Dhawa, Tanumoy and Chattopadhyay, Shreyasi and Sreemany, Monjoy and De, Goutam and Mahanty, Sourindra (2018) Influence of C-S interactions on the electrochemical performance of -COOH functionalized MWCNT/S composites as lithium-sulfur battery cathode. Journal of Chemical Sciences, 130 (8). Article No-UNSP 109. ISSN 0253-4134

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Effective trapping of polysulfides within the carbon cathode host strongly depends on intrinsic C-S interactions. We report herein a systematic study of the influence of S-loading process on C-S interactions in MWCNT/S composites prepared by three commonly used industry-friendly methods, namely, mechanical solid-state mixing, infiltration method from a solution of S in CS, and chemical deposition by disproportionation reaction of sodium sulfide and sodium thiosulfate. FESEM and TEM studies reveal strikingly different morphologies of the resulting MWCNT/S composites. XPS and Raman studies indicate different extents of recovery of bonds in MWCNT due to varying degrees of C-S interfacial interactions in the composites. Furthermore, it is found that the C/O atomic ratio in the composites plays a crucial role: the higher the C/O value the better is the S-confinement. These subtle physical changes induced by C-S interactions in the composites can be related to electrochemical performance when tested in Li-S coin cells. It is found that the best results (high initial capacity of 1143 mAh g and better capacity retention) could be achieved when the solution infiltration method was used for S-loading. This conclusion is further validated by using activated carbon as S-host. SYNOPSIS MWCNT/sulfur composites with different S-loading methods have been investigated by XPS and Raman studies. The electrochemical performance in Li-S battery is correlated with different degrees of recovery of bonds in MWCNT and the C/O atomic ratio in the composites due to a varying extent of C-S interactions.

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 30 Oct 2018 11:11
Last Modified: 30 Oct 2018 11:11
URI: http://cgcri.csircentral.net/id/eprint/4400

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