A 3D pore-nest structured silicon-carbon composite as an anode material for high performance lithium-ion batteries

作者：Li, Yankai; Long, Zhi; Xu, Pengyuan; Sun, Yang; Song, Kai; Zhang, Xiaokang; Ma, Shuhua^*

来源：Inorganic Chemistry Frontiers, 2017, 4(12): 1996-2004.

DOI：10.1039/c7qi00463j

• SI/REDUCED GRAPHENE OXIDE
• X-RAY PHOTOELECTRON
• INTERFACIAL LAYER
• PHENOLIC RESIN
• BINDER-FREE
• LONG-CYCLE
• SI ANODES
• SHELL
• NANOPARTICLES
• CORE

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.

• 出版日期2017-12
• 单位济南大学