B,N共掺杂碳纳米管阵列锚定二氧化锰纳片作为水系锌离子电池的柔性阴极

B,N-codoped carbon nanotube array anchored with MnO2 nanosheets as flexible cathodes for aqueous Zinc-Ion batteries

  • 摘要: 对于可充电水系锌离子电池(ZIBs),由电化学活性材料和具有新颖结构的炭材料组成的纳米复合材料的分级设计在解决电化学循环过程中电极材料的电导率和结构稳定性问题方面具有巨大的应用前景。本文通过原位热解和水热生长策略制备了一种新型柔性电极材料,该材料将MnO2纳米片锚定在生长B,N共掺杂碳纳米管阵列(BNCNTs)的炭布上(BNCNTs@MnO2)。原位生成的BNCNT牢固地结合在炭布内的炭纤维表面,其中分级碳基底有利于电子传输和离子扩散,提高了正极的稳定性和耐久性。重要的是,BNCNT为MnO2的水热生长提供了更多的活性位点,确保了均匀分布和强亲和力。电化学测试表明,BNCNTs@MnO2 在0.1 A g−1时可提供310.7 mAh g−1的高比容量,同时具有出色的倍率性能和优异的循环稳定性,在3 A g−1下经过8000次循环后容量保持率为79.7%。这项工作为通过创建分级基底和表面改性来开发高性能水系ZIBs柔性复合电极提供了灵感。

     

    Abstract: For rechargeable aqueous zinc-ion batteries (ZIBs), the hierarchical design of nanocomposites comprising electrochemically active materials and carbon materials with novel structures holds great promise in addressing the issue of electrical conductivity, structural stability in the electrode materials during electrochemical cycling. Herein, a novel flexible electrode material by anchoring MnO2 nanosheets on B,N-codoped carbon nanotubes array (BNCNTs) grown on carbon cloth (BNCNTs@MnO2) is fabricated by in situ pyrolysis and hydrothermal growth strategies. The in situ generated BNCNTs are robustly bonded on the surface of carbon fibers within the carbon cloth, in which the hierarchical carbon substrate is conducive both to electron transport and ion diffusion, improving the stability and durability of the cathode. Importantly, the BNCNTs offer more active sites for the hydrothermal growth of MnO2, ensuring uniform distribution and strong affinity. Electrochemical tests reveal that BNCNTs@MnO2 delivers a high specific capacity of 310.7 mAh g−1 at 0.1 A g−1, along with excellent rate capability and outstanding cycling stability with 79.7% capacity retention after 8000 cycles at 3 A g−1. This work provides inspiration for developing flexible composite electrodes of aqueous ZIBs with high-performance through the creation of hierarchical substrates and surface modification.

     

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