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Lookup NU author(s): Dr Chuan ChengORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Commercial Li-ion cell electrodes comprise a random mix of the constituent materials largely unchanged for more than three decades. During fast charge/discharge, electrode-scale Li-ion concentration gradients develop, along with a spatially heterogeneous distribution of overpotential, utilization and degradation of active material, which ultimately restricts the range of realizable energy-power combinations. We expand energy-power characteristics and reduce cell degradation rate using electrodes that are compositionally graded at the microscale to homogenize active material utilization. Trapezoidal-graded composition LiFePO4 cathodes, enabled by a layer-by-layer deposition technique, are compared with conventional electrodes: at an energy density of 500 Wh L−1 the best graded electrode design increased power density from approximately 100 W L−1 to 630 W L−1, while at a power density of 300 W L−1, the energy density increased from approximately 420 Wh L−1 to 600 Wh L−1. The results highlight the potential for new manufacturing approaches and electrode designs to provide performance enhancements for existing and future Li ion battery chemistries.
Author(s): Cheng C, Drummond R, Duncan SR, Grant PS
Publication type: Article
Publication status: Published
Journal: Journal of Power Sources
Year: 2022
Volume: 542
Print publication date: 15/09/2022
Online publication date: 23/06/2022
Acceptance date: 14/06/2022
Date deposited: 17/02/2023
ISSN (print): 0378-7753
ISSN (electronic): 1873-2755
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.jpowsour.2022.231758
DOI: 10.1016/j.jpowsour.2022.231758
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