Wang Jianming, Chen Lu, Zhao Bo, Liang Chunyong, Wang Hongshui, Zhang Yongguang
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Nanomaterials (Basel). 2023 Feb 20;13(4):777. doi: 10.3390/nano13040777.
Lithium-sulfur batteries (LSBs), with their high theoretical specific capacity and energy density, have great potential to be a candidate for secondary batteries in the future. However, Li-S batteries suffer from multiple issues and challenges, for example, uneven growth of lithium dendrites, low utilization of the active material (sulfur), and low specific capacity. This paper reports a low-cost and anodic oxidation method to produce niobium pentoxide with a porous structure (P-NbO). A simple one-step process was used to synthesize P-NbO with porous structures by anodizing niobium at 40 V in fluorinated glycerol. The porous NbO showed excellent rate capability and good capacity retention by maintaining its structural integrity, allowing us to determine the advantages of its porous structure. As a result of the highly porous structure, the sulfur was not only provided with adequate storage space and abundant adsorption points, but it was also utilized more effectively. The initial discharge capacity with the P-NbO cathode rose to 1106.8 mAh·g and dropped to 810.7 mAh·g after 100 cycles, which demonstrated the good cycling performance of the battery. This work demonstrated that the P-NbO prepared by the oxidation method has strong adsorption properties and good chemical affinity.
锂硫电池（LSBs）具有高理论比容量和能量密度，在未来作为二次电池的候选者具有巨大潜力。然而，锂硫电池存在多个问题和挑战，例如锂枝晶生长不均匀、活性材料（硫）利用率低以及比容量低。本文报道了一种低成本的阳极氧化法来制备具有多孔结构的五氧化二铌（P-NbO）。通过在氟化甘油中于40V电压下对铌进行阳极氧化，采用简单的一步法合成了具有多孔结构的P-NbO。多孔NbO通过保持其结构完整性表现出优异的倍率性能和良好的容量保持率，这使我们能够确定其多孔结构的优势。由于具有高度多孔的结构，硫不仅获得了充足的存储空间和丰富的吸附位点，而且得到了更有效的利用。使用P-NbO阴极时的初始放电容量升至1106.8 mAh·g，100次循环后降至810.7 mAh·g，这表明该电池具有良好的循环性能。这项工作表明，通过氧化法制备的P-NbO具有很强的吸附性能和良好的化学亲和力。
