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Robust, Ultra‐Tough Flexible Cathodes for High‐Energy Li–S Batteries

Sulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The... Full description

Journal Title: Small February 2016, Vol.12(7), pp.939-950
Main Author: Chung, Sheng‐Heng
Other Authors: Chang, Chi‐Hao , Manthiram, Arumugam
Format: Electronic Article Electronic Article
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ID: ISSN: 1613-6810 ; E-ISSN: 1613-6829 ; DOI: 10.1002/smll.201503167
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recordid: wj10.1002/smll.201503167
title: Robust, Ultra‐Tough Flexible Cathodes for High‐Energy Li–S Batteries
format: Article
creator:
  • Chung, Sheng‐Heng
  • Chang, Chi‐Hao
  • Manthiram, Arumugam
subjects:
  • Battery Chemistry
  • Cell Configurations
  • Energy Storage
  • Li‐S Batteries
  • Porous Electrodes
ispartof: Small, February 2016, Vol.12(7), pp.939-950
description: Sulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The solid–liquid–solid phase transitions generate polysulfide intermediates that are soluble in the commonly used organic solvents in Li–S cells. The resulting severe polysulfide diffusion and the irreversible active‐material loss have been hampering the development of Li–S batteries for years. The present study presents a robust, ultra‐tough, flexible cathode with the active‐material fillings encapsulated between two buckypapers (B), designated as buckypaper/sulfur/buckypaper (B/S/B) cathodes, that suppresses the irreversible polysulfide diffusion to the anode and offers excellent electrochemical reversibility with a low capacity fade rate of 0.06% per cycle after 400 cycles. Engineering enhancements demonstrate that the B/S/B cathodes represent a facile approach for the development of high‐performance sulfur electrodes with a high areal capacity of 5.1 mA h cm, which increases further to approach 7 mA h cm on coupling with carbon‐coated separators. consisting of two layers of buckypaper for storing active‐material fillings in between the conductive electrode architecture demonstrates an overall improvement in the electrochemical utilization and polysulfide retention. Comparative analyses of the B/S/B structural cathodes with increasing sulfur loading and with a carbon‐coated separator provide insights into cathode engineering with high electrochemical performance and attractive active‐material loading.
language:
source:
identifier: ISSN: 1613-6810 ; E-ISSN: 1613-6829 ; DOI: 10.1002/smll.201503167
fulltext: fulltext
issn:
  • 1613-6810
  • 16136810
  • 1613-6829
  • 16136829
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titleRobust, Ultra‐Tough Flexible Cathodes for High‐Energy Li–S Batteries
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subjectBattery Chemistry ; Cell Configurations ; Energy Storage ; Li‐S Batteries ; Porous Electrodes
descriptionSulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The solid–liquid–solid phase transitions generate polysulfide intermediates that are soluble in the commonly used organic solvents in Li–S cells. The resulting severe polysulfide diffusion and the irreversible active‐material loss have been hampering the development of Li–S batteries for years. The present study presents a robust, ultra‐tough, flexible cathode with the active‐material fillings encapsulated between two buckypapers (B), designated as buckypaper/sulfur/buckypaper (B/S/B) cathodes, that suppresses the irreversible polysulfide diffusion to the anode and offers excellent electrochemical reversibility with a low capacity fade rate of 0.06% per cycle after 400 cycles. Engineering enhancements demonstrate that the B/S/B cathodes represent a facile approach for the development of high‐performance sulfur electrodes with a high areal capacity of 5.1 mA h cm, which increases further to approach 7 mA h cm on coupling with carbon‐coated separators. consisting of two layers of buckypaper for storing active‐material fillings in between the conductive electrode architecture demonstrates an overall improvement in the electrochemical utilization and polysulfide retention. Comparative analyses of the B/S/B structural cathodes with increasing sulfur loading and with a carbon‐coated separator provide insights into cathode engineering with high electrochemical performance and attractive active‐material loading.
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descriptionSulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The solid–liquid–solid phase transitions generate polysulfide intermediates that are soluble in the commonly used organic solvents in Li–S cells. The resulting severe polysulfide diffusion and the irreversible active‐material loss have been hampering the development of Li–S batteries for years. The present study presents a robust, ultra‐tough, flexible cathode with the active‐material fillings encapsulated between two buckypapers (B), designated as buckypaper/sulfur/buckypaper (B/S/B) cathodes, that suppresses the irreversible polysulfide diffusion to the anode and offers excellent electrochemical reversibility with a low capacity fade rate of 0.06% per cycle after 400 cycles. Engineering enhancements demonstrate that the B/S/B cathodes represent a facile approach for the development of high‐performance sulfur electrodes with a high areal capacity of 5.1 mA h cm, which increases further to approach 7 mA h cm on coupling with carbon‐coated separators. consisting of two layers of buckypaper for storing active‐material fillings in between the conductive electrode architecture demonstrates an overall improvement in the electrochemical utilization and polysulfide retention. Comparative analyses of the B/S/B structural cathodes with increasing sulfur loading and with a carbon‐coated separator provide insights into cathode engineering with high electrochemical performance and attractive active‐material loading.
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abstractSulfur cathodes have become appealing for rechargeable batteries because of their high theoretical capacity (1675 mA h g). However, the conventional cathode configuration borrowed from lithium‐ion batteries may not allow the pure sulfur cathode to put its unique materials chemistry to good use. The solid–liquid–solid phase transitions generate polysulfide intermediates that are soluble in the commonly used organic solvents in Li–S cells. The resulting severe polysulfide diffusion and the irreversible active‐material loss have been hampering the development of Li–S batteries for years. The present study presents a robust, ultra‐tough, flexible cathode with the active‐material fillings encapsulated between two buckypapers (B), designated as buckypaper/sulfur/buckypaper (B/S/B) cathodes, that suppresses the irreversible polysulfide diffusion to the anode and offers excellent electrochemical reversibility with a low capacity fade rate of 0.06% per cycle after 400 cycles. Engineering enhancements demonstrate that the B/S/B cathodes represent a facile approach for the development of high‐performance sulfur electrodes with a high areal capacity of 5.1 mA h cm, which increases further to approach 7 mA h cm on coupling with carbon‐coated separators. consisting of two layers of buckypaper for storing active‐material fillings in between the conductive electrode architecture demonstrates an overall improvement in the electrochemical utilization and polysulfide retention. Comparative analyses of the B/S/B structural cathodes with increasing sulfur loading and with a carbon‐coated separator provide insights into cathode engineering with high electrochemical performance and attractive active‐material loading.
doi10.1002/smll.201503167
pages939-950
date2016-02