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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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WRAP-micro-scale-graded-electrodes-dynamic-cycling-batteries-Cheng-2019.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3771Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.jpowsour.2018.12.021
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 | ||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| 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 | ||||||||
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| 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: |
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