High-Performance Aqueous Ammonium-ion Batteries Utilizing a Novel Energy Storage Technology Based on Copper-Manganese Hexacyanoferrate

The strong global demand for efficient, safe, and cost-effective energy storage solutions has driven the rapid development of aqueous electrochemical energy storage systems. In this field, aqueous ammonium-ion batteries (AAIBs) are regarded as a highly promising next-generation energy storage technology due to their environmental friendliness, high safety, and low-cost advantages. As a key component, Prussian blue analogues (PBAs) have emerged as an ideal cathode material choice for AAIBs, owing to their unique open-framework structure and excellent compatibility with $NH_{4}^+$ ions. However, their practical applications are limited by insufficient capacity and short cycle life. To address these issues, this study developed high-performance PBA cathode materials through directed structural regulation. Copper manganese hexacyanoferrate (CuMnHCF) was prepared using a facile co-precipitation method. The material demonstrates outstanding electrochemical characteristics, showcasing a remarkable specific capacity of 180 mAh\ g−1and impressive rate capability, considerably surpassing traditional PBA materials. Additionally, it has shown remarkable cycling stability, maintaining 71.95% of its original capacity following 2400 cycles, representing a significant enhancement compared to current PBA cathodes for AAIBs. This research focuses on the creation of high-performance PBAs cathodes, which enhance the electrochemical efficiency of AAIBs and promote the innovation of new aqueous battery energy storage technologies, an essential move for addressing global energy storage needs.