Phase-transforming electrodes
Phase-transforming electrodes
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.
1451-1452
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
2014
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
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.
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e-pub ahead of print date: 26 June 2014
Published date: 2014
Organisations:
Electrochemistry
Identifiers
Local EPrints ID: 366640
URI: http://eprints.soton.ac.uk/id/eprint/366640
ISSN: 0036-8075
PURE UUID: 01d3f864-cec6-4a56-9d87-6d5ceed51417
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Date deposited: 07 Jul 2014 09:25
Last modified: 15 Mar 2024 02:52
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