Alkali-Ion-Assisted Activation of ε-VOPO4 as a Cathode Material for Mg-Ion Batteries

Dogancan Sari; Ann Rutt; Jiyoon Kim; Qian Chen; Nathan T Hahn; Haegyeom Kim; Kristin A Persson; Gerbrand Ceder

doi:10.1002/advs.202307838

Alkali-Ion-Assisted Activation of ε-VOPO₄ as a Cathode Material for Mg-Ion Batteries

Adv Sci (Weinh). 2024 May 6:e2307838. doi: 10.1002/advs.202307838. Online ahead of print.

Authors

Dogancan Sari¹, Ann Rutt¹, Jiyoon Kim¹, Qian Chen², Nathan T Hahn³, Haegyeom Kim², Kristin A Persson^{1

2}, Gerbrand Ceder^{1

2}

Affiliations

¹ Department of Materials Science and Engineering, Berkeley, 94720, USA.
² Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.
³ Material, Physical and Chemical Sciences Center, Sandia National Laboratories, Sandia, 87185, USA.

PMID: 38711210
DOI: 10.1002/advs.202307838

Abstract

Rechargeable multivalent-ion batteries are attractive alternatives to Li-ion batteries to mitigate their issues with metal resources and metal anodes. However, many challenges remain before they can be practically used due to the low solid-state mobility of multivalent ions. In this study, a promising material identified by high-throughput computational screening is investigated, ε-VOPO₄, as a Mg cathode. The experimental and computational evaluation of ε-VOPO₄ suggests that it may provide an energy density of >200 Wh kg^-1 based on the average voltage of a complete cycle, significantly more than that of well-known Chevrel compounds. Furthermore, this study finds that Mg-ion diffusion can be enhanced by co-intercalation of Li or Na, pointing at interesting correlation dynamics of slow and fast ions.

Keywords: cathodes; diffusion; energy storage; magnesium batteries; multivalent batteries.

Abstract

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