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First-Principles Investigation of Lithium Polysulfide Structure and Behavior in Solution

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2]
  1. Texas A & M Univ., College Station, TX (United States). Department of Chemical Engineering; Texas A&M University
  2. Texas A & M Univ., College Station, TX (United States). Department of Chemical Engineering
We present the Lithium-Sulfur battery is a promising next generation energy storage technology that could meet the demands of modern society with a theoretical specific energy near 2500 W h kg-1. However, this battery chemistry faces unique problems such as the parasitic polysulfide shuttle reaction which hinders battery performance severely. This shuttle phenomenon is caused by solubilities of intermediate reaction products in the electrolyte during the reduction chemistry of the battery. With molecular simulation and computational chemistry tools, we studied the thermodynamics, solvation structure, and dynamics of the long-chain lithium polysulfide species Li2S6 and Li2S8 in dimethoxyethane and 1,3-dioxolane to gain a deeper fundamental understanding of this process. We determined the structure of the 1st solvation shell for Li+ as well as those of Li2S6, Li2S8 closed and Li2S8 linear in pure solvents and solvents with extra Li+ added. Finally, the lithium polysulfide species were found not to favor dissociation and would most likely exist as fully lithiated species in solution.
Research Organization:
Texas A&M Engineering Experiment Station, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
EE0006832
OSTI ID:
1430635
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 39 Vol. 121; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Computer Simulation of Cathode Materials for Lithium Ion and Lithium Batteries: A Review journal September 2018
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Revisiting the anchoring behavior in lithium-sulfur batteries: many-body effect on the suppression of shuttle effect journal January 2020
The role of polysulfide dianions and radical anions in the chemical, physical and biological sciences, including sulfur-based batteries journal January 2019
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