AI Article Synopsis
- Thick electrodes can enhance battery energy but struggle with lithium-ion transport due to long diffusion paths.
- Researchers used a modified ice-templating method to create porous electrodes with adjustable wall thickness and channel width, focusing on how these structural features affect battery performance.
- Thinner-walled electrodes retained about 70% capacity at higher current densities due to better diffusion, suggesting that optimizing electrode design can improve both energy and power in batteries.
Article Abstract
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 ∼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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| http://dx.doi.org/10.1021/acs.nanolett.1c02142 | DOI Listing |
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