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Title: Formation of Multilayer Graphene Domains with Strong Sulfur-Carbon Interaction and Enhanced Sulfur Reduction Zones for Lithium-Sulfur Battery Cathodes

Journal Article · · ChemSusChem

Abstract A newly designed sulfur/graphene computational model emulates the electrochemical behavior of a Li–S battery cathode, promoting the S–C interaction through the edges of graphene sheets. A random mixture of eight‐membered sulfur rings mixed with small graphene sheets is simulated at 64 wt %sulfur loading. Structural stabilization and sulfur reduction calculations are performed with classical reactive molecular dynamics. This methodology allowed the collective behavior of the sulfur and graphene structures to be accounted for. The sulfur encapsulation induces ring opening and the sulfur phase evolves into a distribution of small chain‐like structures interacting with C through the graphene edges. This new arrangement of the sulfur phase not only leads to a less pronounced volume expansion during sulfur reduction but also to a different discharge voltage profile, in qualitative agreement with earlier reports on sulfur encapsulation in microporous carbon structures. The Li 2 S phase grows around ensembles of parallel graphene nanosheets during sulfur reduction. No diffusion of sulfur or lithium between graphene nanosheets is observed, and extended Li 2 S domains bridging the space between carbon ensembles are suppressed. The results emphasize the importance of morphology on the electrochemical performance of the composite material. The sulfur/graphene model outlined here provides new understanding of the graphene effects on the sulfur reduction behavior and the role that van der Waals interactions may play in promoting formation of multilayer graphene ensembles and small Li 2 S domains during sulfur reduction.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE
Contributing Organization:
Texas A&M High Performance Computing Center; Texas Advanced Computing Center
Grant/Contract Number:
EE0008210; EE0006832
OSTI ID:
1460744
Alternate ID(s):
OSTI ID: 1426313
Journal Information:
ChemSusChem, Vol. 11, Issue 12; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Sulfur Spillover on Carbon Materials and Possible Impacts on Metal-Sulfur Batteries journal September 2018
Intertwined Nitrogen‐Doped Carbon Nanotube Microsphere as Polysulfide Grappler for High‐Performance Lithium‐Sulfur Batteries journal January 2019
The Crystallinity of Metal Oxide in Carbonized Metal Organic Frameworks and the Effect on Restricting Polysulfides journal December 2019
Rational Fabrication of Nitrogen and Sulfur Codoped Carbon Nanotubes/MoS 2 for High‐Performance Lithium–Sulfur Batteries journal June 2019
Computer Simulation of Cathode Materials for Lithium Ion and Lithium Batteries: A Review journal September 2018
β‐molybdenum carbide/carbon nanofibers as a shuttle inhibitor for lithium‐sulfur battery with high sulfur loading journal August 2019
First-principles explorations of the electrochemical lithiation dynamics of a multilayer graphene nanosheet-based sulfur–carbon composite journal January 2018
Tailoring the Grain Size of Bi-Layer Graphene by Pulsed Laser Deposition journal November 2018

Figures / Tables (12)