DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Liquid Sulfur Impregnation of Microporous Carbon Accelerated by Nanoscale Interfacial Effects

Journal Article · · Nano Letters
ORCiD logo [1]; ORCiD logo [2];  [2];  [2];  [1];  [3]; ORCiD logo [2];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Impregnation of porous carbon matrices with liquid sulfur has been exploited to fabricate composite cathodes for lithium-sulfur batteries, aimed at confining soluble sulfur species near conducting carbon to prevent both loss of active material into the electrolyte and parasitic reactions at the lithium metal anode. Here, through extensive computer simulations, we uncover the strongly favorable interfacial free energy between liquid sulfur and graphitic surfaces that underlies this phenomenon. Previously unexplored curvature-dependent enhancements are shown to favor the filling of smaller pores first and effect a quasi-liquid sulfur phase in microporous domains (diameters <2 nm) that persists ~30° below the expected freezing point. Evidence of interfacial sulfur on carbon is shown to be a 0.3 eV red shift in the simulated and measured interfacial X-ray absorption spectra. Our results elucidate the critical morphology and thermodynamic properties necessary for future cathode design and highlight the importance of molecular-scale details in defining emergent properties of functional nanoscale interfaces.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1379807
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 4 Vol. 17; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (34)

Characterization of Polysulfide Radicals Present in an Ether-Based Electrolyte of a Lithium-Sulfur Battery During Initial Discharge Using In Situ X-Ray Absorption Spectroscopy Experiments and First-Principles Calculations journal June 2015
Li-S Battery Analyzed by UV/Vis in Operando Mode journal June 2013
Wettability and work of adhesion of liquid sulfur on carbon materials for electrical energy storage applications journal March 2016
Li/S fundamental chemistry and application to high-performance rechargeable batteries journal November 2004
Lithium/Sulfur Cell Discharge Mechanism: An Original Approach for Intermediate Species Identification journal April 2012
Distribution of Sulfur in Carbon/Sulfur Nanocomposites Analyzed by Small-Angle X-ray Scattering journal March 2016
Polysulfide-Blocking Microporous Polymer Membrane Tailored for Hybrid Li-Sulfur Flow Batteries journal August 2015
Hierarchically Structured Sulfur/Carbon Nanocomposite Material for High-Energy Lithium Battery journal October 2009
Elemental sulfur journal June 1976
The Surface Tension of Sulfur journal September 1950
Graphene Oxide as a Sulfur Immobilizer in High Performance Lithium/Sulfur Cells journal November 2011
Sulfur Speciation in Li–S Batteries Determined by Operando X-ray Absorption Spectroscopy journal September 2013
X-ray Absorption Spectra of Dissolved Polysulfides in Lithium–Sulfur Batteries from First-Principles journal April 2014
Phase Transitions in Pores:  Experimental and Simulation Studies of Melting and Freezing journal August 1999
Graphene-Wrapped Sulfur Particles as a Rechargeable Lithium–Sulfur Battery Cathode Material with High Capacity and Cycling Stability journal July 2011
Sulphur–TiO2 yolk–shell nanoarchitecture with internal void space for long-cycle lithium–sulphur batteries journal January 2013
A highly ordered nanostructured carbon–sulphur cathode for lithium–sulphur batteries journal May 2009
Observation of extreme phase transition temperatures of water confined inside isolated carbon nanotubes journal November 2016
X-ray spectroscopy as a probe for lithium polysulfide radicals journal January 2015
Unique behaviour of nonsolvents for polysulphides in lithium–sulphur batteries journal January 2014
Carbon–sulfur composites for Li–S batteries: status and prospects journal January 2013
Density functional and Monte Carlo studies of sulfur. II. Equilibrium polymerization of the liquid phase journal October 2003
Quantum mechanics based force field for carbon (QMFF-Cx) validated to reproduce the mechanical and thermodynamics properties of graphite journal October 2010
Phase equilibria and solvation forces for fluids confined between parallel walls journal June 1987
High-performance hollow sulfur nanostructured battery cathode through a scalable, room temperature, one-step, bottom-up approach journal April 2013
Compliant glass–polymer hybrid single ion-conducting electrolytes for lithium batteries journal December 2015
III. An essay on the cohesion of fluids journal January 1805
Higher-accuracy van der Waals density functional journal August 2010
The structure of interfacial water on gold electrodes studied by x-ray absorption spectroscopy journal October 2014
A Solid Sulfur Cathode for Aqueous Batteries journal August 1993
Capillarity and Wetting of Carbon Nanotubes journal September 1994
Polysulfide Shuttle Study in the Li/S Battery System journal January 2004
Lithium Sulfur Battery: Oxidation/Reduction Mechanisms of Polysulfides in THF Solutions journal January 1988
A Mathematical Model for a Lithium–Sulfur Cell journal January 2008

Cited By (4)