PH-regulative synthesis of Na3(VPO4)2F3 nanoflowers and their improved Na cycling stability. Issue 19 (22nd April 2016)

• Record Type: Journal Article
• Authors: Qi, Yuruo; Mu, Linqin; Zhao, Junmei; Hu, Yong-Sheng; Liu, Huizhou; Dai, Sheng
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 19(2016)
• Page Start: 7178
• Page End: 7184
• Publication Date: 2016-04-22
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta01023g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Na-ion batteries are becoming increasingly attractive as a low cost energy storage device. Abstract : Na-ion batteries are becoming increasingly attractive as a low cost energy storage device. Sodium vanadium fluorophosphates have been studied extensively recently due to their high storage capacity and high discharge voltage. Shape and size often have a crucial influence over the properties. The controlling synthesis of nanoparticles with special microstructures is significant, which becomes a challenging issue and has drawn considerable attention. In this study, Na3 (VPO4 )2 F3 nanoflowers have been synthesized via a pH-regulative low-temperature (120 °C) hydro-thermal route. In particular, it is a green route without any organic compounds involved. The hydro-thermal reaction time for the formation of Na3 (VPO4 )2 F3 nanoflowers has also been investigated. A weak acid environment (pH = 2.60) with the possible presence of hydrogen fluoride molecules is necessary for the formation of the desired nanoflower microstructures. Compared to the nanoparticles obtained by Na2 HPO4 ·12H2 O, the as-synthesized Na3 (VPO4 )2 F3 nanoflowers showed an excellent Na-storage performance in terms of superior cycle stability, even without any further carbon coating or high-temperature treatment.