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Title: Dual Lithiophilic Structure for Uniform Li Deposition

Journal Article · · ACS Applied Materials and Interfaces

The development of Li metal anode 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 due to convection in the electrolyte. Here, we employ a dual lithiophilic structure composed of polar metal organic framework (MOF) and highly conductive Ag nanoparticles, and we show that it brings about uniform lithium deposition. Here, 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 exhibits a Coulombic efficiency (CE) of 97% over 300 cycles and a high areal capacity of 5 mAh cm-2 without dendrite formation.

Research Organization:
University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008688
OSTI ID:
2311177
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 11 Vol. 11; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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