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Nature Research, Nature Materials, 10(10), p. 772-779, 2011

DOI: 10.1038/nmat3093

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

Journal article published in 2011 by P. Barpanda ORCID, M. Ati, B. C. Melot, G. Rousse, J.-N. Chotard, M.-L. Doublet, M. T. Sougrati ORCID, S. A. Corr, J.-C. Jumas, J.-M. Tarascon
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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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 newpolyanionic compounds that have a higher potential for the Fe2C=Fe3C 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 Mn )SO4F. Not only is this the highest voltage reported so far for the Fe2C=Fe3C 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 125mAh g1.