Mechanisms and Designs of Asymmetrical Electrochemical Capacitors

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

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.

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

• Journal Article Type: Article
• Acceptance Date: Jun 15, 2017
• Online Publication Date: Jun 28, 2017
• Publication Date: Sep 1, 2017
• Deposit Date: Jul 12, 2017
• Publicly Available Date: Jul 12, 2017
• Journal: Electrochimica Acta
• Print ISSN: 0013-4686
• Electronic ISSN: 0013-4686
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 247
• Pages: 344-357
• 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
• Public URL: https://nottingham-repository.worktribe.com/output/879708
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0013468617313269
• 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.