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Chemical dealloying synthesis of porous silicon anchored by in situ generated graphene sheets as anode material for lithium-ion batteries

A novel one-pot chemical dealloying method has been developed to prepare nanocomposite of reduced graphene oxide (RGO) and silicon dendrite from cheap commercial Al–Si eutectic precursor. The RGO anchoring could act as both conductive agent and buffer layer for Si volume change in the application of...

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Bibliographic Details
Published in:Journal of power sources 2015-08, Vol.287, p.177-183
Main Authors: Feng, Jinkui, Zhang, Zhen, Ci, Lijie, Zhai, Wei, Ai, Qing, Xiong, Shenglin
Format: Article
Language:English
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Summary:A novel one-pot chemical dealloying method has been developed to prepare nanocomposite of reduced graphene oxide (RGO) and silicon dendrite from cheap commercial Al–Si eutectic precursor. The RGO anchoring could act as both conductive agent and buffer layer for Si volume change in the application of lithium ion batteries (LIBs). The Si/RGO composites show an initial reversible capacity of 2280 mAh g−1, excellent capacity retention of 1942 mAh g−1 even after 100 cycles, and a high capacity of 1521 mAh g−1 even at the rate of 4000 mA g−1. Electrochemical impedance spectroscopy (EIS) measurement proved that Si/RGO composite has the lower charge transfer resistance. This work proposes an economic and facile method to prepare silicon based anode material for next generation LIBs with high energy density. •Well-assembled Si/RGO nanocomposites were prepared by a facile one-pot chemical de-alloying method.•GO was in-situ reduced to graphene sheets by the waste of H2 gas during the acid de-alloying process.•The porous RGO incorporation greatly enhanced the electrochemical performance of porous Si.•EIS and Ex-situ SEM were performed to study the mechanism of the performance enhancement.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2015.04.051