Hydrated Bi‐Ti‐Bimetal Ethylene Glycol: A New High‐Capacity and Stable Anode Material for Potassium‐Ion Batteries

Abstract Potassium‐ion batteries have emerged not only as low‐cost alternatives to lithium‐ion batteries, but also high‐voltage energy storage systems. However, their development is still encumbered by the scarcity of high‐performance electrode materials that can endure successive potassium‐ion uptake. Herein, a hydrated Bi‐Ti bimetallic ethylene glycol (H‐Bi‐Ti‐EG) compound reported new high‐capacity and stable anode material for potassium storage. H‐Bi‐Ti‐EG possesses long‐range disordered layered framework, which helps facilitate electrolyte ingress into entire Bi nanoparticles. A suite spectroscopic analyses reveals in situ formation nanoparticles within organic polymer matrix, alleviate stresses caused huge volume expansion/contraction during deep cycles, thereby maintaining superior structural integrity anode. As expected, exhibits high capacity long‐term cycling stability. Importantly storage, it be cycled at current densities 0.1, 0.5, 1, 2 Ag −1 800, 700, 1000, even 6000 retaining charging capacities 361, 206, 185, 85.8 mAh g , respectively. The scalable synthetic method along with outstanding electrochemical performance Bi‐Ti‐EG, other Bi‐based materials, places promising