How the electrolyte limits fast discharge in nanostructured batteries and supercapacitors
How the electrolyte limits fast discharge in nanostructured batteries and supercapacitors
Solid state and interfacial processes are not necessarily the principal rate limiting process during fast discharge of LiFePO4 composite electrodes with particle size less than 1 ?m. A simple model based on salt diffusion to a sharp discharge front explains the observed dependence of discharge rate on electrode thickness, electrolyte concentration, lithium transference number, and dilution of the active material.
The effect of changing the electrolyte is dramatic, e.g. discharge to 25% capacity was obtained on a 40 ?m thick electrode after only 4 s in an optimised electrolyte, aqueous Li2SO4, showing a rate of 900 C as compared with less than 10 C for a similar cell with an ionic liquid as the electrolyte
lithium ion battery, LiFePO4, discharge rate, electrolyte, composite electrode, transference number
2089-2092
Johns, Philip A.
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Roberts, Matthew R.
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Wakizaka, Yasuaki
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Owen, John R.
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Sanders, James H.
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November 2009
Johns, Philip A.
ec545172-cb9c-490c-8951-62f6d20dff0a
Roberts, Matthew R.
773cf85a-e589-406f-8c75-505f6930bd3d
Wakizaka, Yasuaki
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Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Sanders, James H.
f904069c-38fc-4bce-8491-a44a7523c72d
Johns, Philip A., Roberts, Matthew R., Wakizaka, Yasuaki, Owen, John R. and Sanders, James H.
(2009)
How the electrolyte limits fast discharge in nanostructured batteries and supercapacitors.
Electrochemistry Communications, 11 (11), .
(doi:10.1016/j.elecom.2009.09.001).
Abstract
Solid state and interfacial processes are not necessarily the principal rate limiting process during fast discharge of LiFePO4 composite electrodes with particle size less than 1 ?m. A simple model based on salt diffusion to a sharp discharge front explains the observed dependence of discharge rate on electrode thickness, electrolyte concentration, lithium transference number, and dilution of the active material.
The effect of changing the electrolyte is dramatic, e.g. discharge to 25% capacity was obtained on a 40 ?m thick electrode after only 4 s in an optimised electrolyte, aqueous Li2SO4, showing a rate of 900 C as compared with less than 10 C for a similar cell with an ionic liquid as the electrolyte
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Published date: November 2009
Keywords:
lithium ion battery, LiFePO4, discharge rate, electrolyte, composite electrode, transference number
Organisations:
Chemistry
Identifiers
Local EPrints ID: 153727
URI: http://eprints.soton.ac.uk/id/eprint/153727
ISSN: 1388-2481
PURE UUID: e9b21a80-eb88-4a99-a2f4-9c42821e2934
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Date deposited: 21 May 2010 10:58
Last modified: 14 Mar 2024 02:36
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Contributors
Author:
Philip A. Johns
Author:
Matthew R. Roberts
Author:
Yasuaki Wakizaka
Author:
James H. Sanders
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