Dual Lithiophilic Structure for Uniform Li Deposition

Shouyi Yuan, Junwei Lucas Bao, Chao Li, Yongyao Xia, Donald G. Truhlar, Yonggang Wang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

The development of Li metal anodes is hindered by the Li dendrites arising from the random deposition of Li metal during cycles. Hence, uniform deposition of Li during repeated cycles is crucial for the development of Li metal batteries. However, it is difficult to regulate Li deposition because of convection in the electrolyte. Here, we employ a dual lithiophilic structure composed of a polar metal-organic framework (MOF) and highly conductive Ag nanoparticles, and we show that it brings about uniform lithium deposition. The binding energy for Li is increased by the abundant oxygen sites and large surface area of the MOF, and concomitantly, the uniform distribution of Li nuclei can be achieved with a low nucleation overpotential. When highly conductive lithiophilic Ag is incorporated into the MOF, the binding energy for Li is further increased and the nucleation overpotential is decreased to nearly zero. As a result, Li platting and stripping on the Ag@MOF (i.e., Ag@HKUST-1) substrate exhibit a Coulombic efficiency of 97% over 300 cycles and a high areal capacity of 5 mA h cm-2 without dendrite formation.

Original languageEnglish (US)
Pages (from-to)10616-10623
Number of pages8
JournalACS Applied Materials and Interfaces
Volume11
Issue number11
DOIs
StatePublished - Mar 20 2019

Bibliographical note

Funding Information:
We acknowledge funding from the National Natural Science Foundation of China (21622303), the State Key Basic Research Program of China (2016YFA0203302), and the U.S. Department of Energy, Office of Basic Energy Sciences (DE-FG02-17ER16362).

Publisher Copyright:
Copyright © 2019 American Chemical Society.

Keywords

  • Ag nanoparticles
  • Li deposition
  • dual lithiophilic structure
  • metal-organic framework
  • nucleation overpotential

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