Transition of the Reaction from Three‐Phase to Two‐Phase by Using a Hybrid Conductor for High‐Energy‐Density High‐Rate Solid‐State Li‐O2 Batteries. (8th February 2021)

• Record Type: Journal Article
• Authors: Zhao, Changtai; Zhu, Yuanmin; Sun, Qian; Wang, Changhong; Luo, Jing; Lin, Xiaoting; Yang, Xiaofei; Zhao, Yang; Li, Ruying; Zhao, Shangqian; Huang, Huan; Zhang, Li; Lu, Shigang; Gu, Meng; Sun, Xueliang
• Is Part Of: Angewandte Chemie. Volume 133:Number 11(2021)
• Page Start: 5885
• Page End: 5890
• Publication Date: 2021-02-08
• Subjects: air electrodes -- hybrid conductors -- in situ TEM -- interfaces -- solid-state Li-O2 batteries; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202014061
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Solid‐state Li‐O2 batteries possess the ability to deliver high energy density with enhanced safety. However, designing a highly functional solid‐state air electrode is the main bottleneck for its further development. Herein, we adopt a hybrid electronic and ionic conductor to build solid‐state air electrode that makes the transition of Li‐O2 battery electrochemical mechanism from a three‐phase process to a two‐phase process. The solid‐state Li‐O2 battery with this hybrid conductor solid‐state air electrode shows decreased interfacial resistance and enhanced reaction kinetics. The Coulombic efficiency of Li‐O2 battery is also significantly improved, benefiting from the good contact between discharge products and electrode materials. In situ environmental transmission electron microscopy under oxygen was used to illustrate the reversible deposition and decomposition of discharge products on the surface of this hybrid conductor, visually verifying the two‐phase reaction. Abstract : A hybrid electronic and ionic conductor was proposed to build a solid‐state air electrode that transforms the solid‐state Li‐O2 battery electrochemical mechanism from a three‐phase to a two‐phase process and further enhances the battery performance. The electrochemical effect of the hybrid conductor was shown by an in situ environmental transmission electron microscopy process.