Effect of sheet morphology on the scalability of graphene-based ultracapacitors

Jiayan Luo, Hee Dong Jang*, Jiaxing Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

393 Scopus citations

Abstract

Graphene is considered a promising ultracapacitor material toward high power and energy density because of its high conductivity and high surface area without pore tortuosity. However, the two-dimensional (2D) sheets tend to aggregate during the electrode fabrication process and align perpendicular to the flow direction of electrons and ions, which can reduce the available surface area and limit the electron and ion transport. This makes it hard to achieve scalable device performance as the loading level of the active material increases. Here, we report a strategy to solve these problems by transforming the 2D graphene sheet into a crumpled paper ball structure. Compared to flat or wrinkled sheets, the crumpled graphene balls can deliver much higher specific capacitance and better rate performance. More importantly, devices made with crumpled graphene balls are significantly less dependent on the electrode mass loading. Performance of graphene-based ultracapacitors can be further enhanced by using flat graphene sheets as the binder for the crumpled graphene balls, thus eliminating the need for less active binder materials.

Original languageEnglish (US)
Pages (from-to)1464-1471
Number of pages8
JournalACS nano
Volume7
Issue number2
DOIs
StatePublished - Feb 26 2013

Keywords

  • aerosol
  • aggregation
  • crumpling
  • graphene
  • loading level
  • scalability
  • ultracapacitor

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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