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Journal article
Tuning functional two-dimensional MXene nanosheets to enable efficient sulfur utilization in lithium-sulfur batteries
Cell reports physical science, v 2(7), p100480
21 Jul 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Practicality of lithium-sulfur batteries is severely hindered by the notorious polysulfide-shuttle phenomenon, leading to rapid capacity fade. This issue is aggravated with increase in sulfur loading, causing low-coulombic efficiency and cycle life. Herein, we present a facile strategy to combine hydrophobic sulfur and hydrophilic, conductive Ti3C2Tz-MXene via one-step surface functionalization using di(hydrogenated tallow)benzylmethyl ammonium chloride (DHT). The latter renders the Ti3C2Tz surface hydrophobic, making it readily dispersible in sulfur dissolved in a carbon disulfide (CS2) solvent. By evaporating the solvent, we conformally coat the DHTTi3C2Tz (DMX) with sulfur. The developed composite, with higher available active area, enables effective trapping of lithium polysulfides (LiPs) on the electroactive sites within the cathode, leading to improvement in electrochemical performance at higher sulfur loadings. The DMX/S cathodes function with high sulfur loading of similar to 10.7 mg.cm(-2) and deliver a stable areal capacity of similar to 7 mAh.cm(-2) for 150 cycles. Moreover, a DMX/S cathode in a pouch-cell configuration retains similar to 770 mAh.g(-1) after similar to 200 cycles at 0.2C (85.5% retention). Ex situ studies elucidate the nature of the LiPs-MXene interaction and the effect of surface functionalization towards improved performance.
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Details
- Title
- Tuning functional two-dimensional MXene nanosheets to enable efficient sulfur utilization in lithium-sulfur batteries
- Creators
- Rahul Pai - Drexel UniversityVarun Natu - Drexel UniversityMaxim Sokol - Tel Aviv UniversityMichael Carey - Drexel UniversityMichel W. Barsoum - Drexel UniversityVibha Kalra - Drexel University
- Publication Details
- Cell reports physical science, v 2(7), p100480
- Publisher
- Elsevier
- Number of pages
- 20
- Grant note
- CMMI-1804374; 1919177; DMR-1740795 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Chemical and Biological Engineering
- Web of Science ID
- WOS:000677677000008
- Scopus ID
- 2-s2.0-85110601057
- Other Identifier
- 991019168027604721
UN Sustainable Development Goals (SDGs)
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Energy & Fuels
- Materials Science, Multidisciplinary
- Physics, Multidisciplinary