Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology Sydney, Sydney, NSW, 2007, Australia.
Angew Chem Int Ed Engl. 2017 Jul 10;56(29):8505-8509. doi: 10.1002/anie.201703784. Epub 2017 May 23.
Large over-potentials owing to the sluggish kinetics of battery reactions have always been the drawbacks of Li-O batteries, which lead to short cycle life. Although redox mediators have been intensively investigated to overcome this issue, side-reactions are generally induced by the solvated nature of redox mediators. Herein, we report an alternative method to achieve more efficient utilization of tetrathiafulvalene (TTF) in Li-O batteries. By coordinating TTF with LiCl during charging, an organic conductor TTF Cl precipitate covers Li O to provide an additional electron-transfer pathway on the surface, which can significantly reduce the charge over-potential, improve the energy efficiency of Li-O batteries, and eliminate side-reactions between the lithium metal anode and TTF . When a porous graphene electrode is used, the Li-O battery combined with TTF and LiCl shows an outstanding performance and prolonged cycle life.
由于电池反应动力学缓慢，过大的过电位一直是锂氧电池的缺点，这导致其循环寿命较短。虽然氧化还原介体已经被深入研究以克服这个问题，但氧化还原介体的溶解性质通常会引起副反应。在此，我们报告了一种在锂氧电池中更有效地利用四硫富瓦烯（TTF）的替代方法。通过在充电过程中使 TTF 与 LiCl 配位，TTF Cl 沉淀物覆盖 Li O 以提供表面上的额外电子转移途径，这可以显著降低充电过电位，提高锂氧电池的能量效率，并消除锂金属阳极和 TTF 之间的副反应。当使用多孔石墨烯电极时，结合 TTF 和 LiCl 的锂氧电池表现出优异的性能和延长的循环寿命。
