Three-Dimensional, Submicron Porous Electrode with a Density Gradient to Enhance Charge Carrier Transport

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Rapid charging capability is a requisite feature of lithium-ion batteries (LIBs). To overcome the capacity degradation from a steep Li-ion concentration gradient during the fast reaction, electrodes with tailored transport kinetics have been explored by managing the geometries. However, the traditional electrode fabrication process has great challenges in precisely controlling and implementing the desired pore networks and configuration of electrode materials. Herein, we demonstrate a density-graded composite electrode that arises from a three-dimensional current collector in which the porosity gradually decreases to 53.8% along the depth direction. The density-graded electrode effectively reduces energy loss at high charging rates by mitigating polarization. This electrode shows an outstanding capacity of 94.2 mAh g(-1) at a fast current density of 59.7 C (20 A g(-1)), which is much higher than that of an electrode with a nearly constant density gradient (38.0 mAh g(-1)). Through these in-depth studies on the pore networks and their transport kinetics, we describe the design principle of rational electrode geometries for ultrafast charging LIBs.
Publisher
AMER CHEMICAL SOC
Issue Date
2022-06
Language
English
Article Type
Article
Citation

ACS NANO, v.16, no.6, pp.9762 - 9771

ISSN
1936-0851
DOI
10.1021/acsnano.2c03480
URI
http://hdl.handle.net/10203/297322
Appears in Collection
MS-Journal Papers(저널논문)
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