Fast Mg-ion insertion kinetics in V2 Se9

Wright, Matthew A., Lim, Jungwoo, Pacheco Muino, Raul A., Krowitz, Anna E., Hawkins, Cara J., Bahri, Mounib, Daniels, Luke M., Chen, Ruiyong, Gomes Chagas, Luciana, Cookson, James, and others. (2024) Fast Mg-ion insertion kinetics in V2 Se9. Journal of Materials Chemistry A, 12 (46). pp. 32349-32358. ISSN 2050-7496. E-ISSN 2050-7488. (doi:10.1039/d4ta04469j) (KAR id:107765)

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Official URL: https://doi.org/10.1039/d4ta04469j

Abstract

V2Se9 displays facile electrochemical insertion of up to 1.6 Mg2+ per unit formula with fast diffusion (coefficients of 10−10–10−12 cm2 s−1) surpassing best-in-class materials like Mo6S8. Detailed structural characterization of synchrotron X-ray diffraction data with ab initio Maximum Entropy Method analysis reveals Mg2+ insertion into octahedral sites within the large vdW space between [V4Se18]∞ chains. Fast rate performance is attributed to low structural perturbation and low diffusion barriers, calculated by bond valence pathway analysis, resulting from the low charge-per-size of anionic selenium. X-ray photoelectron spectroscopy and X-ray absorption spectroscopy reveal that reversible insertion of Mg2+ is facilitated by V5+/V3+ redox. V2Se9 demonstrates that selenides, despite their larger molecular weight, offer potential as fast-rate positive electrode materials for magnesium batteries over well-explored oxides and sulfides.

Item Type:	Article
DOI/Identification number:	10.1039/d4ta04469j
Subjects:	Q Science
Divisions:	Divisions > Division of Natural Sciences > Chemistry and Forensics
Funders:	Engineering and Physical Sciences Research Council (https://ror.org/0439y7842) Nippon Sheet Glass (United Kingdom) (https://ror.org/04j65hp39)
SWORD Depositor:	JISC Publications Router
Depositing User:	JISC Publications Router
Date Deposited:	11 Nov 2024 09:31 UTC
Last Modified:	05 Dec 2024 12:17 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/107765 (The current URI for this page, for reference purposes)

University of Kent Author Information

Chadwick, Alan V..

Creator's ORCID:	https://orcid.org/0000-0002-6485-9207
CReDIT Contributor Roles:	Funding acquisition, Resources

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