Bifunctional Redox Mediator Supported by an Anionic Surfactant for Long-Cycle Li–O2 Batteries,ACS Energy Letters

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Bifunctional Redox Mediator Supported by an Anionic Surfactant for Long-Cycle Li–O2 Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-10-30 00:00:00 , DOI: 10.1021/acsenergylett.7b00884
Chengyang Xu ₁ , Guiyin Xu ₁ , Yadi Zhang ₁ , Shan Fang ₁ , Ping Nie ₁ , Langyuan Wu ₁ , Xiaogang Zhang ₁

Affiliation

Although the soluble redox mediator (RM) has been effectively applied in Li–O₂ batteries, parasitic reactions between the lithium anode and RM⁺ can result in poor cycle performance. Herein, we proposed a nonelectroactive surfactant (sodium dodecyl sulfate, SDS) that could adsorb on the hydrophobic carbon surface and form a stable anionic layer upon charge, which can effectively suppress the diffusion of oxidized RM⁺ and facilitate charge transfer at the electrode–solution interface. To coordinate with SDS, a new RM named 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (PTIO) was adopted due to its oxidation process following after in situ formation of the anionic layer. Moreover, as a bifunctional mediator, PTIO cannot only get a low charge plateau but also greatly enhance the discharge capacity when applied in Li–O₂ batteries. The electrochemical results demonstrated that the cycling performance, energy efficiency, and discharge capacity were significantly improved owing to the synergistic effect of PTIO and SDS.

中文翻译：

阴离子表面活性剂支持的双功能氧化还原介体，用于长周期Li–O ₂电池

尽管可溶性氧化还原介体（RM）已有效地应用于Li-O ₂电池，但锂阳极与RM ⁺之间的寄生反应可能导致较差的循环性能。本文中，我们提出了一种非电活性表面活性剂（十二烷基硫酸钠，SDS），该表面活性剂可以吸附在疏水性碳表面上，并在充电后形成稳定的阴离子层，可以有效抑制氧化的RM ⁺的扩散。并促进电极-溶液界面处的电荷转移。为了与SDS配合，由于原位形成阴离子层之后的氧化过程，采用了一种新的RM，称为2-苯基-4,4,5,5-四甲基咪唑啉-1-氧基1-3氧化物（PTIO）。此外，作为双功能介体，PTIO在Li-O ₂电池中使用时，不仅充电平台稳定，而且放电容量大大提高。电化学结果表明，由于PTIO和SDS的协同作用，循环性能，能效和放电容量得到了显着改善。

更新日期：2017-10-30

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