Superior Performance of a Lithium-Sulfur Battery Enabled by a Dimethyl Trisulfide Containing Electrolyte
- Pennsylvania State Univ., University Park, PA (United States). Dept of Mechanical and Nuclear Engineering; Pennsylvania State University
- 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
Conductive and Catalytic Triple-Phase Interfaces Enabling Uniform Nucleation in High-Rate Lithium-Sulfur Batteries
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journal | October 2018 |
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