Published in

American Association for the Advancement of Science, Science, 6191(344), p. 1451-1452, 2014

DOI: 10.1126/science.1255819

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Phase-transforming electrodes

Journal article published in 2014 by John R. Owen, Andrew L. Hector ORCID
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

Lithium iron phosphate (LiFePO4) is one of the cheapest and safest materials used as the positive electrode of the lithium ion battery. Since its discovery in 1996 (1), the material has been a subject of debate regarding its outstanding performance in high-rate discharge-charge cycling applications. The surprisingly high performance is attained despite the miscibility gap (the composition range at which solutions become supersaturated and tend to separate into concentrated and dilute phases—like clear honey that partially crystallizes in the refrigerator) and phase transformation that complicates lithium insertion and extraction in this material. Such properties are typically associated with slow rates of electrical charge and discharge and even structural damage during cycling. On page 1480 of this issue, Liu et al. (2) provide experimental evidence to support new theoretical models (3, 4) that bypass the miscibility gap so that the phase transformation need not happen after all.