|About this Abstract
||MS&T22: Materials Science & Technology
||Energy Materials for Sustainable Development
||Electrochemical Properties of a Titanium-Substituted KVPO4F Cathode for K-Ion Batteries
||Xiaoran Yang, Jae Chul Kim
|On-Site Speaker (Planned)
A battery system made of electrodes that intercalate potassium (K) ions as a charge carrier can be one of the promising large-scale energy storage platforms for grid. To design the K-ion cathodes, materials with open and rigid frameworks are considered desirable due to the large ionic radius of K. Especially, the polyanionic framework of KVPO4F has the potential to store K effectively. However, its rate capability and cyclability are unsatisfactory to develop practical K-ion batteries. In this presentation, we will demonstrate the effect of partial titanium (Ti) substitution for vanadium (V) on the electrochemical properties of KVPO4F. We found that kinetics and reversibility of K intercalation and the associated physicochemical properties of Ti-substituted KVPO4F are strongly coupled with local coordination of K. Our results suggest that Ti substitution can be an effective approach to design K-ion cathode materials.