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

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外文摘要：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 Li2O2 that hinders the reaction kinetics and device performance.Furthermore,finite solid-solid/-liquid interfaces are formed between Li2O2 and catalysts and limit the activity of the electrocatalysts in battery reactions,leading to inadequate electrolytic efficiency.Herein,in-situ doping of Li2O2 by select metal ions is found to significantly enhance the lithium-air battery performance,and Co2+stands out as the most effective dopant among the series.This is ascribed to the unique catalytic activity of the resulting Co-Ox 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 Co2+doping,which lowers the energy barrier of Li2O2 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.

外文关键词：

Co2+-doped Li2O2density functional theoryin situ electrochemical dopinglithium-air batteryself-catalysis

作者：

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

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作者单位：

Beijing Key Laboratory of Energy Conversion and Storage Materials Institution,College of Chemistry,Beijing Normal University,Beijing 100875,China

Department of Physics and Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing 100875,China

Department of Chemistry and Biochemistry,University of California,1156 High Street,Santa Cruz CA 95064,USA

基金：

National Natural Science Foundations of ChinaNational Natural Science Foundations of ChinaChina Postdoctoral Science Foundation

项目编号：

21771024218710282020M680430

出版年：

2023

DOI：

10.1002/eem2.12258

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(1)

被引量2
参考文献量73