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This content will become publicly available on April 26, 2019

Title: Superior Performance of a Lithium-Sulfur Battery Enabled by a Dimethyl Trisulfide Containing Electrolyte

The lithium-sulfur (Li-S) battery offers a high theoretical energy density of ≈2600 Wh/kg -1 and low cost, positioning it as a promising candidate for next-generation battery technology. However, problems including disastrous Li polysulfides dissolution and irreversible Li 2S deposition have severely retarded the development of Li-S batteries. To solve these issues, we recently reported a functional dimethyl disulfide (DMDS)-containing electrolyte that promoted an alternate electrochemical reaction pathway for sulfur cathodes by a formation of dimethyl polysulfides and Li organosulfides as intermediates and reduction products, leading to significantly boosted Li-S cell capacity with improved cycling reversibility and stability. Here in this work, dimethyl trisulfide (DMTS), a primary discharge-charge intermediate in the DMDS-containing electrolyte, which is also a commercially available reagent, was further investigated as a co-solvent in functional electrolytes for Li-S batteries. Due to the higher theoretical capacity of DMTS and its better reactivity with Li 2S than DMDS, a 25 vol% DMTS-containing electrolyte enables Li-S batteries with even higher cell capacity and improved cycling performance than using previous optimal 50 vol% DMDS-containing electrolyte.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering
Publication Date:
Report Number(s):
DOE-PENNSTATE-0007795
Journal ID: ISSN 2366-9608; PII:974
Grant/Contract Number:
EE0007795
Type:
Accepted Manuscript
Journal Name:
Small Methods
Additional Journal Information:
Journal Name: Small Methods; Journal ID: ISSN 2366-9608
Publisher:
Wiley
Research Org:
Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 42 ENGINEERING; lithium-sulfur battery; lithium organosulfides; dimethyl trisulfide; dimethyl disulfide; lithium-sulfur; batteries; electrolyte
OSTI Identifier:
1435969