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

DOI: 10.1038/nmat3093

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