A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries
Abstract
Abstract Li 2 S is a fully lithiated sulfur‐based cathode with a high theoretical capacity of 1166 mAh g −1 that can be coupled with lithium‐free anodes to develop high‐energy‐density lithium–sulfur batteries. Although various approaches have been pursued to obtain a high‐performance Li 2 S cathode, there are still formidable challenges with it (e.g., low conductivity, high overpotential, and irreversible polysulfide diffusion) and associated fabrication processes (e.g., insufficient Li 2 S, excess electrolyte, and low reversible capacity), which have prevented the realization of high electrochemical utilization and stability. Here, a new cathode design composed of a homogeneous Li 2 S‐TiS 2 ‐electrolyte composite that is prepared by a simple two‐step dry/wet‐mixing process is demonstrated, allowing the liquid electrolyte to wet the powder mixture consisting of insulating Li 2 S and conductive TiS 2 . The close‐contact, three‐phase boundary of this system improves the Li 2 S‐activation efficiency and provides fast redox‐reaction kinetics, enabling the Li 2 S‐TiS 2 ‐electrolyte cathode to attain stable cyclability at C/7 to C/3 rates, superior long‐term cyclability over 500 cycles, and promising high‐rate performance up to 1C rate. More importantly, this improved performance results from a cell design attaining a high Li 2 S loadingmore »
- Authors:
-
[1]
- Materials Science and Engineering Program &, Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1529640
- Grant/Contract Number:
- DE‐SC0005397
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Name: Advanced Energy Materials Journal Volume: 9 Journal Issue: 30; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Chung, Sheng‐Heng, and Manthiram, Arumugam. A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries. Germany: N. p., 2019.
Web. doi:10.1002/aenm.201901397.
Chung, Sheng‐Heng, & Manthiram, Arumugam. A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries. Germany. https://doi.org/10.1002/aenm.201901397
Chung, Sheng‐Heng, and Manthiram, Arumugam. Wed .
"A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries". Germany. https://doi.org/10.1002/aenm.201901397.
@article{osti_1529640,
title = {A Li 2 S‐TiS 2 ‐Electrolyte Composite for Stable Li 2 S‐Based Lithium–Sulfur Batteries},
author = {Chung, Sheng‐Heng and Manthiram, Arumugam},
abstractNote = {Abstract Li 2 S is a fully lithiated sulfur‐based cathode with a high theoretical capacity of 1166 mAh g −1 that can be coupled with lithium‐free anodes to develop high‐energy‐density lithium–sulfur batteries. Although various approaches have been pursued to obtain a high‐performance Li 2 S cathode, there are still formidable challenges with it (e.g., low conductivity, high overpotential, and irreversible polysulfide diffusion) and associated fabrication processes (e.g., insufficient Li 2 S, excess electrolyte, and low reversible capacity), which have prevented the realization of high electrochemical utilization and stability. Here, a new cathode design composed of a homogeneous Li 2 S‐TiS 2 ‐electrolyte composite that is prepared by a simple two‐step dry/wet‐mixing process is demonstrated, allowing the liquid electrolyte to wet the powder mixture consisting of insulating Li 2 S and conductive TiS 2 . The close‐contact, three‐phase boundary of this system improves the Li 2 S‐activation efficiency and provides fast redox‐reaction kinetics, enabling the Li 2 S‐TiS 2 ‐electrolyte cathode to attain stable cyclability at C/7 to C/3 rates, superior long‐term cyclability over 500 cycles, and promising high‐rate performance up to 1C rate. More importantly, this improved performance results from a cell design attaining a high Li 2 S loading of 6 mg cm −2 , a high Li 2 S content of 75 wt%, and a low electrolyte/Li 2 S ratio of 6.},
doi = {10.1002/aenm.201901397},
journal = {Advanced Energy Materials},
number = 30,
volume = 9,
place = {Germany},
year = {2019},
month = {6}
}
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