SnBr2 as a self-defense redox mediator enhances the cycle stability in lithium‑oxygen batteries

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-10-08 DOI:10.1016/j.jelechem.2025.119526

Zhongyu Huang , Xinxin Zhuang , Tianle Li , Qianyan Wang , Menglin Gao , Yaling Liao , Xiaoping Zhang

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引用次数: 0

Abstract

Redox mediator is used to reduce the overpotential of lithium‑oxygen batteries by effectively accelerating the decomposition of the discharge product Li₂O₂. Unfortunately, the oxidized redox mediator diffuses to the anode and deteriorates the lithium metal surface. The so-called shuttle effect not only leads to the consumption of the redox mediator but also causes the degradation of cycle stability. Thus, we propose a self-defense redox mediator, tin (II) bromide (SnBr₂), to counter this problem. It can generate Br⁻/Br₃⁻ redox couple in lithium‑oxygen batteries to lower the overpotential and form a uniform Sn-rich layer on the lithium anode surface to resist the attack of Br₃⁻, thereby stabilizing the lithium metal anode. As a result, the lithium‑oxygen batteries with SnBr₂ show significantly improved energy efficiency and cycle performance.

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SnBr2作为自卫氧化还原介质增强了锂氧电池的循环稳定性

氧化还原介质通过有效加速放电产物Li2O2的分解来降低锂氧电池的过电位。不幸的是，氧化的氧化还原介质扩散到阳极并使锂金属表面恶化。所谓的穿梭效应不仅会导致氧化还原介质的消耗，而且会导致循环稳定性的下降。因此，我们提出了一种自卫氧化还原介质，锡（II）溴化（SnBr2），以解决这个问题。它可以在锂氧电池中生成Br−/Br3−氧化还原对，降低过电位，在锂阳极表面形成均匀的富锡层，抵抗Br3−的攻击，从而稳定锂金属阳极。结果表明，含SnBr2的锂氧电池的能量效率和循环性能显著提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.