Limin Deng, Yue Zhang, Yakun Tang, Yuandong Li, Wenjie Ma, Lang Liu, Sen Dong, Yuliang Cao
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Herein, the study constructs a dual‐conductive structure that the Na<jats:sub>2.31</jats:sub>Fe<jats:sub>1.72</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> particles with amorphous carbon in situ‐coated embedded in ketjen black (KB) conducting carbon networks (NFS/KB) via a solid phase ball‐milling strategy, which effectively enhanced inherent conductivity and electron transfer efficiency among particles of the Fe‐based sulphate. The NFS/KB can provide a reversible capacity of 92 mAh g<jats:sup>−1</jats:sup> at 0.1 C and stable cycling stability at high current (85% retention after 500 cycles at 20 C) as cathode of SIBs. Surprisingly, as anode of SIBs, the NFS/KB delivers a rate performance (149 mAh g<jats:sup>−1</jats:sup> at 10 C) that is superior to that of hard carbon. Notably, further application of the material to symmetric SIBs also achieves favorable results. 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However, the poor conductivity and the tendency to agglomerate have limited their further application. Herein, the study constructs a dual‐conductive structure that the Na<jats:sub>2.31</jats:sub>Fe<jats:sub>1.72</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>3</jats:sub> particles with amorphous carbon in situ‐coated embedded in ketjen black (KB) conducting carbon networks (NFS/KB) via a solid phase ball‐milling strategy, which effectively enhanced inherent conductivity and electron transfer efficiency among particles of the Fe‐based sulphate. The NFS/KB can provide a reversible capacity of 92 mAh g<jats:sup>−1</jats:sup> at 0.1 C and stable cycling stability at high current (85% retention after 500 cycles at 20 C) as cathode of SIBs. Surprisingly, as anode of SIBs, the NFS/KB delivers a rate performance (149 mAh g<jats:sup>−1</jats:sup> at 10 C) that is superior to that of hard carbon. Notably, further application of the material to symmetric SIBs also achieves favorable results. 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引用次数: 0
摘要
基于 Fe0/Fe2+/Fe3+ 氧化还原特性,硫酸铁基材料在钠离子电池(SIB)阴极中的应用前景与硬碳相当,而且成本低、工作电压高,因此备受关注。然而,导电性差和容易团聚的缺点限制了它们的进一步应用。在本文中,研究人员通过固相球磨策略构建了一种双导电结构,即在Na2.31Fe1.72(SO4)3颗粒上原位包覆无定形碳,并将其嵌入到KB导电碳网络(NFS/KB)中,从而有效提高了硫酸铁基颗粒的固有导电性和颗粒间的电子转移效率。作为 SIB 的阴极,NFS/KB 在 0.1 摄氏度条件下可提供 92 mAh g-1 的可逆容量,并且在大电流条件下具有稳定的循环稳定性(20 摄氏度条件下循环 500 次后保持率为 85%)。令人惊讶的是,作为 SIB 的阳极,NFS/KB 的速率性能(10 C 时 149 mAh g-1)优于硬碳。值得注意的是,将这种材料进一步应用于对称 SIB 也能取得良好的效果。这项工作通过低成本的碳改性方法有效提高了硫酸铁基材料在 SIB 中的性能,为低成本对称 SIB 提供了一种新方法。
Carbon Coated Fe‐Based Sulphate Nanoparticles within Continuous Conductive Network for Low‐Cost and High‐Performance Symmetrical Sodium‐Ion Batteries
Fe‐based sulfate materials have attracted much attention in the cathode of sodium‐ion batteries (SIBs) due to their low cost and high operating voltage, as well as possessing application prospects comparable to hard carbon in the anode based on Fe0/Fe2+/Fe3+ redox properties. However, the poor conductivity and the tendency to agglomerate have limited their further application. Herein, the study constructs a dual‐conductive structure that the Na2.31Fe1.72(SO4)3 particles with amorphous carbon in situ‐coated embedded in ketjen black (KB) conducting carbon networks (NFS/KB) via a solid phase ball‐milling strategy, which effectively enhanced inherent conductivity and electron transfer efficiency among particles of the Fe‐based sulphate. The NFS/KB can provide a reversible capacity of 92 mAh g−1 at 0.1 C and stable cycling stability at high current (85% retention after 500 cycles at 20 C) as cathode of SIBs. Surprisingly, as anode of SIBs, the NFS/KB delivers a rate performance (149 mAh g−1 at 10 C) that is superior to that of hard carbon. Notably, further application of the material to symmetric SIBs also achieves favorable results. This work effectively enhances the performance of Fe‐based sulphate materials in SIBs with a low‐cost carbon modification method, providing a new approach for the low‐cost symmetric SIBs.
期刊介绍:
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