New Redox Polymers that Exhibit Reversible Cleavage of Sulfur Bonds as Cathode Materials
New Redox Polymers that Exhibit Reversible Cleavage of Sulfur Bonds as Cathode Materials
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DOI：
10.1002/cssc.201601032
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发表时间：
2016-11-23
期刊：
影响因子：
8.4
通讯作者：
Armand, Michel
中科院分区：
文献类型：
--
作者：
Baloch, Marya;Ben Youcef, Hicham;Armand, Michel
合成了两种基于氧化还原有机硫聚合物的新型阴极材料，并对其用于可充电锂电池进行了概念验证研究。由于没有多硫化物的溶解性，这些阴极提供了良好的循环性能，这是困扰Li/S系统的问题。本文采用脂肪族多胺或偶联聚亚胺作为底物拴住氧化还原活性物质。活性来自于S-S或N-S键的裂解和形成，这是由刚性共轭主链实现的。通过红外光谱和热重分析（TGA）对合成的聚合物进行了表征。通过恒流测量来评估放电/充电循环，并表征锂基电池的性能，在C/5下进行100次循环，其初始放电容量约为300 mAhg(-1)，库仑效率约为98%。
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 mAhg(-1) at C/5 over 100 cycles with approximately 98% Coulombic efficiency.