Abstract
Vanadyl sulfate (VOSO4) Li-free cathode material was applied to lithium batteries due to the strong inductive effect of polyanions SO42− and vanadium-based materials exhibit excellent electrochemical activity, but their research was hindered by its extremely moisture sensitive and poor intrinsic electronic conductivities. To overcome these difficulties, we successfully synthesized carbon-coated beta-VOSO4 (β-VOSO4@C) in one-pot synthesis method with a versatile oxalic acid as the reducing agent, carbon source and chelators, which greatly simplified the preparation process and the C layer holds back the moisture. The influence of the oxalic acid content on the microstructure and electrochemical properties of VOSO4 was studied systematically. Our studies showed that VOSO4 prepared by adding 1.3 g of oxalic acid monohydrate (VOSO@C-2) has the best performance, the amorphous carbon layer coating with a thickness of approximately 5 nm, typically reduces the electrode polarization and improves electronic conductivity. Furthermore, VOSO@C-2 delivers a maximum first discharge capacity of 163.7 mA h/g at 0.05C and a capacity retention of 70% after 110 cycles at 0.1C; furthermore, the Coulombic efficiency was retained at approximately 100%.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
