A High‐Stability Zinc Powder Anode Built on the Similarity Compatibility Principle

Abstract The high thermodynamic activity of zinc powder anodes leads to severe side reactions and hydrogen evolution in aqueous zinc‐ion batteries, which hinders their practical application. This study presents a novel strategy for constructing highly stable zinc powder anodes based on the “similarity‐compatible” design principle. By exploiting the morphological and structural similarity between flake‐type zinc powder and flake graphite, a zinc‐carbon anode (ZP@FG) with excellent interfacial compatibility is developed, leading to significantly enhanced electrochemical stability. Electrochemical analyses and simulations demonstrate that ZP@FG provides a stable interface, reduces parasitic side reactions, suppresses dendrite formation, and ensures uniform zinc deposition by effectively modulating the local electric field distribution. Notably, symmetric cells employing ZP@FG electrodes achieved exceptionally prolonged cycling lifetimes exceeding 790 h at 1 mA cm −2 . Full cells coupled with a V₂O₅ cathode exhibited outstanding capacity retention, maintaining over 130 mAh g −1 after 2400 cycles at 7 A g −1 . Moreover, pouch‐type cells using high‐mass‐loading electrodes (18 mg cm −2 ) operated steadily for over 330 cycles, delivering a cumulative capacity of 25.3 Ah, highlighting significant potential for practical implementation. This work provides crucial insights and a scalable approach toward high‐performance, long‐lifespan zinc anodes suitable for commercialization.