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

Lookup NU author(s): Dr Chuan ChengORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

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.

Publication metadata

Author(s): Cheng C, Drummond R, Duncan SR, Grant PS

Publication type: Article

Publication status: Published

Journal: Journal of Power Sources

Year: 2019

Volume: 413

Pages: 59-67

Print publication date: 15/02/2019

Online publication date: 15/12/2018

Acceptance date: 09/12/2018

Date deposited: 02/02/2023

ISSN (print): 0378-7753

ISSN (electronic): 1873-2755

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.jpowsour.2018.12.021

DOI: 10.1016/j.jpowsour.2018.12.021

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