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

Barpanda, P., Ati, M., Melot, B.C., Rousse, G., Chotard, J.-N., Doublet, M.-L., Sougrati, M.T., Corr, S.A., Jumas, J.-C. and Tarascon, J.-M. (2011) A 3.90V iron-based fluorosulphate material for lithium-ion batteries crystallizing in the triplite structure. Nature Materials, 10(10), pp. 772-779. (doi: 10.1038/nmat3093)

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 3.90 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(Fe1−δMnδ)SO4F. Not only is this the highest voltage reported so far for the Fe2+/Fe3+ redox couple, exceeding that of LiFePO4 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 LiFePO4 and LiFeSO4F respectively), to give a capacity of ~125 mA h g−1.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Corr, Professor Serena
• Authors: Barpanda, P., Ati, M., Melot, B.C., Rousse, G., Chotard, J.-N., Doublet, M.-L., Sougrati, M.T., Corr, S.A., Jumas, J.-C., and Tarascon, J.-M.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Nature Materials
• ISSN: 1476-1122
• Published Online: 21 August 2011