A Comprehensive Evaluation of Battery Technologies for High–Energy Aqueous Batteries

Abstract Aqueous batteries have garnered significant attention in recent years as a viable alternative to lithium‐ion batteries for energy storage, owing to their inherent safety, cost‐effectiveness, and environmental sustainability. This study offers a comprehensive review of recent advancements, persistent challenges, and the prospects of aqueous batteries, with a primary focus on energy density compensation of various battery engineering technologies. Additionally, cutting‐edge high‐energy aqueous battery designs are emphasized as a reference for future endeavors in the pursuit of high‐energy storage solutions. Finally, a dual‐compatibility battery configuration perspective aimed at concurrently optimizing cycle stability, redox potential, capacity utilization for both anode and cathode materials, as well as the selection of potential electrode candidates, is proposed with the ultimate goal of achieving cell‐level energy densities exceeding 400 Wh kg –1 .