The University of Southampton
University of Southampton Institutional Repository

How the electrolyte limits fast discharge in nanostructured batteries and supercapacitors

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
1388-2481
2089-2092
Johns, Philip A.
ec545172-cb9c-490c-8951-62f6d20dff0a
Roberts, Matthew R.
773cf85a-e589-406f-8c75-505f6930bd3d
Wakizaka, Yasuaki
9f2f9f8c-0d24-493c-9064-0a82a6173460
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Sanders, James H.
f904069c-38fc-4bce-8491-a44a7523c72d
Johns, Philip A.
ec545172-cb9c-490c-8951-62f6d20dff0a
Roberts, Matthew R.
773cf85a-e589-406f-8c75-505f6930bd3d
Wakizaka, Yasuaki
9f2f9f8c-0d24-493c-9064-0a82a6173460
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), 2089-2092. (doi:10.1016/j.elecom.2009.09.001).

Record type: Article

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

Text
ELECOM-S-09-01779-1.pdf - Other
Download (288kB)

More information

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
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693

Catalogue record

Date deposited: 21 May 2010 10:58
Last modified: 17 Dec 2019 02:01

Export record

Altmetrics

Contributors

Author: Philip A. Johns
Author: Matthew R. Roberts
Author: Yasuaki Wakizaka
Author: John R. Owen ORCID iD
Author: James H. Sanders

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×