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Title

Comprehensive potentiodynamic analysis of electrodes performance in hybrid capacitors

Authors

[ 1 ] Wydział Technologii Chemicznej, Politechnika Poznańska | [ 2 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ SzD ] doctoral school student | [ P ] employee

Scientific discipline (Law 2.0)

[6.5] Chemical sciences

Year of publication

2023

Published in

Electrochemistry Communications

Journal year: 2023 | Journal volume: vol. 147

Article type

scientific article

Publication language

english

Keywords
EN
  • Potentiodynamic analysis
  • Li-ion capacitor
  • Electrodes contribution
  • Scan rate determination
Abstract

EN A methodology which assesses the potentiodynamic characteristics of individual electrodes in hybrid capacitors (HCs) is introduced, using a Li-ion capacitor (LIC) as an example. Each electrode contribution was calculated from cyclic voltammetry (CV) measurements on a cell equipped with a reference electrode by adapting the procedure for electrical double-layer capacitors. It has been confirmed that, during the potentiodynamic analysis of a hybrid capacitor, the scan rate of the electrodes (dE+/dt and dE-/dt) is not constant in time. Furthermore, dE-/dt tends to 0, while dE+/dt aims to reach the rate of the voltage sweep (dU/dt). By contrast, when the electrodes are analyzed separately at a constant potential scan rate, the voltammogram of the battery-type negative electrode does not provide the same current response as a hybrid capacitor, where only the voltage ramp is controlled. The proposed methodology is fundamental for revealing any imbalance in the contributions of the electrodes and providing a correct representation of their current profiles during the potentiodynamic analysis of a hybrid cell.

Date of online publication

13.01.2023

Pages (from - to)

107436-1 - 107436-6

DOI

10.1016/j.elecom.2023.107436

URL

https://www.sciencedirect.com/science/article/pii/S1388248123000103

Comments

Article number: 107436

License type

CC BY-NC-ND (attribution - noncommercial - no derivatives)

Open Access Mode

open journal

Open Access Text Version

final published version

Release date

13.01.2023

Date of Open Access to the publication

at the time of publication

Full text of article

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Access level to full text

public

Ministry points / journal

100.0

Impact Factor

5.443 [List 2021]

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