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Energies 2014, 7(7), 4588-4600; doi:10.3390/en7074588
Discussion

Understanding of Sulfurized Polyacrylonitrile for Superior Performance Lithium/Sulfur Battery

Electrochemistry Branch, RDRL-SED-C, Sensors and Electron Devices Directorate, U.S. Army Research Laboratory, Adelphi, MD 20783-1197, USA
Received: 20 May 2014 / Revised: 17 June 2014 / Accepted: 10 July 2014 / Published: 18 July 2014
(This article belongs to the Special Issue Electrochemical Energy Storage—Battery and Capacitor)
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Abstract

Sulfurized polyacrylonitrile (SPAN) is one of the most important sulfurized carbon materials that can potentially be coupled with the carbonaceous anode to fabricate a safe and low cost “all carbon” lithium-ion battery. However, its chemical structure and electrochemical properties have been poorly understood. In this discussion, we analyze the previously published data in combination with our own results to propose a more reasonable chemical structure that consists of short –Sx– chains covalently bonded onto cyclized, partially dehydrogenated, and ribbon-like polyacrylonitrile backbones. The proposed structure fits all previous structural characterizations and explains many unique electrochemical phenomena that were observed from the Li/SPAN cells but have not been understood clearly.
Keywords: lithium-sulfur battery; sulfur cathode; sulfurized carbon; sulfurized polyacrylonitrile; polysulfide lithium-sulfur battery; sulfur cathode; sulfurized carbon; sulfurized polyacrylonitrile; polysulfide
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Zhang, S.S. Understanding of Sulfurized Polyacrylonitrile for Superior Performance Lithium/Sulfur Battery. Energies 2014, 7, 4588-4600.

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