Issue 12, 2018

Carbon dioxide as a green carbon source for the synthesis of carbon cages encapsulating porous silicon as high performance lithium-ion battery anodes

Abstract

Si/C composite is one of the most promising candidate materials for next-generation lithium-ion battery anodes. Herein, we demonstrate the novel structure of carbon cages encapsulating porous Si synthesized by the reaction between magnesium silicide (Mg2Si) and carbon dioxide (CO2) and subsequent acid washing. Benefitting from the in situ deposition through magnesiothermic reduction of CO2, the carbon cage seals the inner Si completely and shows higher graphitization than that obtained from the decomposition of acetylene. After removing MgO, pores are created, which can accommodate the volume change of the Si anode during the charge/discharge process. As the anode material for lithium-ion batteries, the porous Si/C electrode shows a charge capacity of ∼1124 mA h g−1 after 100 cycles with 86.4% capacity retention at the current density of 0.4 A g−1. When the current density increases to 1.6 and 3.2 A g−1, the capacity can still be maintained at ∼860 and ∼460 mA h g−1, respectively. The prominent cycling and rate performance is contributed by the built-in space for Si expansion, static carbon cages that prevent penetration of electrolyte and stabilize the solid electrolyte interface (SEI) outside, and fast charge transport by the novel structure.

Graphical abstract: Carbon dioxide as a green carbon source for the synthesis of carbon cages encapsulating porous silicon as high performance lithium-ion battery anodes

Supplementary files

Article information

Article type
Paper
Submitted
24 Dec 2017
Accepted
22 Feb 2018
First published
02 Mar 2018

Nanoscale, 2018,10, 5626-5633

Carbon dioxide as a green carbon source for the synthesis of carbon cages encapsulating porous silicon as high performance lithium-ion battery anodes

Y. Zhang, N. Du, Y. Chen, Y. Lin, J. Jiang, Y. He, Y. Lei and D. Yang, Nanoscale, 2018, 10, 5626 DOI: 10.1039/C7NR09599F

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