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Improved lithium-sulfur cells with a treated carbon paper interlayer.
MedLine Citation:
PMID:  23292035     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A simple, low-cost modification of lithium-sulfur (Li-S) cells by placing a treated carbon paper between the sulfur electrode and the separator has been investigated to significantly improve the performance of Li-S cells. The treated carbon paper was prepared by an alcohol-alkaline/thermal treatment of a commercial Toray carbon paper, introducing hydroxyl functional groups and micro-cracks on the carbon fibers in the carbon paper, which enhances the hydrophilicity and increases surface areas of the carbon paper matrix. The modified Li-S cells deliver a higher initial capacity of 1651 mAh g(-1) at 1.5-2.8 V at a rate of C/5 compared to the cells without any interlayer or with an untreated carbon paper interlayer. The cells with the treated carbon paper offer additional improvement in performance when the discharge cut-off voltage is raised to 1.8 V: 1057, 1002, and 929 mAh g(-1) after 100 cycles, respectively, at C/5, C/2, and 1 C rates. The improved cell performance is attributed to the 3D architecture of the carbon paper interlayer, serving as a conductive skeleton for trapping and depositing dissolved sulfur-containing active materials, as confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The novel configuration presented here offers a low-cost approach to overcome the persistent problems of Li-S cells.
Authors:
Chenxi Zu; Yu-Sheng Su; Yongzhu Fu; Arumugam Manthiram
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-7
Journal Detail:
Title:  Physical chemistry chemical physics : PCCP     Volume:  -     ISSN:  1463-9084     ISO Abbreviation:  Phys Chem Chem Phys     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888160     Medline TA:  Phys Chem Chem Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA. manth@austin.utexas.edu.
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