Redox catalysts for aprotic Li-O2 batteries: Toward a redox flow system

论文摘要

Large-scale electrical energy storage with high energy density and round-trip efficiency is important to the resilience of power grids and the effective use of intermittent renewable energy such as solar and wind. Lithiumoxygen battery, due to its high energy density, is believed to be one of the most promising energy storage systems for the future. However, large overpotentials, poor cycling stability, and degradation of electrolytes and cathodes have been hindering the development of lithium-oxygen batteries. Numerous heterogeneous oxygen electrocatalysts have been investigated to lower the overpotentials and enhance the cycling stability of lithium-oxygen batteries. Unfortunately, the prevailing issues of electrode passivation and clogging remain. Over the past few years, redox mediators were explored as homogenous catalysts to address the issues, while only limited success has been achieved for these soluble catalysts. In conjunction with a flowing electrolyte system, a new redox flow lithium-oxygen battery（RFLOB） has been devised to tackle the aforementioned issues. The working mechanism and schematic processes will be elaborated in this review. In addition, the performance gap of RFLOB with respect to practical requirements will be analysed. With the above, we anticipate RFLOB would be a credible solution for the implementation of lithium-oxygen battery chemistry for the next generation energy storage.

论文目录

• 1. Introduction
• 2. Heterogeneous electrocatalysts
• 3. Early attempts of using redox catalysis for oxygen reduction reactions in fuel cells
•   3.1. Redox mediators（RMs）in microbial fuel cell
•   3.2. Redox catalysis in fuel cells
• 4. Redox catalysis for Li-O2batteries
•   4.1. Working principle of redox mediators in Li-O2batteries
•   4.2. ORR redox mediators
•   4.3. OER redox mediators
•   4.4. Bi-functional redox mediators
•   4.5. Redox-mediated Li-O2battery chemistry in the presence of protons
• 5. The design of redox flow Li-O2battery（RFLOB）
• 6. Challenges and opportunities

文章来源

类型: 期刊论文

作者: YunGuang Zhu,F.W.Thomas Goh,Qing Wang

来源: Nano Materials Science 2019年03期

年度: 2019

分类: 工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 化学,无机化工,电力工业

单位: Department of Materials Science and Engineering, Faculty of Engineering, National University of Singapore

基金: supported by the National Research Foundation,Prime Minister’s Office,Singapore,under its Competitive Research Program (CRP Awards No.NRF-CRP10-2012-06)

分类号: O643.36;TM911.41

页码: 173-183

总页数: 11

文件大小: 3623K

下载量: 6