Exploration of Pyrochlore-Bi2Sn2O7 as an Anode for Potassium-Ion Batteries

Pyrochlore type-Bi2Sn2O7/carbon composite (BSO/C), prepared via ball milling, is explored as a potential K-ion anode. It delivers reversible capacities of greater than 295 mAh g–1 for 100 cycles at 50 mA g–1 in 5 M KFSI in EC/DEC electrolyte, while a severe capacity fade is noticed in a KPF6-based electrolyte system. A full K-ion battery comprising K4Fe(CN)6 and BSO/C as the cathode and the anode respectively, is also demonstrated.