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Facile Synthesis of Uniform Carbon Coated Li2S/rGO cathode for High-Performance Lithium-Sulfur Batteries

Published online by Cambridge University Press:  07 May 2018

Gaind P. Pandey Open the ORCID record for Gaind P. Pandey [Opens in a new window] ,
Joshua Adkins  and
Lamartine Meda
Gaind P. Pandey*
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125
Joshua Adkins
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125
Lamartine Meda
Affiliation:
Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125
*
*(Email: [email protected])
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Abstract

Lithium sulfide (Li2S) is one of the most attractive cathode materials for high energy density lithium batteries as it has a high theoretical capacity of 1166 mA h g-1. However, Li2S suffers from poor rate performance and short cycle life due to its insulating nature and polysulfide shuttle during cycling. In this work, we report a facile and viable approach to address these issues. We propose a method to synthesize a Li2S based nanocomposite cathode material by dissolving Li2S as the active material, polyvinylpyrrolidone (PVP) as the carbon precursor, and graphene oxide (GO) as a matrix to enhance the conductivity, followed by a co-precipitation and high-temperature carbonization process. The Li2S/rGO cathode yields an exceptionally high initial capacity of 817 mAh g-1 based on Li2S mass at C/20 rate and also shows a good cycling performance. The carbon-coated Li2S/rGO cathode demonstrates the capability of robust core-shell nanostructures for different rates and improved capacity retention, revealing carbon coated Li2S/rGO composites as an outstanding system for high-performance lithium-sulfur batteries.

Keywords

chemical synthesiscore/shellenergy storage
Type
Articles
Information
MRS Advances , Volume 3 , Issue 60: Energy Materials and Technologies , 2018 , pp. 3501 - 3506
Copyright
Copyright © Materials Research Society 2018 

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References

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