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发表时间：2018-01-01

发表刊物：功能材料

卷号：49

期号：1

页面范围：1191-1196

ISSN号：1001-9731

摘要：A novel Si nanowires (NWs)were synthesized by a transient VLS mechanism through DC arc dis-charge plasma,witch evaporated the bulk target of Si/Fe micron powder mixture in hydrogen/argon atmos-phere.The TEM results indicate that the disordered network of Si NWs are formed with small FeSi2 particles at their tips,which is the general character of conventional VLS mechanism grown one-dimentional structure.The Si NWs have uniform morphology with about 20 nm in diameter and 100 nm in length.XRD results show that the main phase of the product is silicon,and the diffraction peak of (111 )surface is the strongest.Combining TEM image analysis,it can be concluded that the Si nanowires grow along (111)crystal surface.EDS spectrum analysis results show that the content of Si in nano powder is 97.4 wt％ and Fe content is 2.6 wt％.As an active material for anode of Li-ion batteries,the lithiation/deliatiation electrochemical properties of Si NWs were in-vestigated.Better performances of an initial discharge capacity of 1704 mAh/g and a reversible capacity of 514 mAh/g after 50 cycles at 150 mA/g were detected.The Si NWs anode also exhibits good rate performance. When the current was restored from 1 to 0.1 A/g,the capacity increased to 802 mAh/g,showing that after the charge and discharge of high rate,the electrode still keeps the original microstructure and excellent charging and discharging performance.The transient VLS mechanism-dominant Si NWs are significant in cost advantage, easy operation,industrial scale production as well the application in high-performance lithium ion battery.

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