Supercapacitor and supercapattery as emerging electrochemical energy stores

Chen, George Z.

Abstract

This article reviews critically selected recent literature on electrochemical energy storage (EES) technologies, focusing on supercapacitor and also supercapattery which is a generic term for various hybrid devices combining the merits of rechargeable battery and supercapacitor. Fundamentals of EES are explained, aiming at clarification of some literature confusions such as the differences between capacitive and non-capacitive Faradaic charge storage mechanisms, and between cathode and positive electrode (positrode), and between anode and negative electrode (negatrode). In particular, the concept and origin of pseudocapacitance are qualitatively correlated with the band model for semiconductors. Strategies for design and construction of supercapattery are discussed in terms of both the materials structures and device engineering. Selection of materials, including electrolytes, is another topic reviewed selectively. Graphenes and carbon nanotubes are the favourable choice to composite with both capacitive and non-capacitive redox materials for improved kinetics of charge storage processes and charge-discharge cycling stability. Organoaqueous electrolytes show a great potential to enable EES to work at sub-zero temperatures, whilst solid ion conducting membranes and ionic liquids can help develop high voltage (> 4.0 V) and hence high energy supercapatteries.

Citation

Chen, G. Z. (in press). Supercapacitor and supercapattery as emerging electrochemical energy stores. International Materials Reviews, 62(4), https://doi.org/10.1080/09506608.2016.1240914

• Journal Article Type: Article
• Acceptance Date: Sep 20, 2016
• Online Publication Date: Oct 17, 2016
• Deposit Date: Sep 26, 2016
• Publicly Available Date: Oct 17, 2016
• Journal: International Materials Reviews
• Print ISSN: 0950-6608
• Electronic ISSN: 1743-2804
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Volume: 62
• Issue: 4
• DOI: https://doi.org/10.1080/09506608.2016.1240914
• Keywords: Supercapattery; Supercapacitor; Capacitive and non-capacitive faradaic processes; Nanocomposite; Organoaqueous and non-aqueous electrolytes; Device engineering
• Public URL: https://nottingham-repository.worktribe.com/output/823096
• Publisher URL: http://www.tandfonline.com/doi/full/10.1080/09506608.2016.1240914
• Contract Date: Sep 26, 2016