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Preparation of kraft lignin-based activated carbon fiber electrodes for electric double layer capacitors using an ionic liquid electrolyte

Authors
  • Pakkang, Nutthira1
  • Kumar, Manish1
  • Taira, Shogo1
  • Koda, Keiichi1
  • Shigetomi, Kengo1
  • Uraki, Yasumitsu1
  • 1 Hokkaido University, Japan , (Japan)
Type
Published Article
Journal
Holzforschung
Publisher
De Gruyter
Publication Date
May 29, 2020
Volume
74
Issue
6
Pages
577–588
Identifiers
DOI: 10.1515/hf-2019-0291
Source
De Gruyter
Keywords
License
Yellow

Abstract

This article demonstrates the development of activated carbon fiber electrodes produced from hardwood kraft lignin (HKL) to fabricate electric double layer capacitors (EDLCs) with high energy and power densities using an ionic liquid (IL) electrolyte. A mixture solution of HKL, polyethylene glycol as a sacrificial polymer, and hexamethylenetetramine as a crosslinker in dimethylformamide/acetic acid (6/4) was electrospun, and the obtained fibers were easily thermostabilized, followed by carbonization and steam activation to yield activated carbon fibers (ACFs). The electrochemical performance of EDLCs assembled with the ACFs, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) as an IL electrolyte and a cellulosic separator was insufficient due to the low conductivity of the electrode. The conductivity of the electrode was improved successfully by spraying conductive carbon black (CB) onto the fibers mat during electrospinning. The CB containing electrodes with improved conductivity gave the resulting EDLCs a higher electrochemical performance, with an energy density of 91.5 Wh kg−1 and a power density of 76.2 kW kg−1.

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