Cited 0 time in webofscience Cited 1 time in scopus

Confined Li metal storage in porous carbon frameworks promoted by strong Li–substrate interaction

Title
Confined Li metal storage in porous carbon frameworks promoted by strong Li–substrate interaction
Authors
Yun, JonghyeokShin, Hong RimWon, Eun-SeoKang, Hyon CholLee, Jong-Won
DGIST Authors
Yun, Jonghyeok; Shin, Hong Rim; Won, Eun-Seo; Kang, Hyon Chol; Lee, Jong-Won
Issue Date
2022-02
Citation
Chemical Engineering Journal, 430
Type
Article
Author Keywords
Current collectorLithiophilic layerLithium batteryLithium metalMetal–organic framework
Keywords
LITHIUM DEPOSITIONANODEGROWTHELECTROLYTEBATTERIESSKELETONFOAM
ISSN
1385-8947
Abstract
Li metal suffers from uncontrollable dendrite formation and huge volume changes during cycling, resulting in shortened cycle lifetimes. Porous carbon frameworks have been explored as host materials to store Li metal; however, the low pore utilization and uneven Li plating remain crucial issues. Herein, we demonstrate that a strong interaction between Li and substrate plays a critical role in enhancing pore utilization in the carbon framework electrodes, thus improving their cycle lifetimes. As a model architecture, we examine a Li storage process in a framework electrode consisting of porous carbon derived from metal–organic frameworks (MOFs) and a galvanically displaced Ag layer on a Cu substrate. The MOF-derived carbon framework electrode on the Ag-deposited Cu substrate exhibits significantly better cycling stability (>250 cycles) than the electrode on bare Cu (140 cycles). In-operando synchrotron X-ray diffraction studies combined with microstructural characterizations reveal that the lithiophilic Ag on the substrate preferentially reacts with Li+ to form LixAg during the initial stage of Li plating and promotes confined Li storage in the carbon framework electrode while suppressing top plating. However, the Ag layer is found to lose its effectiveness when the thickness of the electrode exceeds a critical value. Based on simulation studies, the efficacy of lithiophilic layers toward improving pore utilization is discussed in terms of the kinetic competition between Li+ transport through porous channels and the interfacial reaction of Li+ with the substrate, which can provide a guideline for designing porous carbon frameworks with high capacity and long cycle lifetimes. © 2021 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/15755
DOI
10.1016/j.cej.2021.132897
Publisher
Elsevier B.V.
Related Researcher
  • Author Lee, Jong-Won Laboratory for Electrochemical Energy Materials and Interfaces
  • Research Interests 이차전지, 연료전지, 재료전기화학, 나노에너지소재
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringLaboratory for Electrochemical Energy Materials and Interfaces1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE