Synergistic Multi‐Scale Confinement Engineering Stabilizes Organic Anode for High‐Performance Potassium‐Ion Batteries

Organic small molecules are promising high‐capacity anodes for potassium‐ion batteries (PIBs), but their practical application is severely hampered by active material dissolution, persistent parasitic reactions at the solid‐electrolyte interface, and sluggish reaction kinetics, resulting in rapid capacity decay. To holistically address these multifaceted drawbacks, this work demonstrates a synergistic multi‐scale confinement engineering strategy through coordinated design at the molecule‐ion‐electron levels. Specifically, active molecules are physically confined within the ordered mesopores of conductive CMK3 carbon, ensuring structural stability and efficient electron transport. Concurrently, a high concentration electrolyte (3 m KFSI in EC/DEC) is employed to tailor the solvation environment, regulating anion activity, and stabilize the interface. At the molecular scale, an electron‐withdrawing fluorine substituent is used to optimize electronic structure, enhancing potassium storage kinetics and capacity. The resulting 2FBA@CMK3 anode delivers an impressive reversible capacity of 152 mAh/g after 400 cycles at 500 mA/g, outperforming most reported organic PIB anodes. This work establishes a holistic and rational design paradigm for advancing organic electrode materials toward high‐performance PIBs.