Local structure and ion storage properties of vanadate cathode materials regulated by the pre-alkalization. Issue 38 (7th September 2022)

• Record Type: Journal Article
• Authors: Shan, Xiaoqiang; Kim, SaeWon; Abeykoon, Milinda; Kwon, Gihan; Olds, Daniel; Teng, Xiaowei
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 38(2022)
• Page Start: 20552
• Page End: 20558
• Publication Date: 2022-09-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta04490k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Alkali metal-ions (A: Li, Na, K) regulate the local structure and long-range order of nanostructured vanadate materials for improved electrochemical performance in zinc-ion batteries. Abstract : Aqueous Zn-ion batteries using mild acidic electrolytes utilizing a Zn 2+ /H + dual-ion storage mechanism have shown great potential in achieving high energy density comparable to non-aqueous lithium-ion batteries. This study reveals that hydrated alkali-ions regulate the formation of alkali-intercalated vanadate layered compounds. Among various vanadate materials, lithium-intercalated vanadate has the largest interlayer spacing and most disordered local structure, exhibiting the largest storage capacity of 308 mA h g −1 at 0.05 A g −1 for Zn 2+ /H + dual-ion storage and improved charge transfer and transport kinetics and cycling performance, evidenced by in situ X-ray diffraction and ex situ X-ray total scattering and pair distribution function analysis. Our study provides new insight into designing layered vanadate materials for high-capacity aqueous batteries.