期刊
INORGANIC CHEMISTRY FRONTIERS
卷 4, 期 12, 页码 1996-2004出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7qi00463j
关键词
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资金
- Jinan Science and Technology Research Grant [201401274]
- Jining 511 Recruitment Program of Global Experts, P. R. China [2012N130]
A novel silicon-carbon composite with a 3D pore-nest structure denoted as Si@SiOx/CNTs@C was prepared and studied. The results showed that agglomeration of nano-silicon particles is effectively inhibited by the addition of a surfactant; meanwhile, surfactant pyrolytic carbon (SPC) and a relatively dense SiOx mechanical binding layer on the surface of Si magnificently restrain the volume expansion during the lithiation process and are conducive to the formation of a stable SEI film. In addition, a 3D electron pathway was constituted by CNTs, graphite and SPC on the surface of Si to enhance the conductivity. The results showed that the capacity of the Si@SiOx/CNTs@(C) composite anode can be maintained at above 1740 mA h g(-1) at a current density of 0.42 A g(-1) after 700 cycles without capacity loss compared to the initial charge capacity, which indicated the excellent cycle performance of the composite material. Furthermore, a rule of thumb has been perceived by means of CV, cell charging/discharging measurements and their differential capacity analyses, which is characteristic of an electrode made of silicon as an active material. The finding contributes to the in-depth comprehension and general elucidation of the degradation mechanism of Si-based anode materials.
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