期刊
ACS NANO
卷 16, 期 6, 页码 9762-9771出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c03480
关键词
density-graded structures; three-dimensional current collectors; charge carrier transport; concentration polarization
类别
资金
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning (MSIP) [2017M3D1A1039558, 2020M3D1A1110522]
- Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning (MSIP) [2017M3A7B4049547]
- National Research Foundation of Korea [2020M3D1A1110522, 2017M3A7B4049547] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a density-graded composite electrode with tailored pore networks was demonstrated to effectively reduce energy loss at high charging rates, thus enhancing the rapid charging capability of lithium-ion batteries.
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.
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