Issue 7, 2024

Unveiling the adsorption tendency of film-forming additives to enable fast-charging hard carbon anodes with regulated Li plating

Abstract

Regulating lithium (Li) plating with high reversibility on hard carbon (HC) anodes is a practical approach to breaking through the bottleneck of the fast-charging lithium-ion batteries (LIBs). However, the solid electrolyte interphase (SEI) working in the complex interfacial Li intercalation/deposition processes is unstable, leading to unsafe Li plating with rapid capacity fading. Herein, we gauge the adsorption tendency of film-forming additives (ethylene carbonate (EC) and fluoroethylene carbonate (FEC)) on a carbon matrix containing defect features, thus achieving a robust SEI for HC to facilitate uniform and reproducible Li plating. The results demonstrate that the tilted conformation of FEC induced by the asymmetric electrostatic interaction leads to weaker adsorption between the C[double bond, length as m-dash]O of FEC and the defect site compared to that of EC. Therefore, the FEC encourages the SEI with more uniform and excellent space continuity irrespective of the distribution of the defect on the HC. Combined with local high-concentration electrolyte systems, the FEC-assisted SEI is excellent in regulating the Li plating morphology and maintaining self-structural stability over cycling. Under Li plating occupation greater than 16%, an average Coulombic efficiency (CE) of 99.8% for the HC anode over 250 cycles is retained by FEC, while that for the EC system is merely 97.9%. These findings are helpful in guiding the selection of film-forming additives for different anodes in achieving reversible Li plating for fast-charging LIBs.

Graphical abstract: Unveiling the adsorption tendency of film-forming additives to enable fast-charging hard carbon anodes with regulated Li plating

Supplementary files

Article information

Article type
Paper
Submitted
09 yan 2024
Accepted
01 mar 2024
First published
06 mar 2024
This article is Open Access
Creative Commons BY-NC license

Energy Environ. Sci., 2024,17, 2500-2511

Unveiling the adsorption tendency of film-forming additives to enable fast-charging hard carbon anodes with regulated Li plating

Y. Dong, Y. Chen, X. Yue and Z. Liang, Energy Environ. Sci., 2024, 17, 2500 DOI: 10.1039/D4EE00119B

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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