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

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Title: Preparation of kraft lignin-based activated carbon fiber electrodes for electric double layer capacitors using an ionic liquid electrolyte
Authors: Pakkang, Nutthira Browse this author
Kumar, Manish Browse this author
Taira, Shogo Browse this author
Koda, Keiichi Browse this author →KAKEN DB
Shigetomi, Kengo Browse this author →KAKEN DB
Uraki, Yasumitsu Browse this author →KAKEN DB
Keywords: conductive carbon black
electric double layer capacitor
hardwood kraft lignin
ionic liquid electrolyte
Issue Date: 30-May-2020
Publisher: Walter de Gruyter
Journal Title: Holzforschung
Volume: 74
Issue: 6
Start Page: 577
End Page: 588
Publisher DOI: 10.1515/hf-2019-0291
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).
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浦木 康光

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