Amorphization Engineering: A Complementary Strategy to Mitigate Intrinsic Limitations of Mainstream Crystalline Cathodes for Aqueous Zinc‐Ion Batteries

ABSTRACT The global transition to clean renewable energy urgently demands high‐safety, high‐energy‐density electrochemical energy storage systems. Aqueous zinc‐ion batteries (AZIBs) are highly promising for large‐scale stationary storage, but their commercialization is severely blocked by inherent flaws of mainstream crystalline cathodes: sluggish Zn 2+ transport, irreversible structural collapse, transition metal dissolution, and detrimental interfacial side reactions. Amorphization engineering of crystalline cathodes provides a targeted solution to these bottlenecks, as they can directly regulate ion transport kinetics, improve cathode structural stability, suppress interfacial by‐product formation, and increase electrochemically active sites. However, existing studies lack a systematic, comprehensive review of the multi‐functional mechanisms of amorphization engineering of crystalline cathodes in AZIBs. This review elaborates AZIBs energy storage and failure mechanisms, summarizes inherent advantages and controllable synthesis strategies of the amorphization strategy for the crystalline cathode, and dissects their core working mechanisms, including inhibiting metal ion dissolution, preventing the collapse of the cathode structure, alleviating the strong electrostatic interaction of cathode, increasing the ionic conductivity, reducing the ion diffusion energy barrier, enhancing the ion diffusion path, and increasing the active sites. Finally, we propose key challenges of amorphized cathodes and future directions, providing actionable design guidelines for high‐performance AZIBs.