Jump to main content
Jump to site search

Issue 3, 2021
Previous Article Next Article

Na2Fe2F7: a fluoride-based cathode for high power and long life Na-ion batteries

Author affiliations

Abstract

Despite the high energy density of layered-type cathode materials for Na-ion batteries, their two-dimensional crystal structure suffers a large volume change and phase transition during Na+ de/intercalation, which often results in their poor cycling performances. Thus, a robust three-dimensional framework with minimal structural change is required for stable electrochemical sodium storage. Here, we introduce an earth-abundant element-based trigonal-type Na–Fe–F compound (Na2Fe2F7) with three-dimensionally interconnected FeF6 octahedra and three-dimensional Na+ diffusion pathways. Through combined studies using first-principles calculations and experiments, we confirm that Na2Fe2F7 delivers excellent power-capability due to large three-dimensional Na+ diffusion pathways as well as ultra-long cycling performance due to negligible structural change during Na+ de/intercalation. These results will guide new insights for material discovery for high performance rechargeable batteries.

Graphical abstract: Na2Fe2F7: a fluoride-based cathode for high power and long life Na-ion batteries

Back to tab navigation

Supplementary files

Article information


Submitted
01 Sep 2020
Accepted
25 Nov 2020
First published
06 Jan 2021

Energy Environ. Sci., 2021,14, 1469-1479
Article type
Paper

Na2Fe2F7: a fluoride-based cathode for high power and long life Na-ion batteries

H. Park, Y. Lee, M. Cho, J. Kang, W. Ko, Y. H. Jung, T. Jeon, J. Hong, H. Kim, S. Myung and J. Kim, Energy Environ. Sci., 2021, 14, 1469
DOI: 10.1039/D0EE02803G

Social activity

Search articles by author

Spotlight

Advertisements