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Solvent Engineering Enabled Fast Long-Range Ion Transport in Mn/Fe-Based Prussian Blue Analogues for
Na Jiang1, Ziyang Dai1, Qi Yang1
1State Key Laboratory of Chemical Resource Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China.
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 Fe2+-C≡N-M2+ and Fe3+-C≡N-M3+ and decreases the ion long-range transport barrier under high loading mass. Consequently, it achieves a capacity enhancement of 185% at 9 mg cm-2 and good cycling stability at 18 mg cm-2, 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.
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