Issue 8, 2023

Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation

Abstract

Interactions between electrolyte constituents and active materials strongly influence the capacity, energy density, and cycling stability of energy storage devices. In this study, the role of electrolyte dielectric on the improvement of electrochemical stability is demonstrated using activated carbon (AC) lithium-ion capacitors and symmetric AC/AC cells. 1 M LiPF6 salt is used as the electrolyte and dissolved in different binary solvent mixtures of varying dielectric properties. Floating voltage stability tests show increased floating voltage durations prior to 80% capacity retention as the electrolyte dielectric is increased in half cells and symmetric cells. The increased stability is attributed to improved PF6 anion resistance to oxidation by the enhanced surrounding dielectric and solvation sheath encompassing it at the double layer region of the AC. Post-mortem SEM, nitrogen physisorption and XPS analysis on the extracted electrodes reveal increased deposits of degradation products in the electrolyte with a lower dielectric that reduces the surface area and pores of the AC and causes the faster capacity fade.

Graphical abstract: Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation

Supplementary files

Article information

Article type
Paper
Submitted
01 févr. 2023
Accepted
17 mars 2023
First published
20 mars 2023

Sustainable Energy Fuels, 2023,7, 1846-1854

Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation

O. E. Eleri, J. Pires, F. T. Huld, S. Lu, P. Schweigart, A. M. Svensson, F. Lou and Z. Yu, Sustainable Energy Fuels, 2023, 7, 1846 DOI: 10.1039/D3SE00122A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements