{"title":"Structural Transformation by Crystal Engineering Endows Aqueous Zinc-Ion Batteries with Ultra-long Cyclability","authors":"Kangning Wang, Jianwei Wang, Peiming Chen, Mengran Qin, Chunming Yang, Wenlin Zhang, Zhuangzhuang Zhang, Yanzhong Zhen, Feng Fu, Bin Xu","doi":"10.1002/smll.202300585","DOIUrl":null,"url":null,"abstract":"<p>Manganese oxide is a promising cathode material for aqueous zinc batteries. However, its weak structural stability, low electrical conductivity, and sluggish reaction kinetics lead to rapid capacity fading. Herein, a crystal engineering strategy is proposed to construct a novel MnO<sub>2</sub> cathode material. Both experimental results and theoretical calculations demonstrate that Al-doping plays a crucial role in phase transition and doping-superlattice structure construction, which stabilizes the structure of MnO<sub>2</sub> cathode materials, improves conductivity, and accelerates ion diffusion dynamics. As a result, 1.98% Al-doping MnO<sub>2</sub> (AlMO) cathode shows an incredible 15 000 cycle stability with a low capacity decay rate of 0.0014% per cycle at 4 A g<sup>−1</sup>. Additionally, it provides superior specific capacity of 311.2 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup> and excellent rate performance (145.2 mAh g<sup>−1</sup> at 5.0 A g<sup>−1</sup>). To illustrate the potential of 1.98%AlMO to be applied in actual practice, flexible energy storage devices are fabricated and measured. These discoveries provide a new insight for structural transformation via crystal engineering, as well as a new avenue for the rational design of electrode material in other battery systems.</p>","PeriodicalId":228,"journal":{"name":"Small","volume":"19 29","pages":""},"PeriodicalIF":13.0000,"publicationDate":"2023-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Small","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/smll.202300585","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 7
Abstract
Manganese oxide is a promising cathode material for aqueous zinc batteries. However, its weak structural stability, low electrical conductivity, and sluggish reaction kinetics lead to rapid capacity fading. Herein, a crystal engineering strategy is proposed to construct a novel MnO2 cathode material. Both experimental results and theoretical calculations demonstrate that Al-doping plays a crucial role in phase transition and doping-superlattice structure construction, which stabilizes the structure of MnO2 cathode materials, improves conductivity, and accelerates ion diffusion dynamics. As a result, 1.98% Al-doping MnO2 (AlMO) cathode shows an incredible 15 000 cycle stability with a low capacity decay rate of 0.0014% per cycle at 4 A g−1. Additionally, it provides superior specific capacity of 311.2 mAh g−1 at 0.1 A g−1 and excellent rate performance (145.2 mAh g−1 at 5.0 A g−1). To illustrate the potential of 1.98%AlMO to be applied in actual practice, flexible energy storage devices are fabricated and measured. These discoveries provide a new insight for structural transformation via crystal engineering, as well as a new avenue for the rational design of electrode material in other battery systems.
氧化锰是一种很有前途的水性锌电池正极材料。然而,它的结构稳定性弱,电导率低,反应动力学缓慢,导致容量褪色快。本文提出了一种晶体工程策略来构建一种新型二氧化锰正极材料。实验结果和理论计算均表明,al掺杂对MnO2正极材料的相变和掺杂-超晶格结构的构建起着至关重要的作用,它稳定了MnO2正极材料的结构,提高了电导率,加速了离子扩散动力学。结果表明,1.98% al掺杂的MnO2 (AlMO)阴极在4a g−1下具有令人难以置信的15000次循环稳定性和0.0014%的低容量衰减率。此外,它提供了优越的比容量311.2 mAh g−1在0.1 A g−1和卓越的倍率性能(145.2 mAh g−1在5.0 A g−1)。为了说明1.98%AlMO在实际应用中的潜力,制作并测量了柔性储能装置。这些发现为通过晶体工程进行结构转化提供了新的见解,也为其他电池系统中电极材料的合理设计提供了新的途径。
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology.
Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.