Issue 40, 2023

Multicore–shell iron fluoride@carbon microspheres as a long-life cathode for high-energy lithium batteries

Abstract

The study of multi-electron conversion cathodes is an important direction for developing next-generation rechargeable batteries. Iron fluoride (FeF3), in particular, has a high theoretical specific capacity (712 mA h g−1) and a low cost for Li storage. However, the FeF3 material suffers from poor conductivity, volume change and active material dissolution, resulting in voltage hysteresis and poor cycling and rate performance during electrochemical reactions. Here novel multicore–shell FeF3@carbon (C) composite microspheres with FeF3 nanoparticles embedded in carbon shells are developed through a bottom-up method and demonstrate smaller FeF3 particle size, a good carbon coating and superior maintenance of carbon shell integrity after fluorination and cycling as well. The FeF3@C/Li cells exhibit excellent electrochemical properties, offering a reversible capacity of 511.4 mA h g−1 at 0.2C after 250 cycles and outstanding cycle stability for 3500 cycles, with a capacity retention of 81% at 1C. It is worth noting that the carbon shell effectively inhibits the dissolution and diffusion of the active material and enhances the electrode reaction kinetics during charge/discharge reactions together with reduced core size. Overall, the sophisticatedly designed multicore–shell structure not only effectively improves the electrochemical properties of FeF3 but also offers a new idea for refining transition metal-based electrode materials.

Graphical abstract: Multicore–shell iron fluoride@carbon microspheres as a long-life cathode for high-energy lithium batteries

Supplementary files

Article information

Article type
Communication
Submitted
23 Sext 2023
Accepted
25 Sept 2023
First published
25 Sept 2023

J. Mater. Chem. A, 2023,11, 21541-21552

Multicore–shell iron fluoride@carbon microspheres as a long-life cathode for high-energy lithium batteries

Z. Jiang, Y. Wang, X. Chen, F. Chu, X. Jiang, F. Kwofie, Q. Pei, S. Luo, J. Arbiol and F. Wu, J. Mater. Chem. A, 2023, 11, 21541 DOI: 10.1039/D3TA05054H

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