Chemically activated graphene/porous Si@SiOx composite as anode for lithium ion batteries

Chemically activated graphene/porous Si@SiOx (CAG/Si@SiOx) composite has been synthesized via magnesiothemic reduction of mesoporous SiO2 (MCM-48) to porous Si@SiOx and dispersing in the suspension of chemically activated graphene oxide (CAGO) followed by thermal reduction. The porous Si@SiOx partic...

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Bibliographic Details
Published in:Materials chemistry and physics 2014-10, Vol.147 (3), p.528-534
Main Authors: Tao, Hua-Chao, Yang, Xue-Lin, Zhang, Lu-Lu, Ni, Shi-Bing
Format: Article
Language:English
Subjects:
Chemical synthesis
Composite materials
Electrochemical properties
Electrochemical techniques
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Summary:Chemically activated graphene/porous Si@SiOx (CAG/Si@SiOx) composite has been synthesized via magnesiothemic reduction of mesoporous SiO2 (MCM-48) to porous Si@SiOx and dispersing in the suspension of chemically activated graphene oxide (CAGO) followed by thermal reduction. The porous Si@SiOx particles are well encapsulated in chemically activated graphene (CAG) matrix. The resulting CAG/Si@SiOx composite exhibits a high reversible capacity and excellent cycling stability up to 763 mAh g−1 at a current density of 100 mA g−1 after 50 cycles. The porous structure of CAG layer and Si@SiOx is beneficial to accommodate volume expansion of Si during discharge and charge process and the interconnected CAG improves the electronic conductivity of composite. •Chemically activated graphene encapsulated porous Si composite was prepared.•The graphene offers a continuous electrically conductive network.•The porous structure can accommodate volume expansion of Si-based materials.•The composite exhibits excellent lithium storage performance.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2014.05.026