Reaction Environment-Tailored Synthesis of High-Quality Prussian Blue Analogues for Ultra-Stable Potassium Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 40947641.
- Also identified by DOI 10.1021/acs.nanolett.5c03890.
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Abstract
Fe-based Prussian blue analogues (PB: K<sub>2</sub>Fe[Fe(CN)<sub>6</sub>]) have been considered as highly competitive cathode materials for potassium-ion batteries due to their open framework and abundant redox active centers. However, the electrochemical performance of the PB cathode is deteriorated by unavoidable introduction of [Fe(CN)<sub>6</sub>]<sup>4-</sup> vacancies and crystal water. This work tailors the synthesis reaction environment, enabling precise control over reactant dissolution kinetics to minimize the level of structural V<sub>FeCN</sub> and crystal water. The as-prepared PB cathode achieves unprecedented cycling stability: 2500 cycles (running over one year) at 50 mA g<sup>-1</sup> and 20,000 cycles at 500 mA g<sup>-1</sup>, respectively. <i>In situ</i> characterizations reveal that reduced vacancies are conducive to activating the electrochemical activity of the low spin Fe redox centers and ensuring structural stability during long-term cycling. Furthermore, the mother liquor allows for multiple recycling without functional degradation via quantitatively calibrating its concentration, endowing this strategy with significant potential for practical application.