Work

Synergistic Kinetics Modulation at Graphite Interface Enables Ultrafast and Durable Potassium‐Ion Batteries

Year: 2025

Type: article

Abstract: Graphite has been considered as the most promising anode material for potassium‐ion batteries (PIBs) commercialization due to its high theoretical specific capacity and favorable charge‐discharge platform. Nevertheless, in conventional KPF 6 ‐based electrolytes, the practical implementation is hindered by sluggish potassium‐ion (K + ) transport through solid electrolyte interphase (SEI), leading to poor rate capability and inferior cycling durability. A nanostructured SiO 2 modification layer is constructed on a graphite surface (SiO 2 ‐Graphite) to regulate the interfacial kinetics, which can enable a faster K + diffusion capability and lower K + migration barrier. Notably, the SiO 2 ‐Graphite anode exhibits high initial Coulombic efficiency (84.1%), excellent cycling stability (400 cycles with a capacity retention of 71%), and high‐rate capability (213 mAh g −1 at a high current density of 500 mA g −1 ) in conventional KPF 6 ‐based electrolyte. In addition, the PB||SiO 2 ‐Graphite full cell also demonstrates good cycling stability (90% capacity retention after 600 cycles) and excellent rate performance (high specific capacity at a current density of 2000 mA g −1 ), which outperforms that of most previously reported PIBs systems. This interfacial kinetics regulation strategy provides new insights into improving the cycling stability and rate capability of electrodes.

Source: Advanced Functional Materials

DOI: 10.1002/adfm.202504576