The University of Southampton
University of Southampton Institutional Repository

Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery

Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery
Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery
The factors effecting discharge rate limitation within LiFePO4 composite electrode structures have been investigated. It was found that for composite electrodes containing ‘small particles’ of active material solid state processes are not necessarily rate limiting. A simple model has been developed to describe the rate limitation that occurs in the composite electrode structure due to electrolyte concentration, electrode thickness and lithium ion transference number. The conformal electrodeposition of cathode materials onto 3D current collectors has been achieved with good control of film thickness. The advantage of the 3D current collector configuration over a conventional thin film arrangement has been realised by a 250 times capacity increase for a given footprint area. It was suggested the observed rate performance of half-cell 3D microbatteries, based on a manganese dioxide cathode and a lithium foil anode, was limited by the lithium ion transport distance through the porous 3D structure. The electrodeposition of conformal polymers layers onto 3D substrates was investigated. The use of electrodeposited, electrolyte swollen, poly(acrylonitrile) and poly(aniline) films as polymer electrolytes was demonstrated. A novel method for the determination and differentiation of electronic and ionic resistance in electrodeposited polymer layers has been developed. A ‘working’ cell based on consecutively electrodeposited cathode and polymer electrolyte layers and a ‘soft contact’ liquid anode was presented
Johns, Phillip A.
c6f31639-bde2-4d28-ac3e-07d36041f4c0
Johns, Phillip A.
c6f31639-bde2-4d28-ac3e-07d36041f4c0
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d

Johns, Phillip A. (2011) Investigations of rate limitation in nanostructured composite electrodes and experiments towards a 3D Li-ion microbattery. University of Southampton, Chemistry, Doctoral Thesis, 219pp.

Record type: Thesis (Doctoral)

Abstract

The factors effecting discharge rate limitation within LiFePO4 composite electrode structures have been investigated. It was found that for composite electrodes containing ‘small particles’ of active material solid state processes are not necessarily rate limiting. A simple model has been developed to describe the rate limitation that occurs in the composite electrode structure due to electrolyte concentration, electrode thickness and lithium ion transference number. The conformal electrodeposition of cathode materials onto 3D current collectors has been achieved with good control of film thickness. The advantage of the 3D current collector configuration over a conventional thin film arrangement has been realised by a 250 times capacity increase for a given footprint area. It was suggested the observed rate performance of half-cell 3D microbatteries, based on a manganese dioxide cathode and a lithium foil anode, was limited by the lithium ion transport distance through the porous 3D structure. The electrodeposition of conformal polymers layers onto 3D substrates was investigated. The use of electrodeposited, electrolyte swollen, poly(acrylonitrile) and poly(aniline) films as polymer electrolytes was demonstrated. A novel method for the determination and differentiation of electronic and ionic resistance in electrodeposited polymer layers has been developed. A ‘working’ cell based on consecutively electrodeposited cathode and polymer electrolyte layers and a ‘soft contact’ liquid anode was presented

Text
PhD_Thesis_Phillip_Johns.pdf - Other
Download (13MB)

More information

Published date: 30 June 2011
Organisations: University of Southampton, Chemistry

Identifiers

Local EPrints ID: 206161
URI: http://eprints.soton.ac.uk/id/eprint/206161
PURE UUID: 7d4ab444-948f-4f20-b6e7-b0e3fd424e55
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693

Catalogue record

Date deposited: 15 Dec 2011 13:57
Last modified: 30 Jan 2020 01:26

Export record

Contributors

Author: Phillip A. Johns
Thesis advisor: John R. Owen ORCID iD

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.

×