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Title: Directly Formed Alucone on Lithium Metal for High-Performance Li Batteries and Li–S Batteries with High Sulfur Mass Loading

Journal Article · · ACS Applied Materials and Interfaces

Lithium metal is considered the "holy grail" of next-generation battery anodes. However, severe parasitic reactions at the lithium—electrolyte interface deplete the liquid electrolyte and the uncontrolled formation of high surface area and dendritic lithium during cycling causes rapid capacity fading and battery failure. Engineering a dendrite-free lithium metal anode is therefore critical for the development of longlife batteries using lithium anodes. In this study, we deposit a Lithium Metal Alucone-coated Uthnun conformal, organic/inorganic hybrid coating, for the first time, directly on lithium metal using molecular layer deposition (MLD) to alleviate these problems. This hybrid organic/inorganic film with high cross-linking structure can stabilize lithium against dendrite growth and minimize side reactions, as indicated by scanning electron microscopy. We discovered that the alucone coating yielded several times longer cycle life at high current rates compared to the uncoated lithium and achieved a steady Coulombic efficiency of 99.5%, demonstrating that the highly crosslinking structured material with great mechanical properties and good flexibility can effectively suppress dendrite formation. The protected Li was further evaluated in lithium—sulfur (Li—S) batteries with a high sulfur mass loading of —5 mg/cm2. After 140 cycles at a high current rate of —1 mA/cm2, alucone-coated Li—S batteries delivered a capacity of 657.7 mAh/g, 39.5% better than that of a bare lithium—sulfur battery. These findings suggest that flexible coating with high cross-linking structure by MLD is effective to enable lithium protection and offers a very promising avenue for improved performance in the real applications of Li—S batteries.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1473942
Report Number(s):
SAND-2018-9889J; 667715
Journal Information:
ACS Applied Materials and Interfaces, Vol. 10, Issue 8; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 55 works
Citation information provided by
Web of Science

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Cited By (6)

High Dielectric, Robust Composite Protective Layer for Dendrite‐Free and LiPF 6 Degradation‐Free Lithium Metal Anode journal September 2019
A Novel Organic “Polyurea” Thin Film for Ultralong-Life Lithium-Metal Anodes via Molecular-Layer Deposition journal December 2018
Recent developments and insights into the understanding of Na metal anodes for Na-metal batteries journal January 2018
Atomic and Molecular Layer Deposition for Superior Lithium-Sulfur Batteries: Strategies, Performance, and Mechanisms journal May 2018
Rational design of spontaneous reactions for protecting porous lithium electrodes in lithium–sulfur batteries journal July 2019
Atomic and Molecular Layer Deposition for Superior Lithium-Sulfur Batteries: Strategies, Performance, and Mechanisms journal June 2018

Figures / Tables (4)


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