Solvent Engineering Enabled Fast Long-Range Ion Transport in Mn/Fe-Based Prussian Blue Analogues for High-Loading-Mass Zn-Ion Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 42429444.
- Also identified by DOI 10.1002/adma.74022.
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Abstract
Prussian blue analogues (PBAs) are promising cathode materials for Zn-ion batteries (ZIBs) due to their open framework and high operating voltage. However, the blocked long-range ion transport caused by structural collapse during the repeated ion intercalation/deintercalation at high loading mass remains a critical issue to address in practical applications. Here, we propose the promotion of long-range ion transport in model cathode of Mn/Fe-based PBAs by solvent intercalation, which expands the ion channel and regulates the coordination number of Fe active center. This suppresses the lattice oscillation related to the evolution between Fe<sup>2+</sup>-C≡N-M<sup>2+</sup> and Fe<sup>3+</sup>-C≡N-M<sup>3+</sup> and decreases the ion long-range transport barrier under high loading mass. Consequently, it achieves a capacity enhancement of 185% at 9 mg cm<sup>-2</sup> and good cycling stability at 18 mg cm<sup>-2</sup>, surpassing other reported PBAs cathodes in ZIBs. This study provides a new direction for addressing the high-loading-mass challenge of PBAs cathode for ZIBs.