Supercapattery: Merit merge of capacitive and Nernstian charge storage mechanisms

Chen, George Z.

Abstract

© 2020 Elsevier B.V. Supercapattery is the generic name for hybrids of supercapacitor and rechargeable battery. Batteries store charge via Faradaic processes, involving reversible transfer of localised or zone-delocalised valence electrons. The former is governed by the Nernst equation. The latter leads to pseudocapacitance (or Faradaic capacitance) which may be differentiated from electric double layer capacitance with spectroscopic assistance such as electron spin resonance. Because capacitive storage is the basis of supercapacitors, the combination of capacitive and Nernstian mechanisms has dominated supercapattery research since 2018, covering nanostructured and compounded metal oxides and sulphides, water-in-salt and redox active electrolytes and bipolar stacks of multicells. The technical achievements so far, such as specific energy of 270 Wh/kg in aqueous electrolyte, and charging–discharging for more than 5000 cycles, benchmark a challenging but promising future of supercapattery.

Citation

Chen, G. Z. (2020). Supercapattery: Merit merge of capacitive and Nernstian charge storage mechanisms. Current Opinion in Electrochemistry, 21, 358-367. https://doi.org/10.1016/j.coelec.2020.04.002

• Journal Article Type: Review
• Acceptance Date: Apr 7, 2020
• Online Publication Date: May 6, 2020
• Publication Date: Jun 1, 2020
• Deposit Date: May 11, 2020
• Publicly Available Date: May 7, 2022
• Journal: Current Opinion in Electrochemistry
• Print ISSN: 2451-9103
• Electronic ISSN: 2451-9111
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 21
• Pages: 358-367
• DOI: https://doi.org/10.1016/j.coelec.2020.04.002
• Keywords: Supercapattery, Nernstian storage, Delocalised valence electrons, Pseudocapacitance, Bipolar electrode, Water-in-salt electrolytes, Redox active electrolytes
• Public URL: https://nottingham-repository.worktribe.com/output/4416567
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S2451910320300855?via%3Dihub