镍催化石墨化提升纤维素碳材料的电化学性能

Nickel-catalysed graphitization to enhance the electrochemical properties of cellulosic carbon materials

  • 摘要: 纤维素碳材料因其来源丰富、成本低廉,活性位点丰富而在锂离子存储方面展现出良好的潜力。然而,还存在储锂电位高,导电性差等问题,这限制了其在实际中应用。本研究通过引入镍催化石墨化工艺,显著提升了纤维素碳材料的导电性,并展现出较低的储锂电位,高的嵌入机制比例。实验结果表明,该材料具有高的比容量、出色的倍率性能(在电流密度提升至5000 mA·g−1时,比容量仍保持在70.8 mAh·g−1)以及优异的循环稳定性(在1000 mA·g−1的电流密度下经过1000次循环后,容量依然高达228.0 mAh·g−1)。这一研究为开发高性能、可持续的锂离子电池负极材料提供了新的思路和重要参考。

     

    Abstract: Cellulosic carbon materials show good potential for lithium-ion storage due to their abundant sources, low cost, and abundance of active sites. However, there are also problems such as high lithium storage potentials and poor electrical conductivity, which limit their application in practice. In this study, the electrical conductivity of cellulosic carbon materials was significantly enhanced by introducing a nickel-catalysed graphitization process, and exhibited a low lithium storage potential and a high proportion of embedding mechanism. The experimental results show that the material possesses high specific capacity, excellent multiplicative performance (the specific capacity remains at 70.8 mAh·g−1 when the current density is increased to 5000 mA·g−1), and excellent cycling stability (the capacity remains as high as 70.8 mAh·g−1 after 1000 mA·g−1 at 1000 mA·g−1 current density after capacity remains high at 228.0 mAh·g−1 after 1000 cycles at a current density of 1000 mA·g−1). This study provides new ideas and important references for the development of high-performance and sustainable anode materials for lithium-ion batteries.

     

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