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A 3.90 V iron-based fluorosulphate material for lithium-ion batteries crystallizing in the triplite structure
Authors:
P.
Barpanda
(Université de Picardie Jules Verne)
,
M.
Ati
(Université de Picardie Jules Verne)
,
Brent
Melot
(University of Kent at Canterbury)
,
G.
Rousse
(Université Pierre et Marie Curie)
,
J-n.
Chotard
(Université de Picardie Jules Verne)
,
M-l.
Doublet
(Université Montpellier 2)
,
M. T.
Sougrati
(Université Montpellier 2)
,
Serena
Corr
(University of Kent at Canterbury)
,
J-c.
Jumas
(Université Montpellier 2)
,
J-m.
Tarascon
(ALISTORE-European Research Institute)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Nature Materials
State:
Published (Approved)
Published:
August 2011
Abstract: 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 Fe2+/Fe3+ redox couple. Herein we push this potential to 3.90V 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(Fe1−δMnδ)SO4F. Not only is this the highest voltage reported so far for the Fe2+/Fe3+ redox couple, exceeding that of LiFePO4 by 450mV, 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 LiFePO4 and LiFeSO4F respectively), to give a capacity of ~125mAhg^-1.
Subject Areas:
Chemistry,
Energy
Instruments:
B18-Core EXAFS
Added On:
30/08/2011 09:16
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