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A 3.6 V lithium-based fluorosulphate insertion positive electrode for lithium-ion batteries

A 3.6 V lithium-based fluorosulphate insertion positive electrode for lithium-ion batteries Li-ion batteries have contributed to the commercial success of portable electronics, and are now in a position to influence higher-volume applications such as plug-in hybrid electric vehicles. Most commercial Li-ion batteries use positive electrodes based on lithium cobalt oxides. Despite showing a lower voltage than cobalt-based systems (3.45 V versus 4 V) and a lower energy density, LiFePO4 has emerged as a promising contender owing to the cost sensitivity of higher-volume markets. LiFePO4 also shows intrinsically low ionic and electronic transport, necessitating nanosizing and/or carbon coating. Clearly, there is a need for inexpensive materials with higher energy densities. Although this could in principle be achieved by introducing fluorine and by replacing phosphate groups with more electron-withdrawing sulphate groups, this avenue has remained unexplored. Herein, we synthesize and show promising electrode performance for LiFeSO4F. This material shows a slightly higher voltage (3.6 V versus Li) than LiFePO4 and suppresses the need for nanosizing or carbon coating while sharing the same cost advantage. This work not only provides a positive-electrode contender to rival LiFePO4, but also suggests that broad classes of fluoro-oxyanion materials could be discovered. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Materials Springer Journals

A 3.6 V lithium-based fluorosulphate insertion positive electrode for lithium-ion batteries

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References (29)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Nature Publishing Group
Subject
Materials Science; Materials Science, general; Optical and Electronic Materials; Biomaterials; Nanotechnology; Condensed Matter Physics
ISSN
1476-1122
eISSN
1476-4660
DOI
10.1038/nmat2590
Publisher site
See Article on Publisher Site

Abstract

Li-ion batteries have contributed to the commercial success of portable electronics, and are now in a position to influence higher-volume applications such as plug-in hybrid electric vehicles. Most commercial Li-ion batteries use positive electrodes based on lithium cobalt oxides. Despite showing a lower voltage than cobalt-based systems (3.45 V versus 4 V) and a lower energy density, LiFePO4 has emerged as a promising contender owing to the cost sensitivity of higher-volume markets. LiFePO4 also shows intrinsically low ionic and electronic transport, necessitating nanosizing and/or carbon coating. Clearly, there is a need for inexpensive materials with higher energy densities. Although this could in principle be achieved by introducing fluorine and by replacing phosphate groups with more electron-withdrawing sulphate groups, this avenue has remained unexplored. Herein, we synthesize and show promising electrode performance for LiFeSO4F. This material shows a slightly higher voltage (3.6 V versus Li) than LiFePO4 and suppresses the need for nanosizing or carbon coating while sharing the same cost advantage. This work not only provides a positive-electrode contender to rival LiFePO4, but also suggests that broad classes of fluoro-oxyanion materials could be discovered.

Journal

Nature Materials – Springer Journals

Published: Nov 29, 2009

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