Sodium-ion batteries (SIBs) have emerged as promising candidates for electrical energy storage due to their abundant resources, low cost, and high safety. Among various cathode materials for SIBs, Mn-based Prussian blue analogues (Mn-PBAs) have attracted significant attention owing to its high Mn 2+ /Mn 3+ redox potential and open framework that enables fast Na-ion transport. However, practical application of Mn-PBA cathode is limited by challenges such as Jahn-Teller-induced structural instability, manganese ion dissolution, and interstitial-water-triggered parasitic reactions, all of which lead to rapid capacity fading and poor cycling stability. This review begins with an overview of the crystal structure, sodium storage mechanism, and key degradation pathways of Mn-PBA cathodes, followed by a summary of major strategies for performance improvement, including surface coating, bulk-phase doping, and electrolyte engineering. Finally, future directions for the rational design of high-performance Mn-PBA cathodes are discussed, along with their potential applications in electrical energy storage.
Li et al. (Fri,) studied this question.
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