Issue 33, 2024

Quantification probing of available extra capacity: interfacial space-charge storage in FeOOH lithium-ion batteries

Abstract

Extra capacity beyond a theoretically predicted value has been widely acknowledged in transition metal-based anodes for application in lithium batteries, but the precise definition of their charge storage behaviors remains elusive owing to the intricate and dynamic interior space. Herein, an urchin-like FeOOH nanostructure is fabricated to reveal the dynamic electrochemical evolution of extra capacity. It is found that electrons continually accumulate at the interface between Fe and the Li2O/LiOH matrix at a narrow discharge voltage range of 1–0 V, forming a space-charge storage region, thus enabling extra capacity besides the capacity from the reversible conversion reaction. Moreover, using advanced operando magnetometry technology, the significant interfacial space-charge storage behavior could be accurately quantified to be 239.1 mA h g−1. In contrast, the evolution of the partially reversible solid-state electrolyte interface (SEI) functions as a diminished additional source of capacity, significantly lowering the coulombic efficiency and stability of batteries. Further, by fully exploiting the potential of the reversible interfacial space-charge storage mechanism, a well-designed lithium-ion hybrid capacitor is constructed using a reduced FeOOH anode and commercial AC cathode, achieving a high energy density of 140.4 W h kg−1 and a remarkable capacity retention of ∼100% after 1000 cycles at 1 A g−1. This study offers a broad insight into the extended utilization of extra capacity, paving the way for a sustainable strategy in the development of new energy batteries.

Graphical abstract: Quantification probing of available extra capacity: interfacial space-charge storage in FeOOH lithium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
01 Apr 2024
Accepted
15 Jul 2024
First published
29 Jul 2024

J. Mater. Chem. A, 2024,12, 21873-21883

Quantification probing of available extra capacity: interfacial space-charge storage in FeOOH lithium-ion batteries

L. Zhang, Z. Bu, H. Fu, X. Wang, X. Meng, M. Liu, Y. Zhou, X. Sui, G. Chen, Q. Li and Q. Li, J. Mater. Chem. A, 2024, 12, 21873 DOI: 10.1039/D4TA02174F

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