Graphene-enhanced electrodes for scalable supercapacitors

Research output: Contribution to journalArticle

  • External authors:
  • I-Ling Tsai
  • Lewis Le Fevre
  • Bin Wang

Abstract

A scale-up process of high-rate-capability supercapacitors based on electrochemically exfoliated graphene (EEG) and hybrid activated carbon (AC)/ EEG are studied in this work. A comparison of the rate capabilities of large-scale EEG and AC/EEG-based pouch cell and commercial high-power supercapacitors are also presented in this paper. The oxygen content of the EEG used in this work is 9.6 at%, with a C/O ratio of 9.36, and the electrical conductivity is 2.68  104 Sm-1. The specific capacitance (59 Fg-1) of the EEG-based supercapacitors remained above 80% of the maximum value as the scan rate was increased from 5 mVs-1 to 1 Vs-1. Furthermore, our study reveals how the rate capability of activated carbon (AC) based supercapacitors can be improved by adding EEG into the electrodes to form a hybrid AC/EEG supercapacitor. Both the EEG-based and AC/EEG supercapacitors were scaled-up to pouch cells with capacitances of tens of farads. The electrochemical response was unchanged when scaling up from a coin cell to a pouch cell, although the specific capacitance fell slightly. The cycle performance of the AC/EEG pouch cell showed good long-term stability, with better than 95% capacitance retention after 10,000 cycles. Both the EEG and AC/EEG (with 1:1 mass ratio) pouch cells had rate capabilities that compared favourably with the commercial high-power supercapacitors.

Bibliographical metadata

Original languageEnglish
Pages (from-to)372-379
Number of pages7
JournalElectrochimica Acta
Volume257
Early online date9 Oct 2017
DOIs
Publication statusPublished - 10 Dec 2017

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