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Mechanisms and Designs of Asymmetrical Electrochemical Capacitors

Akinwolemiwa, Bamidele; Wei, Chaohui; Chen, George Z.

Authors

Bamidele Akinwolemiwa

Chaohui Wei

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GEORGE CHEN GEORGE.CHEN@NOTTINGHAM.AC.UK
Professor of Electrochemical Technologies



Abstract

© 2017 Elsevier Ltd Different charge storage mechanisms in electrochemical energy storage devices are reviewed, including non-Faradaic capacitive, Faradaic capacitive, Faradaic non-capacitive, and their combinations. Specifically, Faradaic capacitive (pseudocapacitive) storage and Faradaic non-capacitive (Nernstian) storage are attributed to the transfer of delocalised and localised valence electrons, respectively. Mathematical and graphical expressions of the respective storage performances are presented. The account is made especially for asymmetrical electrochemical capacitors (AECs), supercapattery and supercabattery. Both hypothetical and experimental examples are presented to demonstrate the merits of supercapattery that combines capacitive and Nernstian electrodes. Enhanced storage performance is shown by properly pairing and balancing the properties of the negatrode (negative electrode) and positrode (positive electrode) in the AEC or supercapattery. In addition, the design, laboratory manufacturing and performance of several stacks of bipolarly connected AEC cells are assessed in terms of commercial feasibility and promise.

Journal Article Type Article
Publication Date Sep 1, 2017
Journal Electrochimica Acta
Print ISSN 0013-4686
Electronic ISSN 0013-4686
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 247
Pages 344-357
APA6 Citation Akinwolemiwa, B., Wei, C., & Chen, G. Z. (2017). Mechanisms and Designs of Asymmetrical Electrochemical Capacitors. Electrochimica Acta, 247, 344-357. https://doi.org/10.1016/j.electacta.2017.06.088
DOI https://doi.org/10.1016/j.electacta.2017.06.088
Keywords Asymmetrical electrochemical capacitors; Supercapattery; Charge storage mechanisms; Pseudocapacitance; Delocalised valence electrons; Nernstian storage
Publisher URL http://www.sciencedirect.com/science/article/pii/S0013468617313269
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0
Additional Information This article is maintained by: Elsevier; Article Title: Mechanisms and Designs of Asymmetrical Electrochemical Capacitors; Journal Title: Electrochimica Acta; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.electacta.2017.06.088; Content Type: article; Copyright: © 2017 Elsevier Ltd. All rights reserved.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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