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Micro-scale graded electrodes for improved dynamic and cycling performance of Li-ion batteries

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Cheng, Chuan, Drummond, Ross, Duncan, Stephen R. and Grant, Patrick S. (2019) Micro-scale graded electrodes for improved dynamic and cycling performance of Li-ion batteries. Journal of Power Sources, 413 . pp. 59-67. doi:10.1016/j.jpowsour.2018.12.021

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2018.12.021

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Abstract

Li-ion battery cathodes based on LiFePO4 are fabricated by a layer-by-layer spray printing method with a continuous through thickness gradient of active material, conductive carbon, and binder. Compared with cathodes with the more usual homogeneous distribution, but with the same average composition, both C-rate and capacity degradation performance of the graded electrodes are significantly improved. For example at 2C, graded cathodes with an optimized material distribution have 15% and 31% higher discharge capacities than sprayed uniform or conventional slurry cast uniform cathodes, and capacity degradation rates are 40–50% slower than uniform cathodes at 2C. The improved performance of graded electrodes is shown to derive from a lower charge transfer resistance and reduced polarization at high C-rates, which suggests a more spatially homogeneous distribution of over-potential that leads to a thinner solid electrolyte interphase formation during cycling and sustains improved C-rate and long-term cycling performance.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Electrodes, Lithium ion batteries -- Testing, Impedance spectroscopy
Journal or Publication Title: Journal of Power Sources
Publisher: Elsevier S.A.
ISSN: 0378-7753
Official Date: 15 February 2019
Dates:
DateEvent
15 February 2019Published
15 December 2018Available
9 December 2018Accepted
Volume: 413
Page Range: pp. 59-67
DOI: 10.1016/j.jpowsour.2018.12.021
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/P005411/1 ; Structured electrodes for improved energy storage.[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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