Affiliation of Author(s):材料科学与技术学院
Journal:ACS Energy Lett.
Abstract: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. © 2017 American Chemical Society.
Translation or Not:no
Date of Publication:2017-12-08
Co-author:Xu, Chengyang,Xu, Guiyin,Zhang, Yadi,Nie, Ping,Wu, Langyuan,Zhang Xiaogang
Correspondence Author:fangshan
Date of Publication:2017-12-08