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

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 alip...

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Bibliographic Details
Published in:ChemSusChem 2016-11, Vol.9 (22), p.3206-3212
Main Authors: Baloch, Marya, Ben Youcef, Hicham, Li, Chunmei, Garcia-Calvo, Oihane, Rodriguez, Lide M., Shanmukaraj, Devaraj, Rojo, Teofilo, Armand, Michel
Format: Article
Language:English
Subjects:
Aliphatic compounds
cathode materials
Cathodes
Cleavage
Discharge
Electrochemistry
Electrodes
Kinetics
Lithium
Oxidation-Reduction
Polyazomethines
Polymers
Polymers - chemistry
Sulfur
Sulfur - chemistry
sulfur heterocycles
Synthesis (chemistry)
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Summary: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. Cycling sulfur cycles: A proof‐of concept study of two new redox organosulfur polymers is undertaken. An aliphatic polyamine or conjugated polyazomethine is used as the base to tether the redox‐active species. These cathodes show promising electrochemical activity based on the cleavage and formation of N−S or S−S bonds during the discharge and charge cycles and, thus, pave the way towards solutions for some important issues that plague Li‐based batteries.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201601032