Utilizing the Mn(II) Dissolution Induced Vacancy for Optimum Mg2+ Storage of Spinel Mn3O4.

IF 16.1 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Angewandte Chemie International Edition Pub Date : 2025-05-16 DOI:10.1002/anie.202503535

Zhongyu Pan,Zhou Jiang,Tingting Qin,Dong Wang,Fuxi Liu,He Yang,Qing Liang,Wei Zhang,Weitao Zheng

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引用次数: 0

Abstract

Manganese-based oxide can theoretically exert the multivalent advantages of an aqueous magnesium-ion cathode due to its redox activity, and abundant crystal structure. However, sluggish diffusion kinetics of Mg2+ and Mn dissolution limit the rate performance and structure stability. Herein, we successfully utilize the notorious dissolution of Mn(II) tetrahedral site contributed vacancies for packaging optimum Mg2+ storage of a popular spinel Mn3O4 electrode. Such mechanism reverses the sluggish diffusion kinetics. Moreover, merited by the common ion effect and drug dissolution, a suitable pre-addition of Mn2+ to electrolyte inhibit Mn(III) dissolution and optimize the integrity of the spinel framework. Impressively, the cathode achieves a reversible capacity of 310 mAh g-1 and a stable cycle performance of 2000 cycles with 94.9% retention. Our research shows that reversible insertion/extraction at vacancies and effective stabilization of spinel framework is a powerful strategy to achieve Mg2+ ion energy storage system with high rate performance and long lifespan.

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利用Mn（II）溶解诱导空位优化尖晶石Mn3O4的Mg2+储存。

锰基氧化物由于其氧化还原活性和丰富的晶体结构，理论上可以发挥镁离子水溶液阴极的多价优势。然而，缓慢的Mg2+扩散动力学和Mn溶解限制了速率性能和结构稳定性。在此，我们成功地利用了众所周知的Mn（II）四面体的溶解位点贡献的空位来封装一种流行的尖晶石Mn3O4电极的最佳Mg2+存储。这种机制逆转了缓慢的扩散动力学。此外，利用共离子效应和药物溶出性，在电解质中预先添加适量的Mn2+可以抑制Mn（III）的溶出，优化尖晶石骨架的完整性。令人印象深刻的是，阴极实现了310 mAh g-1的可逆容量和2000次循环的稳定循环性能，保留率为94.9%。我们的研究表明，可逆的空位插入/提取和尖晶石框架的有效稳定是实现Mg2+离子储能系统高速率性能和长寿命的有效策略。

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

Angewandte Chemie International Edition 化学-化学综合

CiteScore

26.60

自引率

6.60%

发文量

3549

审稿时长

1.5 months

期刊介绍： Angewandte Chemie, a journal of the German Chemical Society (GDCh), maintains a leading position among scholarly journals in general chemistry with an impressive Impact Factor of 16.6 (2022 Journal Citation Reports, Clarivate, 2023). Published weekly in a reader-friendly format, it features new articles almost every day. Established in 1887, Angewandte Chemie is a prominent chemistry journal, offering a dynamic blend of Review-type articles, Highlights, Communications, and Research Articles on a weekly basis, making it unique in the field.