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In situ one-step synthesis of a 3D nanostructured germanium-graphene composite and its application in lithium-ion batteries

Journal Article


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Abstract


  • A germanium-graphene nanocomposite material with three-dimensional nanostructures has been synthesized by an efficient one-step, in situ, and aqueous-based method. The electrochemical properties of the germanium-graphene nanocomposite have been evaluated by galvanostatic discharge-charge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy. Results show that the germanium-graphene nanocomposite has a much more stable cycling performance than that of the pure germanium, with a capacity of about 832 mA h g-1 after 50 cycles. The rate capability is also improved significantly. The superior performance is attributed to the graphene content, which increases the material's conductivity, enlarges the specific surface area, delivers enough sites to allow dispersion of the Ge nanoparticles without excessive agglomeration, and provides void space to buffer the volume change during discharge-charge cycles. © 2013 The Royal Society of Chemistry.

Publication Date


  • 2013

Citation


  • Zhong, C., Wang, J., Gao, X., Wexler, D. & Liu, H. K. (2013). In situ one-step synthesis of a 3D nanostructured germanium-graphene composite and its application in lithium-ion batteries. Journal of Materials Chemistry, 1 (36), 10798-10804.

Scopus Eid


  • 2-s2.0-84882723531

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2299&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1290

Has Global Citation Frequency


Number Of Pages


  • 6
  • 6

Start Page


  • 10798

End Page


  • 10804

Volume


  • 1

Issue


  • 36

Place Of Publication


  • United Kingdom

Abstract


  • A germanium-graphene nanocomposite material with three-dimensional nanostructures has been synthesized by an efficient one-step, in situ, and aqueous-based method. The electrochemical properties of the germanium-graphene nanocomposite have been evaluated by galvanostatic discharge-charge cycling, cyclic voltammetry, and electrochemical impedance spectroscopy. Results show that the germanium-graphene nanocomposite has a much more stable cycling performance than that of the pure germanium, with a capacity of about 832 mA h g-1 after 50 cycles. The rate capability is also improved significantly. The superior performance is attributed to the graphene content, which increases the material's conductivity, enlarges the specific surface area, delivers enough sites to allow dispersion of the Ge nanoparticles without excessive agglomeration, and provides void space to buffer the volume change during discharge-charge cycles. © 2013 The Royal Society of Chemistry.

Publication Date


  • 2013

Citation


  • Zhong, C., Wang, J., Gao, X., Wexler, D. & Liu, H. K. (2013). In situ one-step synthesis of a 3D nanostructured germanium-graphene composite and its application in lithium-ion batteries. Journal of Materials Chemistry, 1 (36), 10798-10804.

Scopus Eid


  • 2-s2.0-84882723531

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2299&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1290

Has Global Citation Frequency


Number Of Pages


  • 6
  • 6

Start Page


  • 10798

End Page


  • 10804

Volume


  • 1

Issue


  • 36

Place Of Publication


  • United Kingdom