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A new covalently linked ferrocene-containing organosulfur cathode material for high stability lithium–sulfur batteries
Journal of Materials Chemistry A ( IF 11.9 ) Pub Date : 2022-11-10 , DOI: 10.1039/d2ta06807a
Zhenfeng Li, Yu Lu, Qinghui Zeng, Yu Liu, Anqi Chen, Jiazhu Guan, Honghao Wang, Jiancheng Wang, Zhixiang Wang, Liaoyun Zhang

Organic sulfur cathodes which received a great deal of attention have still been limited by their poor electrical conductivity, poor redox kinetics and low loading in the field of lithium–sulfur (Li–S) batteries. Herein, a kind of cathode with ferrocene covalently linked to double-bond carbon nanotubes and sulfur (S–Ferrocene acetylene–dbCNT) has been obtained for the first time through a thermal treatment strategy. It is found that the cell with the S–Ferrocene acetylene–dbCNT cathode does not produce soluble long-chain polysulfides during the charging–discharging process, which can effectively mitigate the shuttle effect. Besides, thanks to the covalently linked structure and the absorption/catalysis of ferrocene, the cell with this cathode exhibits good capacity retention of 93.79% after 400 cycles. Even with a sulfur loading of 8.93 mg cm−2, the cell can display good capacity. It is worth noting that the cell with the S–Ferrocene acetylene–dbCNT cathode can also show extraordinary performance at low temperature, which is rarely reported for lithium–sulfur batteries. This work can not only provide an effective strategy to inhibit the shuttle effect by the combination of covalently linking sulfur and promoting the conversion of LiPS, but also plays a guiding role in the preparation of Li–S batteries with high stability, high loading and excellent low-temperature performance.

中文翻译:

一种用于高稳定性锂硫电池的新型共价连接二茂铁有机硫正极材料

受到广泛关注的有机硫正极在锂硫(Li-S)电池领域仍然受到其导电性差、氧化还原动力学差和低负载的限制。在此,通过热处理策略首次获得了一种二茂铁与双键碳纳米管和硫共价连接的阴极(S-二茂铁乙炔-dbCNT)。发现S-二茂铁乙炔-dbCNT正极的电池在充放电过程中不会产生可溶性长链多硫化物,可以有效缓解穿梭效应。此外,由于共价连接结构和二茂铁的吸收/催化作用,采用这种正极的电池在 400 次循环后表现出良好的容量保持率,达到 93.79%。即使硫含量为 8.93 mg cm-2,电池可以显示出良好的容量。值得注意的是,S-二茂铁乙炔-dbCNT正极的电池在低温下也能表现出非凡的性能,这在锂硫电池中很少见。该工作不仅可以通过共价连接硫和促进LiPS的转化为抑制穿梭效应提供有效的策略,而且对制备高稳定性、高负载和优异性能的Li-S电池具有指导作用。低温性能。
更新日期:2022-11-10
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