CsI as Multifunctional Redox Mediator for Enhanced Li–Air Batteries
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- 作者：Chan Kyu Lee ; Yong Joon Park
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：April 6, 2016
- 年：2016
- 卷：8
- 期：13
- 页码：8561-8567
- 全文大小：511K
- ISSN：1944-8252
文摘
We introduce CsI as a multifunctional redox mediator to enhance the performance of Li–air batteries. CsI dissolved in the electrolyte is ionized into Cs+ and I–, which perform their roles in the Li anode and air electrode, respectively. The I– ions in the electrolyte facilitate the dissolution of Li2O2 in the air electrode as a redox mediator, which reduces the overpotential of the cell. The low overpotential also leads to the suppression of parasitic reactions occurring in the high-voltage range, such as the decomposition of the electrolyte and the reaction between Li2O2 and carbon. At the same time, the Cs+ ions act as an electrostatic shield at the sharp points of the Li anode, hindering the growth of Li dendrite. The combined effects of reduced parasitic reactions and hindered Li-dendrite growth successfully improve the cyclic performance of Li–air cells.