Enhanced cycle stability of aprotic Li-O2 batteries based on a self-defensed redox mediator

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外文摘要：LiBr as a promising redox mediator(RM)has been applied in Li-O2 batteries to improve oxygen evo-lution reaction kinetics and reduce overpotentials.However,the redox shuttle of Br3-can induce the unexpected reactions and thus cause the degradation of LiBr and the corrosion of Li anode,resulting in the poor cyclability and the low round-trip efficiency.Herein,MgBr2 is firstly employed with dual func-tions for Li-O2 batteries,which can serve as a RM and a SEI film-forming agent.The Br-is beneficial to facilitating the decomposition of Li2O2 and thus decreasing the overpotential.Additionally,a uniform SEI film containing Mg and MgO generates on Li anode surface by the in-situ spontaneous reactions of Mg2+and Li anode in an O2 environment,which can suppress the redox shuttle of Br3-and improve the inter-face stability of Li anode and electrolyte.Benefiting from these advantages,the cycle life of Li-O2 battery with MgBr2 electrolyte is significantly extended.

外文关键词：

MgBr2Redox mediatorRedox shuttleLi anodeSEI film

作者：

Guiru Sun、Yan Wang、Daming Yang、Zexu Zhang、Wei Lu、Ming Feng

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作者单位：

Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China

College of Information Technology,Jilin Engineering Research Center of Optoelectronic Materials and Devices,Jilin Normal University,Siping 136000,China

基金：

国家自然科学基金国家自然科学基金Jilin Province Science and Technology Department ProgramJilin Province Science and Technology Department ProgramJilin Province Science and Technology Department ProgramScience and Technology Project of Jilin Provincial Education Department

项目编号：

2197811052171210YDZJ202101ZYTS04720220201130GX20200201187JCJJKH20210444KJ

出版年：

2024

DOI：

10.1016/j.cclet.2023.108469

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(3)

参考文献量47