Dimensional Engineering‐Driven V/O Defect Modulation for Ultrahigh‐Energy‐Density Aqueous Zinc‐Ion Batteries

, along with excellent cycling stability-retaining 87.9% of its capacity over 2000 cycles. Moreover, the material exhibits promising performance in aqueous magnesium-ion batteries, demonstrating remarkable versatility. This work offers a compelling design paradigm for in situ structure and defect engineering toward high-performance cathode materials for aqueous multivalent-ion batteries.