Issue 32, 2023

Covalent netting restrains dissolution enabling stable high-loading and high-rate iron difluoride cathodes

Abstract

Metal fluoride conversion cathodes are promising for the production of cheap, sustainable, and high-energy lithium-ion batteries. Yet, such systems are plagued by active material dissolution that causes capacity fade and hinders commercialization. Here, a covalent netting strategy is proposed to overcome this hurdle. In a proof-of-concept design, polydopamine derived carbon-mediated covalent binding inhibited the dissolution, while the pyrolyzed bacterial cellulose netting structure furnished fast electronic and ionic transport pathways. We demonstrate high-capacity, high-rate and long-lasting stability attained at practical loading levels. Our investigations suggest that the covalent netting-enabled formation of a robust and efficient blocking layer, highly competent in suppressing the leaching, is key for a stable performance. The successful stabilization of metal difluorides in the absence of electrolyte engineering opens an avenue for their practical deployment in future higher-level but lower-cost batteries, and provides a solution to similar challenges encountered by other dissolving energy electrode materials.

Graphical abstract: Covalent netting restrains dissolution enabling stable high-loading and high-rate iron difluoride cathodes

Supplementary files

Article information

Article type
Paper
Submitted
10 mai 2023
Accepted
14 jul 2023
First published
01 aug 2023

Nanoscale, 2023,15, 13272-13279

Covalent netting restrains dissolution enabling stable high-loading and high-rate iron difluoride cathodes

W. Xu, Y. Ma, D. Wang, S. Zhang, M. Hamza, L. Zhi, L. Li and X. Li, Nanoscale, 2023, 15, 13272 DOI: 10.1039/D3NR02161K

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