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. 2016 Nov 23;9(22):3206-3212.
doi: 10.1002/cssc.201601032. Epub 2016 Oct 31.

New Redox Polymers that Exhibit Reversible Cleavage of Sulfur Bonds as Cathode Materials

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New Redox Polymers that Exhibit Reversible Cleavage of Sulfur Bonds as Cathode Materials

Marya Baloch et al. ChemSusChem. .

Abstract

Two new cathode materials based on redox organosulfur polymers were synthesized and investigated for rechargeable lithium batteries as a proof-of-concept study. These cathodes offered good cycling performance owing to the absence of polysulfide solubility, which plagues Li/S systems. Herein, an aliphatic polyamine or a conjugated polyazomethine was used as the base to tether the redox-active species. The activity comes from the cleavage and formation of S-S or N-S bonds, which is made possible by the rigid conjugated backbone. The synthesized polymers were characterized through FTIR spectroscopy and thermogravimetric analysis (TGA). Galvanostatic measurements were performed to evaluate the discharge/charge cycles and characterize the performance of the lithium-based cells, which displayed initial discharge capacities of approximately 300 mA h g-1 at C/5 over 100 cycles with approximately 98 % Coulombic efficiency.

Keywords: cathode materials; electrochemistry; lithium; polymers; sulfur heterocycles.

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