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Issue 7, 2020
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A nanoconfined iron(iii) fluoride cathode in a NaDFOB electrolyte: towards high-performance sodium-ion batteries

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Abstract

Iron(III) fluoride (FeF3) is considered a potential cathode for sodium-ion batteries (SIBs) due to its high capacity and low cost. However, particle pulverization upon cycling generally results in rapid degradation of its structure and capacity. Here, we introduce a free-standing nanoconfined FeF3 cathode and a novel electrolyte salt, sodium-difluoro(oxalato)borate (NaDFOB), for SIBs. The assembled cells show a high discharge capacity up to ∼230 mA h g−1 at a rate of 20 mA g−1 (∼200 mA h g−1 at 100 mA g−1) and a capacity retention up to ∼70% after 100 cycles, which represent the best results reported for FeF3 in Na-ion electrolytes. The achieved high performance can be attributed to the synergic protection provided by the nanoconfined FeF3 electrode and the NaDFOB electrolyte. Post-mortem analysis and quantum mechanics show that DFOB anions facilitated the formation of a thin cathode electrolyte interphase (CEI) on the surface of FeF3-carbon nanofibers (CNFs) via oligomerization.

Graphical abstract: A nanoconfined iron(iii) fluoride cathode in a NaDFOB electrolyte: towards high-performance sodium-ion batteries

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Supplementary files

Article information


Submitted
25 Nov 2019
Accepted
22 Jan 2020
First published
24 Jan 2020

J. Mater. Chem. A, 2020,8, 4091-4098
Article type
Paper

A nanoconfined iron(III) fluoride cathode in a NaDFOB electrolyte: towards high-performance sodium-ion batteries

Z. Sun, W. Fu, Michael. Z. Liu, P. Lu, E. Zhao, A. Magasinski, M. Liu, S. Luo, J. McDaniel and G. Yushin, J. Mater. Chem. A, 2020, 8, 4091
DOI: 10.1039/C9TA12853K

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