Ashok Kumar Kakarla, Hari Bandi, Wasim Akram Syed, R. Shanthappa, Jae Su Yu
{"title":"Structural engineering of potassium vanadate cathode by pre-intercalated Mg2+ for high-performance and durable rechargeable aqueous zinc-ion batteries","authors":"Ashok Kumar Kakarla, Hari Bandi, Wasim Akram Syed, R. Shanthappa, Jae Su Yu","doi":"10.1016/j.jma.2024.08.018","DOIUrl":null,"url":null,"abstract":"<div><div>Aqueous zinc (Zn)-ion batteries (AZIBs) have the potential to be used in massive energy storage owing to their low cost, eco-friendliness, safety, and good energy density. Significant research has been focused on enhancing the performance of AZIBs, but challenges persist. Vanadium-based oxides, known for their large interlayer spacing, are promising cathode materials. In this report, we synthesize Mg<sup>2+</sup>-intercalated potassium vanadate (KVO) (MgKVO) via a single-step hydrothermal method and achieve a 12.2 Å interlayer spacing. Mg<sup>2+</sup> intercalation enhances the KVO performance, providing wide channels for Zn<sup>2+</sup>, which results in high capacity and ion diffusion. The combined action of K<sup>+</sup> and Mg<sup>2+</sup> intercalation enhances the electrical conductivity of MgKVO. This structural design endows MgKVO with excellent electrochemical performance. The AZIB with the MgKVO cathode delivers a high capacity of 457 mAh g<sup>-1</sup> at 0.5 A g<sup>-1</sup>, excellent rate performance of 298 mAh g<sup>-1</sup> at 5 A g<sup>-1</sup>, and outstanding cycling stability of 102% over 1300 cycles at 3 A g<sup>-1</sup>. Additionally, pseudocapacitance analysis reveals the high capacitance contribution and Zn<sup>2+</sup> diffusion coefficient of MgKVO. Notably, ex-situ X-ray diffraction, X-ray photoelectron spectroscopy, and Raman analyses further demonstrate the Zn<sup>2+</sup> insertion/extraction and Zn-ion storage mechanisms that occurred during cycling in the battery system. This study provides new insights into the intercalation of dual cations in vanadium oxides and offers new solutions for designing cathodes for high-capacity AZIBs.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"12 9","pages":"Pages 3780-3793"},"PeriodicalIF":15.8000,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnesium and Alloys","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2213956724003074","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Aqueous zinc (Zn)-ion batteries (AZIBs) have the potential to be used in massive energy storage owing to their low cost, eco-friendliness, safety, and good energy density. Significant research has been focused on enhancing the performance of AZIBs, but challenges persist. Vanadium-based oxides, known for their large interlayer spacing, are promising cathode materials. In this report, we synthesize Mg2+-intercalated potassium vanadate (KVO) (MgKVO) via a single-step hydrothermal method and achieve a 12.2 Å interlayer spacing. Mg2+ intercalation enhances the KVO performance, providing wide channels for Zn2+, which results in high capacity and ion diffusion. The combined action of K+ and Mg2+ intercalation enhances the electrical conductivity of MgKVO. This structural design endows MgKVO with excellent electrochemical performance. The AZIB with the MgKVO cathode delivers a high capacity of 457 mAh g-1 at 0.5 A g-1, excellent rate performance of 298 mAh g-1 at 5 A g-1, and outstanding cycling stability of 102% over 1300 cycles at 3 A g-1. Additionally, pseudocapacitance analysis reveals the high capacitance contribution and Zn2+ diffusion coefficient of MgKVO. Notably, ex-situ X-ray diffraction, X-ray photoelectron spectroscopy, and Raman analyses further demonstrate the Zn2+ insertion/extraction and Zn-ion storage mechanisms that occurred during cycling in the battery system. This study provides new insights into the intercalation of dual cations in vanadium oxides and offers new solutions for designing cathodes for high-capacity AZIBs.
期刊介绍:
The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.