Low-Temperature Synthesis of AMoO4 (A = Ca, Sr, Ba) Scheelite Nanocrystals

摘要

An extension of the vapor diffusion sol—gel method to the synthesis of the AMoO4 (A = Ca, Sr, Ba) scheelite family of materials is reported. Sub-30 nm quasispherical nanocrystals were obtained after vapor diffusion at room temperature, followed by thermal aging at 80 °C. Rietveld analysis of X-ray diffraction data, Raman spectroscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy demonstrated that the vapor diffusion sol—gel method affords crystalline and phase-pure AMoO4 nanocrystals with excellent compositional control. The potential lithium storage capacity of the CaMoO4 nanocrystals versus Li at a rate of C/4 was also investigated. The nanocrystals exhibited an extremely large first discharge capacity of 1300 mA h g~(-1), which stabilized at 250 mA h g~(-1) after 25 cycles.