Title: Electrospun Vanadium-based Oxides as Positive Electrode Materials for Lithium Ion Batteries
Electrospun ceramic oxide nanofibers find numerous uses as energy materials such as in thermoelectrics and battery electrodes. Electrospinning is a simple and versatile technique that is capable of forming fibrous nanostructured oxides. Vanadium oxide is a viable electrode material for energy storage devices, such as lithium ion batteries, with tuneable oxidation states and a layered structure that can reversibly intercalate lithium ion charge carriers. The use of vanadium pentoxide in energy storage devices is limited by its low structural stability and slow electrochemical kinetics associated with lithium ion intercalation and extraction resulting in poor cycle stability. Dopants are used to improve the electrochemical performance and to increase cycle stability. In particular, redox-inactive dopants, those of which provide no additional redox transfer reactions upon lithium ion intercalation and extraction, have previously been shown to improve cycling stability and electrochemical performance of the host active material.
In this presentation, the results from a series of investigations exploring the energy storage capabilities of electrospun vanadium-based oxides for lithium ion batteries will be discussed with emphasis on the role dopants play as intentionally introduced defects both structurally and electrochemically in the host material. This project was a collaborative effort between the Energy Nanomaterials Group in the Research School of Engineering, ANU, and the Institute of Materials Research and Engineering, Singapore.