10.14106/j.cnki.1001-2028.2018.05.005
氯化钠吸热条件下的纳米硅制备及其电化学性能
Electrochemical performance of nano-silicon prepared with sodium chloride heat-scavenger
杜建龙 1梁逵 1廖星 1阳海林1
作者信息
- 1. 湖南大学 材料科学与工程学院,湖南 长沙 410082
- 折叠
摘要
Abstract
Silicon was regarded as one of the promising anode materials for next generation lithium ion batteries(LIBs) due to its ultrahigh theoretical capacity, abundant resource and environmental friendliness. However, the downsizing of Si to nanoscale dimension was impeded by complicated and expensive methods. Here, the Si nanoparticles are engineered from a magnesiothermic reaction, in which magnesium powder and fumed silica are served as reductant and silicon source, respectively. Sodium chloride is utilized as a heat-scavenger to consume the heat, which generates by the magnesiothermic reduction process. The nano-silicon with an average grain size about 25 nm is successfully obtained, and the yield is as high as 82%. Owing to the small size of the nano-silicon, it exhibits excellent electrochemical performance. The first cycle delithiation capacity is above 1875 mAh·g-1and the first coulombic efficiency is up to 85%. Furthermore, the delithiation capacity maintains 1007 mAh·g-1at a current density of 0.6 A·g-1after 50 cycles.关键词
纳米硅/氯化钠吸热剂/镁热还原法/锂离子电池/负极材料/电化学性能Key words
nano-silicon/sodium chloride heat-scavenger/magnesiothermic reduction method/lithium ion batteries/anode materials/electrochemical properties分类
信息技术与安全科学引用本文复制引用
杜建龙,梁逵,廖星,阳海林..氯化钠吸热条件下的纳米硅制备及其电化学性能[J].电子元件与材料,2018,37(5):29-34,6.
