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

Journal Article · · Small Methods
ORCiD logo [1];  [2];  [2]; ORCiD logo [2]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering; Pennsylvania State University
  2. Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering

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 Li2S 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 Li2S 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.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
EE0007795
OSTI ID:
1435969
Report Number(s):
DOE-PENNSTATE--0007795; PII:974
Journal Information:
Small Methods, Journal Name: Small Methods Journal Issue: 6 Vol. 2; ISSN 2366-9608
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Conductive and Catalytic Triple-Phase Interfaces Enabling Uniform Nucleation in High-Rate Lithium-Sulfur Batteries journal October 2018