阳极
锂(药物)
化学气相沉积
材料科学
纳米颗粒
电化学
硅
涂层
化学工程
碳纤维
乙炔
纳米技术
图层(电子)
化学
电极
冶金
复合材料
有机化学
内分泌学
物理化学
工程类
复合数
医学
作者
Jinglu Yu,Jun Yang,Xuejiao Feng,Hao Jia,Jiulin Wang,Wei Lu
摘要
A uniform carbon layer was coated on Si nanoparticles by the dynamic chemical vapor deposition (CVD) process with toluene as the carbon source. The carbon layer thickness could easily be adjusted by controlling the preparation conditions. Samples selected from different positions of the reaction tube showed a small deviation in carbon content. As an anode material for a lithium-ion battery, the resulting Si@C composites exhibited better cycle reversibility and rate capability than pristine Si. The Si@C-2 sample (carbon layer thickness ≈ 12 nm) delivered a relatively stable specific capacity of ca. 1600 mA h g–1 at 0.3 A g–1 for 70 cycles. Its capacity remained at 750 mA h g–1 at 5 A g–1, compared with 240 mA h g–1 for pristine Si. Acetylene as a carbon source can also lead to superior cycle stability. This reformative CVD process provides an avenue for the large-scale production of uniform carbon coating materials used for batteries and other devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI