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High Sulfur Content Material with Stable Cycling in Lithium‐Sulfur Batteries

We demonstrate a novel crosslinked disulfide system as a cathode material for Li‐S cells that is designed with the two criteria of having only a single point of S−S scission and maximizing the ratio of S−S to the electrochemically inactive framework. The material therefore maximizes theoretical capa... Full description

Journal Title: Angewandte Chemie International Edition 20 November 2017, Vol.56(47), pp.15118-15122
Main Author: Preefer, Molleigh B.
Other Authors: Oschmann, Bernd , Hawker, Craig J. , Seshadri, Ram , Wudl, Fred
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1433-7851 ; E-ISSN: 1521-3773 ; DOI: 10.1002/anie.201708746
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recordid: wj10.1002/anie.201708746
title: High Sulfur Content Material with Stable Cycling in Lithium‐Sulfur Batteries
format: Article
creator:
  • Preefer, Molleigh B.
  • Oschmann, Bernd
  • Hawker, Craig J.
  • Seshadri, Ram
  • Wudl, Fred
subjects:
  • Battery
  • Cathode
  • Disulfide
  • Lithium-Sulfur Battery
ispartof: Angewandte Chemie International Edition, 20 November 2017, Vol.56(47), pp.15118-15122
description: We demonstrate a novel crosslinked disulfide system as a cathode material for Li‐S cells that is designed with the two criteria of having only a single point of S−S scission and maximizing the ratio of S−S to the electrochemically inactive framework. The material therefore maximizes theoretical capacity while inhibiting the formation of polysulfide intermediates that lead to parasitic shuttle. The material we report contains a 1:1 ratio of S:C with a theoretical capacity of 609 mAh g. The cell gains capacity through 100 cycles and has 98 % capacity retention thereafter through 200 cycles, demonstrating stable, long‐term cycling. Raman spectroscopy confirms the proposed mechanism of disulfide bonds breaking to form a S−Li thiolate species upon discharge and reforming upon charge. Coulombic efficiencies near 100 % for every cycle, suggesting the suppression of polysulfide shuttle through the molecular design. : A crosslinked disulfide material with high sulfur content displays stable cycling in a lithium‐sulfur battery with no evidence of the detrimental polysulfide shuttle.
language: eng
source:
identifier: ISSN: 1433-7851 ; E-ISSN: 1521-3773 ; DOI: 10.1002/anie.201708746
fulltext: fulltext
issn:
  • 1433-7851
  • 14337851
  • 1521-3773
  • 15213773
url: Link


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titleHigh Sulfur Content Material with Stable Cycling in Lithium‐Sulfur Batteries
creatorPreefer, Molleigh B. ; Oschmann, Bernd ; Hawker, Craig J. ; Seshadri, Ram ; Wudl, Fred
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subjectBattery ; Cathode ; Disulfide ; Lithium-Sulfur Battery
descriptionWe demonstrate a novel crosslinked disulfide system as a cathode material for Li‐S cells that is designed with the two criteria of having only a single point of S−S scission and maximizing the ratio of S−S to the electrochemically inactive framework. The material therefore maximizes theoretical capacity while inhibiting the formation of polysulfide intermediates that lead to parasitic shuttle. The material we report contains a 1:1 ratio of S:C with a theoretical capacity of 609 mAh g. The cell gains capacity through 100 cycles and has 98 % capacity retention thereafter through 200 cycles, demonstrating stable, long‐term cycling. Raman spectroscopy confirms the proposed mechanism of disulfide bonds breaking to form a S−Li thiolate species upon discharge and reforming upon charge. Coulombic efficiencies near 100 % for every cycle, suggesting the suppression of polysulfide shuttle through the molecular design. : A crosslinked disulfide material with high sulfur content displays stable cycling in a lithium‐sulfur battery with no evidence of the detrimental polysulfide shuttle.
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titleHigh Sulfur Content Material with Stable Cycling in Lithium‐Sulfur Batteries
descriptionWe demonstrate a novel crosslinked disulfide system as a cathode material for Li‐S cells that is designed with the two criteria of having only a single point of S−S scission and maximizing the ratio of S−S to the electrochemically inactive framework. The material therefore maximizes theoretical capacity while inhibiting the formation of polysulfide intermediates that lead to parasitic shuttle. The material we report contains a 1:1 ratio of S:C with a theoretical capacity of 609 mAh g. The cell gains capacity through 100 cycles and has 98 % capacity retention thereafter through 200 cycles, demonstrating stable, long‐term cycling. Raman spectroscopy confirms the proposed mechanism of disulfide bonds breaking to form a S−Li thiolate species upon discharge and reforming upon charge. Coulombic efficiencies near 100 % for every cycle, suggesting the suppression of polysulfide shuttle through the molecular design. : A crosslinked disulfide material with high sulfur content displays stable cycling in a lithium‐sulfur battery with no evidence of the detrimental polysulfide shuttle.
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abstractWe demonstrate a novel crosslinked disulfide system as a cathode material for Li‐S cells that is designed with the two criteria of having only a single point of S−S scission and maximizing the ratio of S−S to the electrochemically inactive framework. The material therefore maximizes theoretical capacity while inhibiting the formation of polysulfide intermediates that lead to parasitic shuttle. The material we report contains a 1:1 ratio of S:C with a theoretical capacity of 609 mAh g. The cell gains capacity through 100 cycles and has 98 % capacity retention thereafter through 200 cycles, demonstrating stable, long‐term cycling. Raman spectroscopy confirms the proposed mechanism of disulfide bonds breaking to form a S−Li thiolate species upon discharge and reforming upon charge. Coulombic efficiencies near 100 % for every cycle, suggesting the suppression of polysulfide shuttle through the molecular design. : A crosslinked disulfide material with high sulfur content displays stable cycling in a lithium‐sulfur battery with no evidence of the detrimental polysulfide shuttle.
doi10.1002/anie.201708746
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pages15118-15122
date2017-11-20