College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , 1# Dongsanlu, Erxianqiao , Chengdu 610059 , Sichuan , P. R. China.
Institute for Superconducting and Electronic Materials , University of Wollongong , Squires Way , North Wollongong , New South Wales 2500 , Australia.
ACS Appl Mater Interfaces. 2019 Jan 30;11(4):3834-3842. doi: 10.1021/acsami.8b15699. Epub 2019 Jan 17.
In this work, a novel free-standing CuCoS nanosheet cathode (CuCoS@Ni) with high catalytic activity is fabricated for aprotic lithium-oxygen (Li-O) battery. This deliberately designed oxygen electrode is found to yield lower overpotential (0.82 V), improved specific capacity (9673 mA h g at 100 mA g), and enhanced cycle life (164 cycles) as compared to the traditional carbonaceous electrode. The improved performance can be ascribed to the superb spinel structure of CuCoS, in which both Cu and Co exhibit more abundant redox properties, improving oxygen reduction reaction and oxygen evolution reaction kinetics effectively and boosting the electrochemical reactions. Furthermore, the well-designed architecture also plays a critical role in the improved performance. Encouraged by the excellent catalytic activity of this free-standing cathode, large-scale pouch-type Li-O cell based on CuCoS@Ni cathode is fabricated and can work under different bending and twisting conditions. This free-standing electrode provides a new strategy for developing Li-O batteries with excellent performance and flexible wearable devices.
在这项工作中，制备了一种新型的独立式 CuCoS 纳米片阴极（CuCoS@Ni），用于非质子锂-氧（Li-O）电池。与传统的碳质电极相比，这种经过精心设计的氧电极具有更低的过电位（0.82 V）、更高的比容量（在 100 mA g 时为 9673 mA h g）和更长的循环寿命（164 次循环）。改进后的性能可归因于 CuCoS 的卓越尖晶石结构，其中 Cu 和 Co 表现出更丰富的氧化还原性质，有效地改善了氧还原反应和氧析出反应动力学，并促进了电化学反应。此外，精心设计的结构也在改善性能方面发挥了关键作用。受这种独立阴极出色催化活性的鼓舞，基于 CuCoS@Ni 阴极的大型袋式 Li-O 电池得以制备，并可在不同弯曲和扭曲条件下工作。这种独立电极为开发具有优异性能和灵活可穿戴设备的 Li-O 电池提供了一种新策略。
