Conquering Aluminum Anode Degradation: Comprehensive Strategies Rooted in Dendrite/Hydrogen Evolution Mechanistic Insights for Aluminum Batteries

Abstract The burgeoning field of rechargeable aluminum batteries (RABs), featuring an aluminum metal anode, represents a cutting‐edge frontier in next‐generation green energy storage research, promising cost‐effectiveness, robustness, and high energy density. However, the advancement of aluminum anode is impeded by challenges, such as dendrite growth, hydrogen evolution, corrosion, and passivation. Recent endeavors have focused on overcoming these obstacles through innovative electrode structure design, interface modifications and optimization of electrolytes. RABs are classified into two categories: nonaqueous and aqueous systems, which largely differ from the chemical and electrochemical perspectives. A comprehensive and methodical compilation of strategies aimed at addressing the challenges facing RABs remains scarce. To bridge this gap, this review offers an in‐depth exploration of aluminum anode stabilization strategies in both aqueous and nonaqueous electrolytes. It is begun by delineating the foundational understanding of aluminum metal anodes. Following this, it is meticulously classified, discussed, and analyzed methods to suppress dendrite formation and hydrogen evolution reactions. Finally, the ongoing challenges are summarized and guidelines for future research are provided to expedite the development and practical application of RABs.