Scalable Study on Nanostructured Carbon – Sulfur Composite Electrodes for High Energy Lithium Sulfur (Li-S) Battery. (7th July 2017)

• Record Type: Journal Article
• Authors: Tripathi, Balram; Martinez, Monika Lopez Victoria; Katiyar, Rajesh Kumar; Sharma, K.B.; Katiyar, Ram S
• Is Part Of: ECS transactions. Volume 77:Number 11(2017)
• Page Start: 47
• Page End: 57
• Publication Date: 2017-07-07
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07711.0047ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Sulfur is a promising cathode material for lithium sulfur batteries due to its high theoretical capacity (1675 mAh/g). Sulfur cathodes generally suffers from fast capacity degradation and poor Coulombic efficiency originated from the dissolution of intermediate discharge products (polysulfides, Li2 S) in the electrolyte. The polysulfide dissolution causes loss of active sulfur and suppresses its deep lithiation, which becomes especially severe during slow charge−discharge processes and deteriorates electrochemical performances at low cycling rates. To enhance the electrochemical performance of sulfur, carbon black as conductive material has been dispersed in sulfur. Here we report a scalable study on nanostructured carbon-sulfur (S1-x Cx where x=.25, .35 &.40 etc.) composites as a cathode fabricated by ball-milling technique for lithium sulfur batteries. The characterization of these nanostructured composites have been performed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and RAMAN spectroscopy. The electrochemical performance of C-sulfur composite cathodes have been found to be enhanced and stable at deep charge-discharge.