Self-Catalyzed Rechargeable Lithium-Air Battery by in situ Metal Ion Doping of Discharge Products: A Combined Theoretical and Experimental Study  

作　　者：Mengwei Yuan Zemin Sun Han Yang Di Wang Qiming Liu Caiyun Nan Huifeng Li Genban Sun Shaowei Chen 

机构地区：[1]Beijing Key Laboratory of Energy Conversion and Storage Materials Institution,College of Chemistry,Beijing Normal University,Beijing 100875,China [2]Department of Physics and Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing 100875,China [3]Department of Chemistry and Biochemistry,University of California,1156 High Street,Santa Cruz CA 95064,USA

出　　处：《Energy & Environmental Materials》2023年第1期129-137,共9页能源与环境材料（英文）

基　　金：This project was supported by the National Natural Science Foundations of China (21771024,and 21871028);China Postdoctoral Science Foundation (2020M680430).

摘　　要：Lithium-air battery has emerged as a viable electrochemical energy technology;yet a substantial overpotential is typically observed,due to the insulating nature of the discharge product Li_(2)O_(2) that hinders the reaction kinetics and device performance.Furthermore,finite solid–solid/-liquid interfaces are formed between Li_(2)O_(2) and catalysts and limit the activity of the electrocatalysts in battery reactions,leading to inadequate electrolytic efficiency.Herein,in-situ doping of Li_(2)O_(2) by select metal ions is found to significantly enhance the lithium-air battery performance,and Co^(2+)stands out as the most effective dopant among the series.This is ascribed to the unique catalytic activity of the resulting Co-O_(x) sites towards oxygen electrocatalysis,rendering the lithium-air battery self-catalytically active.Theoretical studies based on density functional theory calculations show that structural compression occurs upon Co^(2+)doping,which lowers the energy barrier of Li_(2)O_(2) decomposition.Results from this study highlight the significance of in situ electrochemical doping of the discharge product in enhancing the performance of lithium-air battery.

关 键 词：Co^(2+)-doped Li_(2)O_(2) density functional theory in situ electrochemical doping lithium-air battery self-catalysis 

分 类 号：TM912[电气工程—电力电子与电力传动]