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Ultrasonication fabrication of high quality multilayer graphene flakes and their characterization as anodes for lithium ion batteries

Elsevier B.V.
DOI: 10.1016/j.diamond.2012.07.011
  • Graphene Flake
  • Ultrasonication
  • Lithium Ion Battery
  • Intercalation


Abstract Ultrasonication of graphite nanoplatelets for 10min to 10h produced multilayer graphene flakes (GFs) with average lateral sizes of 4.5–1.0μm and as few as four stacked layers. Raman and X-ray photoelectron spectroscopies of GFs fabricated using a short sonication time (1h) indicated that their qualities were quite high, probably due to a low level of introduced defects and their presence mainly at the edges of the GFs. Characterization of GFs used as the anodes of lithium ion batteries revealed a large reversible capacity of 597mAh/g in the first cycle and a good cycle characteristic in the second to tenth cycles. Unlike the reported behaviors of graphene nanosheets and nanoribbons, reversible lithiation and delithiation were governed by intercalation and deintercalation.

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