A 3.90 V iron-based fluorosulphate material for lithium-ion batteries crystallizing in the triplite structure

Journal Article · Thu Nov 17 00:00:00 EST 2011 · Nat. Mater.

DOI:https://doi.org/10.1038/nmat3093· OSTI ID:1026539

Barpanda, P; Ati, M; Melot, B C; Rousse, G; Chotard, J-N; Doublet, M-L; Sougrati, M T; Corr, S A; Jumas, J-C; Tarascon, J-M ^[1]

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1. CNRS-UMR

Li-ion batteries have empowered consumer electronics and are now seen as the best choice to propel forward the development of eco-friendly (hybrid) electric vehicles. To enhance the energy density, an intensive search has been made for new polyanionic compounds that have a higher potential for the Fe{sup 2+}/Fe{sup 3+} redox couple. Herein we push this potential to 3.90 V in a new polyanionic material that crystallizes in the triplite structure by substituting as little as 5 atomic per cent of Mn for Fe in Li(Fe{sub 1-{delta}}Mn{delta})SO{sub 4}F. Not only is this the highest voltage reported so far for the Fe{sup 2+}/Fe{sup 3+} redox couple, exceeding that of LiFePO{sub 4} by 450 mV, but this new triplite phase is capable of reversibly releasing and reinserting 0.7-0.8 Li ions with a volume change of 0.6% (compared with 7 and 10% for LiFePO{sub 4} and LiFeSO{sub 4}F respectively), to give a capacity of {approx}125 mA h g{sup -1}.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: FOREIGN
• OSTI ID: 1026539
• Journal Information: Nat. Mater., Vol. 10, Issue 2011
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

25 ENERGY STORAGE
CAPACITY
ENERGY DENSITY
LITHIUM IONS
ELECTRIC BATTERIES