Journal
NANO LETTERS
Volume 21, Issue 13, Pages 5896-5904Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02142
Keywords
Thick electrodes; Lithium-ion batteries; Porous architectures; Ion transport kinetics; Alignment
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Funding
- Center for Mesoscale Transport Properties, an Energy Frontier Research Center -DOE-BES [DE-SC0012673]
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This study introduces a modified ice-templating method to fabricate low-tortuosity porous electrodes and systematically investigates the impact of structural parameters on thick electrode electrochemistry. It reveals that electrodes with thinner walls can maintain higher capacity under higher current densities.
Thick electrodes, although promising toward high-energy battery systems, suffer from restricted lithium-ion transport kinetics due to prolonged diffusion lengths and tortuous transport pathways. Despite the emerging low-tortuosity designs, capacity retention under higher current densities is still limited. Herein, we employ a modified ice-templating method to fabricate low-tortuosity porous electrodes with tunable wall thickness and channel width and systematically investigate the critical impacts of the fine structural parameters on the thick electrode electrochemistry. While the porous electrodes with thick walls show diminished capability under a C-rate larger than 1.5 C, those with thinner walls could maintain similar to 70% capacity under 2.5 C. The superior capacity retention is ascribed to the fast diffusion into the thin lamellar walls compared with their thicker counterparts. This study provides deeper insights into structure-affected electrochemistry and opens up new perspective of 3D porous architectural designs for high-energy and high-power electrodes.
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