Unraveling reaction discrepancy and electrolyte stabilizing effects of auto-oxygenated porphyrin catalysts in lithium-oxygen and lithium-air cells  

作　　者：Boran Kim Hyunyoung Park Hyun-Soo Kim Jun Seo Lee Jongsoon Kim Won-Hee Ryu 

机构地区：[1]Department of Chemical and Biological Engineering,Sookmyung Women's University,Yongsan-gu,Seoul,Republic of Korea [2]Department of Energy Science,Sungkyunkwan University,Jangan-gu,Suwon,Republic of Korea [3]SKKU Institute of Energy Science and Technology(SIEST),Sungkyunkwan University,Jangan-gu,Suwon,Republic of Korea

出　　处：《Carbon Energy》2024年第12期90-101,共12页碳能源(英文)

基　　金：National Research Foundation of Korea,Grant/Award Numbers:2022M3J1A1085410,RS-2023-00208983。

摘　　要：Lithium-oxygen(Li-O_(2))batteries are an emerging energy storage alternative with the potential to meet the recent increase in demand for high-energy-density batteries.From a practical viewpoint,lithium-air(Li-Air)batteries using ambient air instead of pure oxygen could be the final goal.However,the slow oxygen reduction and evolution reactions interfere with reversible cell operation during cycling.Therefore,research continues to explore various catalyst materials.The present study attempts to improve the performance of Li-Air batteries by using porphyrin-based materials known to have catalytic effects in Li-O_(2) batteries.The results confirm that the iron phthalocyanine(FePc)catalyst not only exhibits a catalytic effect in an air atmosphere with a low oxygen fraction but also suppresses electrolyte decomposition by stabilizing superoxide radical ions(O_(2)^(−))at a high voltage range.Density functional theory calculations are used to gain insight into the exact FePc-mediated catalytic mechanism in Li-Air batteries,and various ex situ and in situ analyses reveal the reversible reactions and structural changes in FePc during electrochemical reaction.This study provides a practical solution to ultimately realize an air-breathing battery using nature-friendly catalyst materials.

关 键 词：catalyst lithium-air battery lithium-oxygen battery PHTHALOCYANINE redox mediator 

分 类 号：TM911.41[电气工程—电力电子与电力传动] O643.36[理学—物理化学]