Issue 16, 2023

Influence of structural modifications on the alkali ion storage properties of carbon black in hybrid ion capacitor negative electrodes

Abstract

Carbon blacks (CBs) belong to the group of graphitizable carbon materials (also referred to as soft carbons), which are well-known as negative electrodes from the early state of lithium-ion battery development and commercialization. Nowadays, they are mostly utilized as conductive additives in numerous applications related to electrochemical energy storage, rather than as active electrode materials. However, to consider these materials as conductive additives only, that do not contribute to the energy storage mechanism at all, does not live up to the opportunities these carbons offer if used as model materials to explain ion storage processes at a mechanistic level. This work sheds light on fundamental processes in hybrid ion capacitors and demonstrates how even minor structural differences in a series of CB materials alter the electrochemical behavior. Therefore, the diffusivity in different hybrid ion capacitor systems as well as varying alkali ion storage behaviors are investigated by the galvanostatic intermittent titration technique. The results reveal that the diffusion coefficients are two orders of magnitude lower in the low voltage plateau compared to the sloping region, showing that post-treated CBs suffer from diffusional limitations in sodium-ion capacitors, due to smaller graphene interlayer distances, while in lithium-ion capacitors the diffusion is not hindered, as confirmed by rate capability tests and, therefore, another factor like electric conductivity seems to be limiting.

Graphical abstract: Influence of structural modifications on the alkali ion storage properties of carbon black in hybrid ion capacitor negative electrodes

Supplementary files

Article information

Article type
Paper
Submitted
16 Maijs 2023
Accepted
16 Jūn. 2023
First published
20 Jūn. 2023

Sustainable Energy Fuels, 2023,7, 3871-3882

Influence of structural modifications on the alkali ion storage properties of carbon black in hybrid ion capacitor negative electrodes

J. Schenk, D. Leistenschneider, S. Hoeppener, U. S. Schubert, K. Schutjajew and M. Oschatz, Sustainable Energy Fuels, 2023, 7, 3871 DOI: 10.1039/D3SE00642E

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