ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries
Abstract
Tremendous effort has been devoted to lithium-sulfur batteries, where flooded electrolytes have been employed ubiquitously. The use of lean electrolytes albeit indispensable for practical applications often causes low capacity and fast capacity fading of the sulfur cathode; thus, the electrolyte/sulfur active mass ratios below 5 µL/mg have been rarely reported. Herein, we demonstrate that ZnS coating transforms sulfur cathode materials electrolyte-philic, which tremendously promotes the performance in lean electrolytes. The ZnS-coated Li2S@graphene cathode delivers an initial discharge capacity of 944 mAh/g at an E/S ratio of 2 µL/mg at the active mass loading of 5.0 mg Li2S/cm2, corresponding to an impressive specific energy of 500 Wh/kg based on the mass of cathode, electrolyte, and the assumed minimal mass of lithium metal anode. Density functional theory calculations reveal strong binding between ZnS crystals and electrolyte solvent molecules, explaining the better wetting properties. We also demonstrate the reversible cycling of a hybrid cathode of ZnS-coated Li2S@graphene mixed with VS2 as an additive at an E/AM (active mass) ratio of 1.1 µL/mg, equivalent to the specific energy of 432 Wh/kg on the basis of the mass of electrodes and electrolyte.
- Authors:
-
[1]
- Department of ChemistryOregon State University Corvallis Oregon
- Chemical Sciences and Engineering DivisionArgonne National Laboratory Lemont Illinois
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1570774
- Alternate Identifier(s):
- OSTI ID: 1570775; OSTI ID: 1761070
- Grant/Contract Number:
- DE‐FOA‐0001629; DE‐AC02‐06CH11357; AC02-06CH11357; FOA‐000162
- Resource Type:
- Published Article
- Journal Name:
- Carbon Energy
- Additional Journal Information:
- Journal Name: Carbon Energy Journal Volume: 1 Journal Issue: 2; Journal ID: ISSN 2637-9368
- Publisher:
- Wiley
- Country of Publication:
- China
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; electrolyte-philic; lean electrolyte; Li2S cathode; lithium-sulfur battery; ZnS coating
Citation Formats
Shin, Woochul, Lu, Jun, and Ji, Xiulei. ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries. China: N. p., 2019.
Web. doi:10.1002/cey2.10.
Shin, Woochul, Lu, Jun, & Ji, Xiulei. ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries. China. https://doi.org/10.1002/cey2.10
Shin, Woochul, Lu, Jun, and Ji, Xiulei. Wed .
"ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries". China. https://doi.org/10.1002/cey2.10.
@article{osti_1570774,
title = {ZnS coating of cathode facilitates lean‐electrolyte Li‐S batteries},
author = {Shin, Woochul and Lu, Jun and Ji, Xiulei},
abstractNote = {Tremendous effort has been devoted to lithium-sulfur batteries, where flooded electrolytes have been employed ubiquitously. The use of lean electrolytes albeit indispensable for practical applications often causes low capacity and fast capacity fading of the sulfur cathode; thus, the electrolyte/sulfur active mass ratios below 5 µL/mg have been rarely reported. Herein, we demonstrate that ZnS coating transforms sulfur cathode materials electrolyte-philic, which tremendously promotes the performance in lean electrolytes. The ZnS-coated Li2S@graphene cathode delivers an initial discharge capacity of 944 mAh/g at an E/S ratio of 2 µL/mg at the active mass loading of 5.0 mg Li2S/cm2, corresponding to an impressive specific energy of 500 Wh/kg based on the mass of cathode, electrolyte, and the assumed minimal mass of lithium metal anode. Density functional theory calculations reveal strong binding between ZnS crystals and electrolyte solvent molecules, explaining the better wetting properties. We also demonstrate the reversible cycling of a hybrid cathode of ZnS-coated Li2S@graphene mixed with VS2 as an additive at an E/AM (active mass) ratio of 1.1 µL/mg, equivalent to the specific energy of 432 Wh/kg on the basis of the mass of electrodes and electrolyte.},
doi = {10.1002/cey2.10},
journal = {Carbon Energy},
number = 2,
volume = 1,
place = {China},
year = {Wed Oct 16 00:00:00 EDT 2019},
month = {Wed Oct 16 00:00:00 EDT 2019}
}
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