▎ 摘　　要

Here, a low-defect K2Mn[Fe(CN)(6)]-reduced graphene oxide (KMF-RGO) composite is fabricated, which demonstrates excellent cycling stability, fast rate capability, and exceptional air stability as a cathode material for potassium-ion batteries (KIBs). This work provides a practical strategy for the synthesis of high-performance K2Mn[Fe(CN)(6)] cathode materials for KIBs.