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3D Pore-Nest Structured Silicon-Carbon Composite as Anode Material for High Performance Lithium-Ion Batteries

Abstract

A novel silicon-carbon composite with 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 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 conduce to the formation of a stable SEI film. In addition, a 3D electron pathway has been constituted of CNTs, graphite and SPC on the surface of Si to enhance the conductivity. The results displayed that the capacity of the Si@SiOx/CNTs@C composite anode can be maintained at above 1740 mAh g-1 at the 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 electrode made of silicon as an active material. The finding contributes to the in-depth comprehension and general elucidation for the degradation mechanism of Si-based anode materials.

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Publication details

The article was received on 05 Aug 2017, accepted on 28 Sep 2017 and first published on 28 Sep 2017


Article type: Research Article
DOI: 10.1039/C7QI00463J
Citation: Inorg. Chem. Front., 2017, Accepted Manuscript
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    3D Pore-Nest Structured Silicon-Carbon Composite as Anode Material for High Performance Lithium-Ion Batteries

    Y. Li, Z. Long, P. Xu, Y. Sun, K. Song, X. Zhang and S. Ma, Inorg. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QI00463J

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