材料科学
硅
阳极
锂(药物)
化学工程
俄歇电子能谱
碳纤维
热解
循环伏安法
纳米颗粒
涂层
碳化硅
纳米技术
电极
电化学
复合材料
光电子学
物理化学
医学
核物理学
化学
内分泌学
工程类
物理
复合数
作者
Julien Sourice,Axelle Quinsac,Y. Leconte,O. Sublemontier,Willy Porcher,Cédric Haon,Arnaud Bordes,Éric De Vito,Adrien Boulineau,Séverine Jouanneau Si Larbi,Nathalie Herlin‐Boime,C. Reynaud
摘要
Carbon-covered silicon nanoparticles (Si@C) were synthesized for the first time by a one-step continuous process in a novel two stages laser pyrolysis reactor. Crystallized silicon cores formed in a first stage were covered in the second stage by a continuous shell mainly consisting in low organized sp2 carbon. At the Si/C interface silicon carbide is absent. Moreover, the presence of silicon oxide is reduced compared to materials synthesized in several steps, allowing the use of such material as promising anode material in lithium-ion batteries (LIB). Auger Electron Spectroscopy (AES) analysis of the samples at both SiKLL and SiLVV edges proved the uniformity of the carbon coating. Cyclic voltammetry was used to compare the stability of Si and Si@C active materials. In half-cell configuration, Si@C exhibits a high and stable capacity of 2400 mAh g–1 at C/10 and up to 500 mAh g–1 over 500 cycles at 2C. The retention of the capacity is attributed to the protective effect of the carbon shell, which avoids direct contact between the silicon surface and the electrolyte.
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