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Modelling the impedance response of graded LiFePO4 cathodes for Li-ion batteries

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Drummond, Ross, Cheng, Chuan, Grant, Patrick and Duncan, Stephen (2022) Modelling the impedance response of graded LiFePO4 cathodes for Li-ion batteries. Journal of The Electrochemical Society, 169 (1). 010528. doi:10.1149/1945-7111/ac48c6

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WRAP-modelling-the-impedance-response-graded-LiFePO4-cathodes-Li-ion-batteries-Cheng-2022.pdf - Accepted Version
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Official URL: https://doi.org/10.1149/1945-7111/ac48c6

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Abstract

Graded electrodes for Li-ion batteries aim to exploit controlled variations in local electrode microstructure to improve overall battery performance, including reduced degradation rates and increased capacity at high discharge rates. However, the mechanisms by which grading might deliver performance benefit, and under what conditions, are not yet fully understood. A Li-ion battery electrochemical model (a modified Doyle-Fuller-Newman type model capable of generating impedance functions) is developed in which local microstructural changes are captured in order to understand why and when graded electrodes can offer performance benefits. Model predictions are evaluated against experimental electrochemical impedance data obtained from electrodes with micro-scale, controlled variations in microstructure. A region locally enriched with carbon at the electrode/current collector interface is shown to significantly reduce the overpotential distribution across the thickness of a LiFePO4-based Li-ion battery cathode, resulting in a lower charge transfer resistance and impedance. The insights gained from the LiFePO4-based electrodes are generalised to wider design principles for both uniform and graded Li-ion battery electrodes.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
T Technology > TS Manufactures
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries, Electric batteries -- Electrodes , Cathodes , Electrochemistry , Electrodes -- Materials
Journal or Publication Title: Journal of The Electrochemical Society
Publisher: Electrochemical Society, Inc.
ISSN: 0013-4651
Official Date: 21 January 2022
Dates:
DateEvent
21 January 2022Published
6 January 2022Available
6 January 2022Accepted
Volume: 169
Number: 1
Article Number: 010528
DOI: 10.1149/1945-7111/ac48c6
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2022 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
FIRG015Faraday Technologyhttp://dx.doi.org/10.13039/100006587

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