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CNFs/S1-xSex Composites as Promising Cathode Materials for High-Energy Lithium-Sulfur Batteries

Published online by Cambridge University Press:  22 February 2019

Gaind P. Pandey Open the ORCID record for Gaind P. Pandey [Opens in a new window] ,
Kobi Jones  and
Lamartine Meda
Gaind P. Pandey*
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA70125
Kobi Jones
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA70125
Lamartine Meda
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA70125
*
*(Email: [email protected])
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Abstract

High-energy lithium-sulfur (Li-S) batteries still suffer from poor rate capability and short cycle life caused by the polysulfides shuttle and insulating nature of S (and the discharge product, Li2S). Selenium disulfide (SeS2), with a theoretical specific capacity of 1342 mAh g−1, is a promising cathode material as it has better conductivity compared to sulfur. The electrochemical reaction kinetics of CNFs-S/SeS2 composites (denoted as CNFs/S1-xSex, where x ≤ 0.1) are expected to be remarkably improved because of the better conductivity of SeS2 compared to sulfur. Here, a high-performance composite cathode material of CNFs/S1-xSex for novel Li-S batteries is reported. The CNFs/S1-xSex composites combine the higher conductivity and higher density of SeS2 with high specific capacity of sulfur. The CNFs/S1-xSex electrode shows good initial discharge capacity of ∼1050 mAh g−1 at 0.05 C rate with high mass loading of materials (∼6-7 mg cm−2 of composites) and > 97% initial coulombic efficiency. The CNFs/S1-xSex electrode shows more than 600 mAh g-1 specific capacity after 50 charge-discharge cycles at 0.5C rate, much higher compared to the CNFs/S cathodes.

Keywords

energy storageLiS
Type
Articles
Information
MRS Advances , Volume 4 , Issue 14: Energy-Transfer, Storage and Conversion , 2019 , pp. 821 - 828
Copyright
Copyright © Materials Research Society 2019 

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