Among various polyphosphate compounds,iron-based mixed phosphate cathode material Na4Fe3(PO4)2P2O7 (NFPP) has garnered significant attention in the realm of aqueous zinc-ion batteries due to its remarkable specific capacity and outstanding stability.In this study,NFPP@C was synthesized using a secondary ball-milling solid-phase reaction method.We investigated the impact of raw material ratios on the electrochemical performance of aqueous zinc-ion batteries (AZIBs) by varying the proportions of sodium source NaH2PO4·2H2O and iron source FeC2O4·2H2O.The results indicated that when the ratio of sodium to iron sources was 4.5∶3.5—yielding NFPP-4.5,the initial discharge specific capacity at a rate of 0.2C reached 104.3mAh/g.Under high-rate discharge conditions at 5C,it maintained a reversible capacity of 65.6mAh/g.Furthermore,after 100 cycles at a rate of 0.2C,it exhibited an impressive capacity retention rate of up to 94.1%,demonstrating exceptional electrochemical performance.
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基金资助
国家自然科学基金(51574081)
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