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C60衍生的长程有序多孔碳用于锂离子和钠离子电池的负极材料

C60-derived long-range ordered porous carbon as anodes for lithium-ion and sodium-ion batteries

  • 摘要: 探索新型碳材料已成为开发锂离子电池(LIBs)和钠离子电池(SIBs)更高性能负极材料的一个重要研究课题。在本工作中,我们在~ 520 ℃和真空条件下,通过电子注入诱导面心立方C60(fcc C60)分子晶体中的相邻分子之间形成共价键,制备了一种新型碳材料—长程有序多孔碳(LOPC)。LOPC保持了fcc C60分子晶体的周期性晶格结构,同时由于C60分子之间形成了sp2共价键,结构稳定性和电子导电性得以提升。此外,LOPC的比表面积(327.1 m2·g−1)相比fcc C60分子晶体材料得到大幅提升,应用于LIBs或SIBs负极材料时,在0.1 A·g−1电流密度下展现出的质量比容量分别为820.9 mA·h·g−1或292.9 mA·h·g−1。这种多孔且有序的碳材料可能为电化学储能中的负极材料研究开辟新的机会。

     

    Abstract: The search for novel carbons has been an important research topic for developing high-performance anodes of lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). In this study, we fabricated a new carbon, long-range ordered porous carbon (LOPC), by inducing covalent bonds between face-centered cubic C60 (fcc C60) cages in a molecular crystal via electron injection under vacuum at ~ 520 °C. The LOPC maintains the periodic lattice of the fcc C60 molecular crystal but has improved structural stability and electrical conductivity because of the sp2 bonding formed between C60 molecules. Compared with fcc C60, which has a much greater specific surface area (327.1 m2·g−1), LOPC has a specific capacity of 820.9 mA·h·g−1 or 292.9 mA·h·g−1 as an anode for LIBs or SIBs, both of which are measured at a current density of 0.1 A·g−1. This porous yet ordered carbon may open new opportunities for anode materials in electrochemical energy storage.

     

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