This article presents a novel alkaline aqueous sodium-ion battery (ASIB) with a Mn-based Prussian blue analogue (NMF) cathode, NaTi2(PO4)3 (NTP) anode, and an affordable, fluorine-free sodium perchlorate (NaClO4) electrolyte. The battery exhibits a lifespan of 13,000 cycles at 10 C and a high energy density of 88.9 Wh kg\(^{-1}\) at 0.5 C. The key innovation involves the use of a nickel/carbon (Ni/C) layer to create a H\(_3\)O\(^+\)-rich local environment near the cathode surface, which suppresses oxygen evolution and enhances durability. Additionally, Ni atoms are in-situ embedded into the cathode to stabilize the NMF structure in alkaline media. This approach not only suppresses hydrogen evolution but also initiates oxygen evolution and cathode dissolution, leading to improved performance and stability. The battery demonstrates excellent safety, cost-effectiveness, and environmental benignity, making it a promising candidate for large-scale energy storage applications.This article presents a novel alkaline aqueous sodium-ion battery (ASIB) with a Mn-based Prussian blue analogue (NMF) cathode, NaTi2(PO4)3 (NTP) anode, and an affordable, fluorine-free sodium perchlorate (NaClO4) electrolyte. The battery exhibits a lifespan of 13,000 cycles at 10 C and a high energy density of 88.9 Wh kg\(^{-1}\) at 0.5 C. The key innovation involves the use of a nickel/carbon (Ni/C) layer to create a H\(_3\)O\(^+\)-rich local environment near the cathode surface, which suppresses oxygen evolution and enhances durability. Additionally, Ni atoms are in-situ embedded into the cathode to stabilize the NMF structure in alkaline media. This approach not only suppresses hydrogen evolution but also initiates oxygen evolution and cathode dissolution, leading to improved performance and stability. The battery demonstrates excellent safety, cost-effectiveness, and environmental benignity, making it a promising candidate for large-scale energy storage applications.