Eco-friendly synthesis of VO2 with stripped pentavalent vanadium solution extracted from vanadium-bearing shale by hydrothermal process in high conversion rate.

ABSTRACT: VO2(B) has shown excellent cathode performance in lithium batteries and become a hot research topic in recent years. A stripped vanadium solution extracted from vanadium-bearing shale containing a high concentration of vanadium and certain amounts of impurities was used as a vanadium source to synthesize VO2(B) by hydrothermal process. The VO2 conversion rate can reach as high as 99.47% in a reaction time of 8 h, and this is the highest result reported. The crystalline structure and morphology of the synthesized products were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). Furthermore, the electrochemical properties of VO2(B) in lithium-ion batteries were investigated. The results indicated that the VO2(B) has the initial specific discharge capacity of 192.0 mAh g-1. Stripped vanadium solution is a raw material for producing V2O5 and NH4VO3, which are indispensable vanadium sources in VO2 synthesis. Therefore, synthesis of VO2 via hydrothermal reduction by oxalic acid using stripped vanadium solution extracted from vanadium-bearing shale as a direct vanadium source is an eco-friendly, innovative and efficient method, and will have a great impact on VO2 synthesis.

SUBMITTER: Kang Q 

PROVIDER: S-EPMC6408403 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature