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Title: TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries

Abstract

Sulfur cathodes have a high theoretical capacity of 1675 mAh g–1, making the lithium–sulfur batteries a promising technology for future energy-storage devices. However, their commercial viability is faced with challenges arising from intrinsic electrochemical instabilities and inappropriate cell fabrication parameters. We report here the feasibility of employing TiS2 as a conductive polysulfide adsorbent, which allows the use of a high amount of electrochemically active polysulfides in building a TiS2–polysulfide hybrid cathode. The hybrid cathode exhibits long cycle stability at a C/5 rate over 200 cycles with a high areal capacity and energy density of, respectively, 10 mAh cm–2 and 20 mWh cm–2, exceeding those of commercial LiCoO2. Furthermore, such an enhanced electrochemical performance is obtained in cells with a high sulfur content (65 wt %), high sulfur loading (12 mg cm–2), high sulfur mass (12 mg/cathode), and a low electrolyte/sulfur ratio of just 5 μL mg–1.

Authors:
 [1];  [1]; ORCiD logo [1]
  1. Univ. of Texas at Austin, Austin, TX (United States)
Publication Date:
Research Org.:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1488315
Grant/Contract Number:  
EE0007218
Resource Type:
Accepted Manuscript
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE

Citation Formats

Chung, Sheng -Heng, Luo, Liu, and Manthiram, Arumugam. TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries. United States: N. p., 2018. Web. doi:10.1021/acsenergylett.7b01321.
Chung, Sheng -Heng, Luo, Liu, & Manthiram, Arumugam. TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries. United States. https://doi.org/10.1021/acsenergylett.7b01321
Chung, Sheng -Heng, Luo, Liu, and Manthiram, Arumugam. Wed . "TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries". United States. https://doi.org/10.1021/acsenergylett.7b01321. https://www.osti.gov/servlets/purl/1488315.
@article{osti_1488315,
title = {TiS2–Polysulfide Hybrid Cathode with High Sulfur Loading and Low Electrolyte Consumption for Lithium–Sulfur Batteries},
author = {Chung, Sheng -Heng and Luo, Liu and Manthiram, Arumugam},
abstractNote = {Sulfur cathodes have a high theoretical capacity of 1675 mAh g–1, making the lithium–sulfur batteries a promising technology for future energy-storage devices. However, their commercial viability is faced with challenges arising from intrinsic electrochemical instabilities and inappropriate cell fabrication parameters. We report here the feasibility of employing TiS2 as a conductive polysulfide adsorbent, which allows the use of a high amount of electrochemically active polysulfides in building a TiS2–polysulfide hybrid cathode. The hybrid cathode exhibits long cycle stability at a C/5 rate over 200 cycles with a high areal capacity and energy density of, respectively, 10 mAh cm–2 and 20 mWh cm–2, exceeding those of commercial LiCoO2. Furthermore, such an enhanced electrochemical performance is obtained in cells with a high sulfur content (65 wt %), high sulfur loading (12 mg cm–2), high sulfur mass (12 mg/cathode), and a low electrolyte/sulfur ratio of just 5 μL mg–1.},
doi = {10.1021/acsenergylett.7b01321},
journal = {ACS Energy Letters},
number = 3,
volume = 3,
place = {United States},
year = {2018},
month = {2}
}

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Cited by: 37 works
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Figures / Tables:

Figure 1 Figure 1: (a) Schematic fabrication process of the hybrid TiS2-polysulfide cathode. Microstructural analysis with SEM and EDX of the (b) freshly-made cathode and (c) cycled cathode after 200 cycles.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.